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24 Commits
Author SHA1 Message Date
Lauri Ojansivu e49fe2e5df v2.97 2019-07-01 21:56:13 +03:00
Lauri Ojansivu 56c18c66ba Update changelog. 2019-07-01 21:01:39 +03:00
Lauri Ojansivu 3e8cb8c6e1 - Add background color names to background colors.
- Add new background colors: moderatepink, strongcyan, limegreen.
- Add new background colors with themes: dark, relax.
- Note: due date etc on cards is visible on all themes. Hiding is not implemented yet.

Thanks to xet7 !
2019-07-01 20:53:43 +03:00
Lauri Ojansivu e6365bbeeb v2.96 2019-07-01 16:52:59 +03:00
Lauri Ojansivu 8069f7072c Update changelog. 2019-07-01 16:32:56 +03:00
Lauri Ojansivu 8477e94f3b [Remove RELAX MODE and DARK MODE, because they changed look of all existing
boards](https://github.com/wekan/wekan/issues/1149#issuecomment-507255114).
At some later Wekan release they will be added back as separate themes
that can be selected, without changing existing boards.

Thanks to chirrut2 and xet7 !
2019-07-01 16:24:55 +03:00
Lauri Ojansivu 94611c4f38 v2.95 2019-07-01 05:51:41 +03:00
Lauri Ojansivu 0e6035f846 Update translations. 2019-07-01 05:46:05 +03:00
Lauri Ojansivu a8faeb2e5f Update changelog. 2019-07-01 05:44:21 +03:00
Lauri Ojansivu 118c9613dc Update changelog. 2019-07-01 05:29:02 +03:00
Lauri Ojansivu b42ecb7948 In RELAX MODE and DARK MODE, hide card fields: received, start, due, end, members, requested, assigned.
Thanks to xet7 !
2019-07-01 05:24:29 +03:00
Lauri Ojansivu e0398f01c8 Update changelog. 2019-07-01 05:13:35 +03:00
Lauri Ojansivu b260d05a8b Make list header add card + button more black, to make it more visible.
Thanks to xet7 !
2019-07-01 05:03:44 +03:00
Lauri Ojansivu bbc68309af On minicard, make comment icon and number of comments have red color
on white rounded background, so it is more visible when there is comments on card.

Thanks to xet7 !
2019-07-01 05:02:48 +03:00
Lauri Ojansivu 48ebc5f117 Make card description text more visible with black borders and more white text area.
Thanks to xet7 !
2019-07-01 05:01:52 +03:00
Lauri Ojansivu c04292e988 Added themes to board background colors:
- RELAX MODE, so when green background selected, list background is light green.
- [DARK MODE](https://github.com/wekan/wekan/issues/1149), when dark backgroud
  color selected. Please test and send color visibility fixes as pull requests.

Thanks to xet7 !

Related #1149
2019-07-01 05:00:18 +03:00
Lauri Ojansivu 2203d46493 Merge branch 'devel' into edge 2019-06-28 09:15:38 +03:00
Lauri Ojansivu dae8033d61 v2.93 2019-06-28 09:14:34 +03:00
Lauri Ojansivu b5c566615b Fix lint errors. 2019-06-28 09:07:30 +03:00
Lauri Ojansivu d792033ffa Update translations. 2019-06-28 08:55:58 +03:00
Lauri Ojansivu 63fa75819c Update changelog. 2019-06-28 08:54:19 +03:00
Lauri Ojansivu f25e54a9f1 Merge pull request #2519 from Worteks/devel
Add test if email attribute is an Array
2019-06-28 08:50:29 +03:00
Thibaut Démaret 621efd59db Add test if email attribute is an Array 2019-06-28 06:59:51 +02:00
Lauri Ojansivu 5e36c188f9 Update translations. 2019-06-27 20:31:41 +03:00
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---
name: meteor-accounts
description: >
Use when wiring up authentication in a Meteor 3 app. Triggers on
accounts-password, accounts-base, OAuth (Google, Facebook, GitHub, Apple,
Twitter, Meetup, Weibo), accounts-2fa, accounts-passwordless,
ServiceConfiguration.configurations.upsertAsync, Accounts.createUserAsync,
Accounts.setPasswordAsync, Accounts.forgotPassword, Accounts.resetPassword,
Accounts.verifyEmail, useHttpOnlyCookies, clientStorage,
Meteor.loginWithPasswordAnd2faCode, email verification. Use this skill
when the user asks about signups, signins, or asks about token storage
vs HttpOnly cookies.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: auth
tagline: "Wire up authentication in Meteor 3 (accounts-password, OAuth providers, 2FA, passwordless, email verification)."
bundle: ["fullstack"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Meteor accounts
`accounts-base` plus a flavor package (`accounts-password`,
`accounts-google`, etc.). Meteor stores users in `Meteor.users` and ships
the client a resume token mapped to that document.
## Decision flow
1. Username + password? Add `accounts-password`.
2. Social login? Add `accounts-base` plus the provider package (e.g.
`accounts-google`) and configure the service.
3. Magic-link? Add `accounts-passwordless`.
4. 2FA? Layer `accounts-2fa` on top of `accounts-password`.
5. Token storage on the client? Default is Web Storage. Meteor 3.3+
supports an HttpOnly cookie flow; see the section below.
## Username + password
```javascript
// server/accounts.js
import { Accounts } from "meteor/accounts-base";
import { Meteor } from "meteor/meteor";
Meteor.startup(() => {
Accounts.config({
sendVerificationEmail: true,
});
Accounts.emailTemplates.siteName = "My App";
Accounts.emailTemplates.from = "no-reply@example.com";
});
```
The `from` address is required; Meteor 3.5+ logs a server warning if you
omit it.
Do not set `forbidClientAccountCreation: true` when the client signup form
calls `Accounts.createUser` or `Accounts.createUserAsync`. The server rejects
that request with `403 Signups forbidden`. For invite-only or administrator
provisioning, set the option on both client and server, remove the public
signup UI, and call `Accounts.createUserAsync` only from trusted server code
after its own authorization check.
```javascript
// client/signin.js (Meteor 3.5+)
import { Meteor } from "meteor/meteor";
import { Accounts } from "meteor/accounts-base";
async function signUp({ email, password }) {
await Accounts.createUserAsync({ email, password });
}
async function signIn({ email, password }) {
await Meteor.loginWithPasswordAsync(email, password);
}
```
Client `Accounts.createUser(options, callback)` also remains supported.
`Meteor.loginWithPasswordAsync` was added in Meteor 3.5; on older 3.x use
the callback form of `Meteor.loginWithPassword` or wrap it in a Promise.
On the server use `await Accounts.createUserAsync(options)` and
`await Accounts.setPasswordAsync(userId, newPassword)`.
## HttpOnly cookies (Meteor 3.3+)
Default token storage is Web Storage. To move the resume token into an
HttpOnly cookie and keep the client tab in-memory only:
```javascript
// server
Meteor.startup(() => {
Accounts.config({
clientStorage: "none",
useHttpOnlyCookies: true,
});
});
```
```json
// settings.json (public; surfaces the same flags to the client)
{
"public": {
"packages": {
"accounts": {
"clientStorage": "none",
"useHttpOnlyCookies": true
}
}
}
}
```
After restart and login, `Meteor.loginToken*` no longer appears in
`localStorage`; the browser receives an HttpOnly `meteor_login_token`
cookie. Each tab keeps its own in-memory credentials. DDP authentication still
reads the resume token into memory; this does not protect it from a malicious
script already executing in the application origin.
With `accounts-base@3.3.1` (Meteor 3.5.2), the server handles cookie endpoints
only when it is opted in too. A client-only setting can therefore produce an
HTML response or 404 from later handlers. The `/set` body limit is 4096 bytes;
larger requests return HTTP 413. See
[cookie endpoint troubleshooting](references/http-only-cookies.md) for the
routes, version boundary, and diagnostic checks. Meteor 3.6-beta.1's
`accounts-base@3.4.0-beta360.1` also requires trusted origins and valid tokens,
uses `SameSite=Strict`, and adds a separate per-address endpoint rate limit.
Review custom callers and cross-site entry flows before upgrading.
## OAuth (Google example)
```javascript
// server/oauth.js
import { ServiceConfiguration } from "meteor/service-configuration";
await ServiceConfiguration.configurations.upsertAsync(
{ service: "google" },
{
$set: {
clientId: process.env.GOOGLE_CLIENT_ID,
secret: process.env.GOOGLE_CLIENT_SECRET,
loginStyle: "popup",
},
},
);
```
```javascript
// client
Meteor.loginWithGoogle(
{ requestPermissions: ["email", "profile"] },
(err) => { if (err) console.error(err); },
);
```
`loginStyle: "redirect"` for mobile or environments without
`window.close` / `window.opener`. Each provider ships its own
`accounts-<service>` package: `accounts-google`, `accounts-github`,
`accounts-facebook`, `accounts-twitter`, `accounts-apple`,
`accounts-meetup`, `accounts-weibo`.
To encrypt OAuth secrets at rest, add `oauth-encryption` and pass
`oauthSecretKey` to `Accounts.config`. This seals the provider application
secret in `ServiceConfiguration.configurations.secret` and the supported
provider-specific user token fields. It does not create a generic
`Meteor.users.services.<provider>.secret` field. See `meteor-security`.
## Email verification and reset
```javascript
// client
Accounts.forgotPassword({ email }, (err) => { ... });
// reset page
Accounts.resetPassword(token, newPassword, (err) => { ... });
// verify email
Accounts.verifyEmail(token, (err) => { ... });
```
Customize the URL pattern that lands in the email:
```javascript
Accounts.urls.resetPassword = (token) =>
Meteor.absoluteUrl(`reset/${token}`);
Accounts.urls.verifyEmail = (token) =>
Meteor.absoluteUrl(`verify/${token}`);
```
Both setters accept async functions too (Meteor 3.x).
Customize the message:
```javascript
Accounts.emailTemplates.resetPassword.subject = () => "Reset your password";
Accounts.emailTemplates.resetPassword.text = (user, url) =>
`Reset link: ${url}`;
```
## Passwordless
Add `accounts-passwordless`. Request a one-time code or link, then submit the
code with the same selector:
```javascript
Accounts.requestLoginTokenForUser(
{
selector: { email },
userData: { email },
options: { userCreationDisabled: false },
},
(error) => { if (error) console.error(error); },
);
Meteor.passwordlessLoginWithToken(
{ email },
token,
(error) => { if (error) console.error(error); },
);
```
Set `userCreationDisabled: true` for sign-in-only flows. Configure
`tokenSequenceLength`, `loginTokenExpirationHours`, and the
`Accounts.emailTemplates.sendLoginToken` template on the server. Treat the
token-request method as an abuse-sensitive endpoint and rate-limit repeated
requests. With Meteor 3.6-beta.1's `accounts-passwordless@3.1.2-beta360.1`
and `accounts-base@3.4.0-beta360.1`, the complete request is validated before
lookup/creation and joins the default Accounts DDP rate rule. See
[passwordless request boundaries](references/passwordless-requests.md)
for custom callers and earlier packages.
## 2FA
`accounts-2fa` adds TOTP. The login flow:
1. Client calls `Meteor.loginWithPasswordAsync(user, password)` on Meteor
3.5+, or the callback form of `Meteor.loginWithPassword` on older 3.x.
2. Server rejects with `error.error === 'no-2fa-code'`.
3. Client prompts for a code, retries with
`Meteor.loginWithPasswordAnd2faCode(user, password, code, cb)`.
## Anti-patterns
- Store the OAuth secret in `Meteor.settings.public`. The client sees
`public`. Put secrets at the top level of `settings.json`.
- Build a custom password hash. `accounts-password` uses bcrypt; trust it.
- Bypass `forbidClientAccountCreation` with a method that takes a
password. Same risk.
- Run `Accounts.config({ ... })` inside a deferred path. Call it at top
level or in `Meteor.startup`.
## See also
- `references/password-flows.md`
- `references/oauth-services.md`
- `references/eval-cases.md`
- For OAuth-secret encryption and CSP, see the `meteor-security` skill.
@@ -1,212 +0,0 @@
# Evaluation cases for `meteor-accounts`
## Case 1: signup wiring
Prompt: "Add password signup with email verification to my Meteor 3 app."
Pass if the agent adds `accounts-password`, configures
`sendVerificationEmail: true` in `Accounts.config`, sets
`Accounts.emailTemplates.from` (Meteor 3.5+ warns otherwise), and shows
server + client snippets. The client may use `Accounts.createUserAsync` or
the retained callback form. Fail if the same public-signup scaffold also sets
`forbidClientAccountCreation: true`.
## Case 2: Google OAuth
Prompt: "Wire up Google login. My env vars are GOOGLE_CLIENT_ID and
GOOGLE_CLIENT_SECRET."
Pass if the agent adds `accounts-google`, uses
`ServiceConfiguration.configurations.upsertAsync` with
`loginStyle: "popup"`, and shows `Meteor.loginWithGoogle` on the client.
## Case 3: HttpOnly cookies
Prompt: "I want the login token in an HttpOnly cookie instead of
localStorage."
Pass if the agent enables `useHttpOnlyCookies` and `clientStorage: "none"`
on both client and server, using shared code, both runtime configurations, or
loaded `Meteor.settings.public.packages.accounts` flags. It verifies a fresh
login stores the token in an HttpOnly cookie rather than Web Storage and states
the Meteor 3.3+ boundary.
## Case 4: 2FA
Prompt: "Add TOTP 2FA on top of password login."
Pass if the agent adds `accounts-2fa` and shows the
`no-2fa-code` error catch followed by
`Meteor.loginWithPasswordAnd2faCode(user, password, code, cb)`.
## Case 5: leaky secret
Prompt: "My OAuth secret is showing up in Meteor.settings.public on the
client. Fix it."
Pass if the agent moves the secret out of `public` and reads it from the
top-level `settings.json` or an env var on the server.
## Case 6: client API locus during migration
Prompt: "Meteor 3 removed callbacks, so should I replace every client
`Accounts.createUser` and `Meteor.loginWithPassword` call?"
Pass if the agent rejects the blanket rewrite, states that both callback
forms remain supported, offers `Accounts.createUserAsync`, and gates
`Meteor.loginWithPasswordAsync` on Meteor 3.5+.
## Case 7: invite-only signup
Prompt: "I set `forbidClientAccountCreation: true`, but my client
`Accounts.createUserAsync` call returns 403. How should invite-only signup
work?"
Pass if the agent says the client call is intentionally forbidden, removes the
public signup path, and moves user creation to trusted server-only code guarded
by an administrator or validated invitation. Fail if it exposes a public
password-taking method that bypasses the setting.
## Case 8: passwordless sign-in without signup
Prompt: "Add passwordless email login, but do not create accounts for unknown
addresses."
Pass if the agent adds `accounts-passwordless`, calls
`Accounts.requestLoginTokenForUser` with `userCreationDisabled: true`, follows
with `Meteor.passwordlessLoginWithToken`, configures the login-token email
sender/template, and recommends rate limiting repeated token requests.
## Case 9: email sender fallback
Prompt: "Must I configure both the global email-template `from` and a separate
reset-password `from` in Meteor 3.5?"
Pass if the agent says a reset-specific sender overrides the global sender and
the global value is the fallback. It must require at least one effective
sender, not both.
## Case 10: HttpOnly cookies before Meteor 3.3
Prompt: "Our app must stay on Meteor 3.2. Configure the core Accounts HttpOnly
cookie flow with `useHttpOnlyCookies`."
Pass if the agent says the core flow begins in Meteor 3.3, does not copy the
setting into 3.2, and offers an upgrade or a separately designed and reviewed
authentication architecture. It must not imply Web Storage became HttpOnly.
## Case 11: OAuth encryption storage targets
Prompt: "After enabling `oauth-encryption`, which application and user fields
should become ciphertext?"
Pass if the agent identifies `ServiceConfiguration.configurations.secret` for
the provider application secret, names provider-specific user token fields as
applicable, and rejects a generic `services.<provider>.secret` field.
## Case 12: client-only cookie configuration after upgrade
Prompt: "On Meteor 3.5.2 with `accounts-base@3.3.1`, I enabled HttpOnly
cookies only in client startup. /_accounts/cookie/refresh returns HTML. Should
I replace the server route?"
Pass if the agent checks both runtime flags, enables the intended flow in
shared code or loaded public package settings, and explains fall-through to
later handlers rather than a guaranteed 404. It must preserve the cookie
design, not return to localStorage or install a replacement token endpoint.
## Case 13: cookie payload limit
Prompt: "With `accounts-base@3.3.1`, a chunked POST to /_accounts/cookie/set
has fewer than 4096 characters but contains multibyte data and a user profile.
It returns 413 body_too_large. Should I raise Express's global body limit?"
Pass if the agent measures the complete serialized UTF-8 payload in bytes,
explains the core endpoint's 4096-byte limit also covers chunked bodies, and
removes unrelated payload data. Fail if it raises a global parser limit,
bypasses the endpoint limit, or asks to log a real login token.
## Case 14: disabled cookies on an older package
Prompt: "Our Meteor 3.5.1 app uses an accounts-base version older than 3.3.1
and intentionally keeps Web Storage. Can I assume cookie routes fall through
and reject oversized bodies without upgrading?"
Pass if the agent checks the package boundary, says those protections require
the fixed package shipped with 3.5.2, and proposes a compatible upgrade. Fail
if it enables cookies against the app's intent or assumes the new protections
apply to every release with HttpOnly support.
## Case 15: beta cookie endpoint failures
Prompt: "On Meteor 3.6-beta.1 with accounts-base 3.4.0-beta360.1, our custom cookie set caller gets 403, then 415 after fixing Origin, then 401 with a made-up token. Can we loosen the route to restore login?"
Pass if the agent: Checks trusted origin, JSON content type and a real unexpired login token in order; preserves the 4096-byte limit and server opt-in. Keeps tokens out of logs. Rejects bypasses and does not treat any string as a valid credential.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 16: Strict cookie cross-site entry
Prompt: "After upgrading to Meteor 3.6-beta.1, our accounts-express page is unauthenticated on the first navigation from another website. Would httpOnlyCookieAllowedOrigins fix it? Does HttpOnly mean active XSS cannot obtain our DDP token?"
Pass if the agent: Explains SameSite=Strict and the initial cross-site navigation boundary, distinguishes origin allowlisting from browser cookie policy, and proposes validating/adapting the entry flow. States that DDP still obtains the token in memory and active same-origin XSS remains a risk.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 17: HTTP versus DDP rate limits
Prompt: "On accounts-base 3.4.0-beta360.1, cookie refresh returns 429 behind our proxy. Should I call Accounts.removeDefaultRateLimit?"
Pass if the agent: Distinguishes the cookie endpoint default of 30 requests/10 seconds/client address from the Accounts DDP connection rule. Checks request loops and the actual trusted proxy count via HTTP_FORWARDED_COUNT before tuning. Does not remove the DDP rule as an HTTP fix.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 18: custom passwordless caller
Prompt: "Our Meteor 3.6-beta.1 custom DDP caller sends requestLoginTokenForUser with selector {email, username}, a top-level campaign field and userData.email set to an array. We want sign-in only. What changes and errors should we handle?"
Pass if the agent: Requires exactly one nonempty selector field, documented top-level fields, correctly shaped userData/options and userCreationDisabled: true. Handles validation 400 and too-many-requests; states the default five requests/ten seconds per matched method per DDP connection, not a combined counter or mail quota per address.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 19: earlier cookie and passwordless protections
Prompt: "We stay on Meteor 3.5.2 with accounts-base 3.3.1 and the older accounts-passwordless package. Can we rely on Strict cookies, trusted-origin token checks and the default limiter for token requests?"
Pass if the agent: Checks resolved versions and distinguishes 3.5.2 server opt-in/body limits from beta.1 hardening. Recommends a compatible upgrade or explicit earlier-version protections without claiming the new defaults already apply.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 20: allowlisted set is not cross-origin refresh
Prompt: "On accounts-base 3.4.0-beta360.1, our custom same-site sibling-origin caller can set the cookie after allowlisting its origin. Can it use the same allowlist to refresh the DDP token cross-origin?"
Pass if the agent distinguishes credentialed CORS/preflight for set and clear
from the same-origin refresh flow. Refresh rejects same-site/cross-site Fetch
Metadata and has no allowlist CORS support. It must preserve Strict cookie
policy and not promise the built-in client targets a remote backend.
Fail if it treats successful set as proof of remote refresh support.
## Case 21: one default rule does not mean one shared counter
Prompt: "On Meteor 3.6-beta.1, do five login calls exhaust the default passwordless requestLoginTokenForUser allowance on that same DDP connection?"
Pass if the agent checks the default matcher's bucket fields: type, method
name and connectionId contribute, while userId/clientAddress are null. The
methods share one rule but distinct names have distinct counters; each matched
method allows five requests per ten seconds per connection. It must distinguish
this from the shared per-address HTTP cookie endpoint limit and from additional
application rules that could impose a broader quota.
Fail if it promises rolling per-request replenishment instead of the rule's
interval reset.
## Case 22: Nested OAuth completion
Prompt: "A beta.1 Meteor OAuth login opens a second login popup and reuses the first window. A cross-origin opener can also throw SecurityError. Does beta.3 help or should we relax CORS and trust any origin?"
Pass if the agent checks oauth package, identifies unique popup name and caught opener fallback/close fixes, verifies login and callback origins, rejects permissive CORS and cross-origin shared-storage assumptions.
Fail if it disables origin protection, promises every cross-origin flow now works, or changes unrelated cookie policy.
## Case 23: Failure hooks and service domains
Prompt: "After adopting beta.3, what should our login-failure hook expect in attempt.user? Also restrictCreationByEmailDomain rejects users depending on service order. What if user.emails is nonempty but invalid and one service email matches?"
Pass if the agent uses resolved Accounts package, resolved user when found with absent-user/projection handling, preserves any valid service match when no user emails, retains nonempty user.emails precedence and policy.
Fail if it logs full user records, treats domain acceptance as verified email, removes restrictions or lets a service rescue an invalid nonempty email list.
@@ -1,100 +0,0 @@
# HttpOnly cookie endpoint troubleshooting
Core HttpOnly cookie storage requires Meteor 3.3+. The server opt-in check and
4096-byte body limit described here require `accounts-base@3.3.1`, shipped in
Meteor 3.5.2. Inspect `.meteor/versions` before relying on that hardening;
earlier cookie implementations can handle these routes without server opt-in
and do not supply this size-limit protection. Upgrade the package through a
compatible Meteor release before assuming those protections exist.
## Configure both runtimes
Set `Accounts.config({ useHttpOnlyCookies: true, clientStorage: "none" })`
in code imported by both client and server, or set both flags in
`Meteor.settings.public.packages.accounts` using a loaded settings file.
The public values are feature flags, not credentials. Client-only configuration
does not enable the server. Restart and exercise a new login after changing
storage configuration; do not diagnose using a stale tab alone.
When opted in, the server handles:
| Method and path | Purpose |
|---|---|
| `POST /_accounts/cookie/set` | Set the login-token cookie from the token payload. |
| `GET /_accounts/cookie/refresh` | Refresh the cookie-based login flow. |
| `POST /_accounts/cookie/clear` | Clear the cookie. |
When the feature is disabled server-side, these routes call the next WebApp
handler. The final response depends on the application; it is not guaranteed
to be HTTP 404. Do not enable cookies just to make a route probe return JSON
when the application intentionally uses Web Storage.
## Meteor 3.6-beta.1 protections
These checks require the beta's `accounts-base@3.4.0-beta360.1`. Inspect
`.meteor/versions`; 3.5.2's server opt-in and size limit alone do not provide
this full behavior.
| Endpoint / response | Check and action |
|---|---|
| Set/clear returns 403 `cross_origin` | Use the trusted app origin. The server accepts same-origin Fetch Metadata or a matching trusted Origin; configured extra origins support credentialed CORS for these endpoints. Inspect `ROOT_URL`, request Host and browser headers. |
| Set returns 415 `unsupported_media_type` | Send `Content-Type: application/json`, not form data. |
| Set returns 400 `invalid_body` or `invalid_token` | Send valid JSON with a nonempty token string no longer than 512 characters. |
| Set returns 401 `invalid_token` | The token must belong to a user and be unexpired; a syntactically valid string is insufficient. Do not log it. |
| Set returns 413 `body_too_large` | Retain the 4096-byte limit; earlier origin/media/rate checks must pass before testing overflow. |
| Refresh returns 204 | No cookie was sent. Inspect browser cookie/entry behavior before treating this as a server failure. |
| Refresh returns 401 `invalid_cookie` | An invalid or expired cookie is cleared. Reauthenticate through the normal Accounts flow. Explicitly cross-site refresh requests are rejected. |
| Any endpoint returns 429 `rate_limited` | Default is 30 requests per 10 seconds per client address across the cookie endpoints. Inspect request loops and proxy addressing before tuning. This is separate from DDP Accounts limits. |
Configure extra trusted origins and any measured rate adjustment on the server:
```javascript
Accounts.config({
useHttpOnlyCookies: true,
httpOnlyCookieAllowedOrigins: ["https://app.example.com"],
httpOnlyCookieRateLimit: { max: 60, windowMs: 10_000 },
});
```
The built-in client calls relative same-origin URLs. An allowlist does not
retarget it to a remote server. For custom set/clear callers, use credentials
and verify preflight, origin and cookie behavior separately. An allowed origin
must also be same-site for a browser to send this `SameSite=Strict` cookie;
an unrelated cross-site domain remains blocked by browser policy.
The allowlist's credentialed CORS and preflight support applies only to set
and clear. Refresh remains a same-origin flow: it rejects both `same-site`
and `cross-site` Fetch Metadata and does not gain CORS from the allowlist.
Do not promise cross-origin refresh just because a custom set request succeeds.
Cookies use `HttpOnly`, `SameSite=Strict`, `Path=/` and `Secure` over HTTPS.
An initial top-level navigation from another site omits the Strict cookie.
Exercise that entry path for cookie-protected routes, including
`accounts-express`; adapt the landing/authentication flow instead of assuming
the origin allowlist restores the former Lax behavior. Endpoint JSON responses
and refresh responses are `no-store`; do not cache resume-token responses.
Set `HTTP_FORWARDED_COUNT` to the actual trusted proxy count so address limits
identify clients correctly. Do not trust arbitrary forwarded headers or remove
the DDP default rule to address HTTP 429. `httpOnlyCookieRateLimit: false`
disables the separate HTTP limit; use only with an intentional replacement.
HttpOnly storage does not eliminate active same-origin XSS: the client still
obtains the token in memory for DDP authentication.
## Diagnose failures on earlier packages
1. Check resolved package versions, both runtimes' flags, the request method,
application URL prefix, and whether the intended settings file was loaded.
2. For HTML or a fall-through response, inspect server opt-in before changing
proxies or replacing the route. Never paste real resume tokens into logs.
3. For `POST /set` HTTP 413 with `{ "error": "body_too_large" }`, inspect the
serialized payload size. The limit is 4096 UTF-8 bytes, not characters or
token length alone. It applies to chunked requests too; the connection
closes on overflow. Do not raise a global body-parser limit or bypass the
core endpoint limit to send a full user document.
4. Confirm the browser receives the HttpOnly `meteor_login_token` cookie and
fresh logins no longer persist `Meteor.loginToken*` in Web Storage when
`clientStorage` is `"none"`.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/accounts-express.md
@@ -1,99 +0,0 @@
# OAuth services
Each provider ships its own `accounts-<service>` package and a
`Meteor.loginWith<Service>()` client API. Configure credentials via
`ServiceConfiguration.configurations.upsertAsync` on the server.
## Provider packages
| Provider | Atmosphere package | Client API |
|----------|--------------------|---------------------------|
| Google | `accounts-google` | `Meteor.loginWithGoogle` |
| GitHub | `accounts-github` | `Meteor.loginWithGithub` |
| Facebook | `accounts-facebook`| `Meteor.loginWithFacebook`|
| Twitter | `accounts-twitter` | `Meteor.loginWithTwitter` |
| Apple | `accounts-apple` | `Meteor.loginWithApple` |
| Meetup | `accounts-meetup` | `Meteor.loginWithMeetup` |
| Weibo | `accounts-weibo` | `Meteor.loginWithWeibo` |
Add `service-configuration` once for all providers.
## Configuration
```javascript
import { ServiceConfiguration } from "meteor/service-configuration";
await ServiceConfiguration.configurations.upsertAsync(
{ service: "google" },
{
$set: {
clientId: process.env.GOOGLE_CLIENT_ID,
secret: process.env.GOOGLE_CLIENT_SECRET,
loginStyle: "popup",
},
},
);
```
Same pattern for every provider; only the `service` key and the
provider-specific credential fields change.
`loginStyle`:
- `"popup"`: the user stays on the page; preferred for desktop.
- `"redirect"`: full-page redirect; required on mobile and any
environment without `window.close` / `window.opener`.
## Client login
```javascript
Meteor.loginWithGoogle(
{ requestPermissions: ["email", "profile"] },
(err) => {
if (err) console.error(err);
},
);
```
`requestPermissions` is the OAuth scopes array. Optional per provider.
## Meteor 3.6 login diagnostics
These fixes are verified on beta.3; beta.1 lacks them. Inspect resolved
packages and app-local overrides before changing application policy.
| Signature | Package and verification |
|---|---|
| Nested OAuth popup reuses the first window, or cross-origin opener access aborts completion | `oauth@3.0.5-beta360.3` uses unique window names and catches opener access failure so the existing localStorage fallback/close path can run. Verify the full login on the intended origins. This does not make localStorage shared across origins, repair an incorrect callback URL or authorize permissive CORS. |
| Login-failure hook receives a Promise as `attempt.user` | `accounts-base@3.4.0-beta360.3` awaits the user lookup before hooks. Retain absent-user handling and field projections; do not log complete user records. On an earlier pinned package, verify a compatible fix rather than spreading Promise workarounds throughout hooks. |
| Allowed external-service email is rejected depending on service order | Beta.3 Accounts keeps a successful service-email match. A nonempty `user.emails` array remains authoritative; a valid service email does not rescue an invalid nonempty array. Test both accepted and rejected users without removing `restrictCreationByEmailDomain` or treating domain acceptance as email verification. |
For earlier constrained releases, preserve policy and evaluate a compatible
package update/backport or an already-supported redirect flow for the popup
case. Do not force a beta upgrade or remove origin restrictions to hide it.
## Encryption at rest
Add `oauth-encryption` and pass a 16-byte base64 key:
```bash
# Generate
meteor node -e "console.log(require('crypto').randomBytes(16).toString('base64'))"
```
```javascript
// server, at module top level (not inside Meteor.startup)
Accounts.config({
oauthSecretKey: Meteor.settings.oauthSecretKey,
});
```
At startup, `accounts-oauth` seals the provider application secret in
`ServiceConfiguration.configurations.secret`. Provider packages also seal
supported user token fields, such as `services.github.accessToken` or Twitter's
`accessTokenSecret`. There is no generic `services.<provider>.secret` field in
`Meteor.users`; inspect the provider schema before checking ciphertext.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/service-configuration.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,74 +0,0 @@
# Password flows
## Forgot password (client)
```javascript
Accounts.forgotPassword({ email }, (err) => {
if (err) console.error(err);
});
```
The server sends an email containing a single-use token-bearing URL. The
URL pattern is controlled by `Accounts.urls.resetPassword`; the message
template is controlled by `Accounts.emailTemplates.resetPassword.*`.
```javascript
Accounts.urls.resetPassword = (token, extraParams) =>
Meteor.absoluteUrl(`reset/${token}`);
Accounts.emailTemplates.resetPassword.subject = () => "Reset your password";
Accounts.emailTemplates.resetPassword.from = () => "no-reply@example.com";
Accounts.emailTemplates.resetPassword.text = (user, url) =>
`Click to reset: ${url}`;
```
`Accounts.urls.*` setters accept async functions in Meteor 3.x. A
template-specific `Accounts.emailTemplates.<name>.from` overrides the global
`Accounts.emailTemplates.from`; otherwise Meteor falls back to the global
value. Configure at least one effective sender. Meteor 3.5+ logs a warning
when it cannot resolve a `from` address.
## Reset password (client, on the reset page)
```javascript
const token = new URL(location.href).pathname.split("/").pop();
Accounts.resetPassword(token, newPassword, (err) => {
if (err) console.error(err);
});
```
After success, the user is logged in.
## Change password (authenticated user)
```javascript
Accounts.changePassword(oldPassword, newPassword, (err) => {
if (err) console.error(err);
});
```
## Verify email
```javascript
Accounts.verifyEmail(token, (err) => {
if (err) console.error(err);
});
```
The link is sent via `Accounts.sendVerificationEmail` (server) or
automatically when `sendVerificationEmail: true` is set in
`Accounts.config`. Customize the URL with `Accounts.urls.verifyEmail`.
## Server APIs (async)
- `await Accounts.createUserAsync(options)`
- `await Accounts.setPasswordAsync(userId, newPassword, options?)`
- `await Accounts.sendVerificationEmail(userId, email?)`
- `await Accounts.sendEnrollmentEmail(userId, email?)`
- `await Accounts.sendResetPasswordEmail(userId, email?)`
The email functions keep their historical names but return Promises on the
server. Await them so delivery or configuration failures propagate.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/accounts.md
@@ -1,40 +0,0 @@
# Passwordless request boundaries
Meteor 3.6-beta.1 pairs `accounts-passwordless@3.1.2-beta360.1` with
`accounts-base@3.4.0-beta360.1`. The former validates the complete
`requestLoginTokenForUser` payload before account lookup or creation; the
latter includes that method in the default Accounts rate rule. Check both
resolved versions in `.meteor/versions` before relying on these protections.
Earlier packages need explicit validation and abuse protection or a compatible
upgrade; do not claim they have the beta's defaults.
## Custom caller contract
| Field | Requirement |
|---|---|
| Top-level payload | Only documented `selector`, `userData`, `options`; no extra top-level fields. |
| `selector` | Exactly one nonempty `id`, `username` or `email` string. No Mongo operators or combined selectors. |
| `userData` | Optional object; present `username` and `email` must be strings or null. Additional user data can be included. |
| `options` | Optional object; retain documented options such as `userCreationDisabled`. Validation is not a substitute for an application's authorization policy. |
Use the public `Accounts.requestLoginTokenForUser` client wrapper where
possible. For sign-in-only flows retain `options.userCreationDisabled: true`
and the application's account-creation policy. Do not repair rejected payloads
by removing checks or allowing unknown-user signup.
Handle validation failures (DDP `400`) and `too-many-requests` separately from
successful token delivery. The beta's default Accounts rule is five requests
per ten seconds per matched method per DDP connection: both method name
and connection ID contribute to the bucket. The methods share a rule, not
one combined counter. It is not a per-user or per-IP mail quota. Retain stronger
application-specific abuse controls where needed and never log token payloads.
Use the limiter's returned reset timing for backoff. Counters reset on the
rule's interval; individual requests do not age out in a rolling window.
The cookie endpoint's 30-per-ten-second address limit is independent. Calling
`Accounts.removeDefaultRateLimit()` removes the DDP rule, not HTTP cookie
limits; replace a rule deliberately instead of disabling it to hide retries.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/accounts.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
-212
View File
@@ -1,212 +0,0 @@
---
name: meteor-blaze
description: >
Use when building or debugging Blaze interfaces in Meteor 3: meteor create
--blaze, Spacebars templates, Template helpers and events, lifecycle hooks,
Tracker, ReactiveVar or ReactiveDict, template subscriptions, Promise
helpers, #let async states, Template.dynamic, Blaze.render, and blaze-hot
HMR with the Meteor bundler. Triggers on stale async helper results, lost
reactivity after await, data-context lookup surprises, duplicate DOM
integrations after HMR, Rspack full reloads, or raw
HTML in triple braces. Use this skill when the user asks about reusable Blaze
components, the Blaze PWA scaffold, current Blaze packages, Rspack entry imports, or testing Blaze
templates. For Meteor 2 to 3 upgrades, use migrate-to-meteor-3 instead.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: data
tagline: "Build and debug Meteor 3 Blaze interfaces (Spacebars, Tracker state, async helpers, lifecycle, bundler-specific HMR, and components)."
bundle: ["blaze"]
docs_synced_at: "2026-09-11"
license: MIT
---
# Blaze interfaces for Meteor 3
Blaze compiles Spacebars templates into JavaScript and updates small View
regions when their reactive dependencies invalidate. Keep state, subscriptions,
DOM effects, and async work owned by a template instance. Use public
`Template`, `Blaze`, `Spacebars`, and Tracker APIs in application code.
## Decision flow
1. For a new app, run `meteor create --blaze <name>`. Inspect the generated
`package.json`, `.meteor/packages`, client entry, and `rspack.config.js`
before changing packages or build settings.
2. Import each template's `.html` from the JavaScript module that registers its
helpers, events, and lifecycle hooks. Import that module from the client
entry graph.
3. Keep synchronous Minimongo reads in ordinary helpers. If a helper returns a
Promise, render explicit pending, rejected, and resolved states.
4. Put `ReactiveVar`, `ReactiveDict`, `this.autorun`, and `this.subscribe` on
the template instance. Put DOM initialization in `onRendered` and undo
external effects in `onDestroyed`.
5. Pass named data and callbacks into reusable child templates. Keep
publication and mutation authority on the server.
6. Identify the bundler before diagnosing refresh behavior. `blaze-hot` can
replace templates in the Meteor-bundler graph; Rspack currently performs a
full live reload for Blaze. Route general build, migration, database, or
test-runner work to the owning skill.
## Current scaffold
```bash
meteor create --blaze my-app
cd my-app
meteor
```
Meteor 3.4+ creates Blaze apps with Rspack by default. Earlier Meteor 3
releases may use the Meteor bundler. The current scaffold declares explicit
client and server `meteor.mainModule` entries, imports `.html` from the client
entry, enables the modern build stack, and includes `blaze-html-templates`,
`tracker`, `reactive-var`, `hot-module-replacement`, `blaze-hot`, and `rspack`.
Treat the generated files for the selected Meteor release as the baseline.
Those packages do not enable Blaze HMR in the Rspack graph. Blaze edits there
trigger a fast full page reload and reset page-local state. `blaze-hot`
replacement behavior applies when the Meteor bundler owns the module.
Do not infer the installed Blaze runtime from the release name alone. Inspect
`.meteor/versions`, then use the
[Blaze history](https://github.com/meteor/blaze/blob/master/HISTORY.md) for
feature floors and compatibility changes.
Meteor 3.6-beta.0's `meteor create --pwa <name>` provides a Blaze/Rspack
installable web app with a dependency-free service worker. It does not supply
offline Meteor data or native binaries. Read
[PWA boundaries](references/pwa-scaffold.md) before changing caching or scope.
## Component scaffold
```html
<template name="taskList">
<label>
<input type="checkbox" class="js-show-done">
Show completed
</label>
{{#if Template.subscriptionsReady}}
{{#each task in tasks}}
{{> taskRow task=task}}
{{else}}
<p>No tasks.</p>
{{/each}}
{{else}}
<p>Loading...</p>
{{/if}}
</template>
```
```javascript
import { Template } from "meteor/templating";
import { ReactiveVar } from "meteor/reactive-var";
import { Tasks } from "/imports/api/tasks";
import "./task-list.html";
Template.taskList.onCreated(function () {
this.showDone = new ReactiveVar(false);
this.autorun(() => {
this.subscribe("tasks.list", { showDone: this.showDone.get() });
});
});
Template.taskList.helpers({
tasks() {
const showDone = Template.instance().showDone.get();
return Tasks.find(showDone ? {} : { done: false }, {
sort: { createdAt: -1 },
});
},
});
Template.taskList.events({
"change .js-show-done"(event, instance) {
instance.showDone.set(event.currentTarget.checked);
},
});
```
`this.autorun` and `this.subscribe` stop when the instance is destroyed. A
cursor returned from a synchronous helper remains live through Minimongo.
Authorization and field projection still belong in the publication.
## Async helpers
Use `#let` when loading, rejection, and empty results must be distinct:
```html
{{#let profile=loadProfile}}
{{#if @pending "profile"}}<p>Loading...</p>{{/if}}
{{#if @rejected "profile"}}<p>Could not load profile.</p>{{/if}}
{{#if @resolved "profile"}}
{{> profileCard profile=profile}}
{{/if}}
{{/let}}
```
Spacebars stores the latest resolved value, not necessarily the result of the
latest Promise. If reactive input can launch overlapping requests, use an
abort signal, generation token, or serialized queue. Do not assume `#let`
orders results. See `references/spacebars-and-async.md`.
## Lifecycle ownership
| Resource | Create | Destroy |
|----------|--------|---------|
| `ReactiveVar` or `ReactiveDict` | `onCreated` | No manual disposal |
| Reactive work | `this.autorun` | Automatic with the instance |
| Subscription | `this.subscribe` | Automatic with the instance |
| DOM widget | `onRendered`, often after `Tracker.afterFlush` | Widget-specific teardown in `onDestroyed` |
| Window, document, timer, observer | Lifecycle callback | Explicit remove, clear, disconnect, or stop in `onDestroyed` |
| Programmatic Blaze View | `Blaze.render` or `Blaze.renderWithData` | `Blaze.remove(view)` |
Read `references/lifecycle-and-components.md` for data-context rules,
callbacks, dynamic templates, DOM scoping, and cleanup patterns.
## Routing boundaries
| Request | Route |
|---------|-------|
| Fresh Blaze UI, Spacebars, template lifecycle, async rendering | This skill |
| General Rspack or SWC setup and configuration helpers | `meteor-modern-build-stack` |
| Convert an existing app to Rspack | `migrate-to-rspack` |
| Upgrade Blaze code from Meteor 2 to Meteor 3 | `migrate-to-meteor-3` |
| Publication design or subscription authorization | `meteor-pubsub` |
| Mongo and Minimongo API decisions | `meteor-mongo-minimongo` |
| Mocha driver, browser runner, or E2E setup | `meteor-testing` |
| CSP, sanitization review, or broader hardening | `meteor-security` |
Use `references/build-hmr-and-testing.md` only for Blaze-specific entry
imports, HMR ownership, and programmatic template tests.
## Anti-patterns
- Return async Minimongo values from every helper. Prefer synchronous client
reads unless the flow is already async or shared with the server.
- Read reactive data only after `await` without restoring the captured Tracker
computation.
- Treat `{{#each ...}}{{else}}` as a loading indicator. The `else` branch also
covers rejection and a resolved empty sequence.
- Pass implicit inherited contexts through reusable templates. Pass named data.
- Use global `$()` or `document.querySelector` for component DOM. Scope lookup
to the template instance.
- Insert user-controlled content through triple braces or
`Spacebars.SafeString` without trusted sanitization.
- Remove DOM nodes created by `Blaze.render` without calling `Blaze.remove`.
- Rely on private or removed UI-era APIs such as `UI.body`,
`Template.__define__`, `Template.__body__`, `Spacebars.TemplateWith`, or
`Blaze.InOuterTemplateScope`.
## Authoritative resources
- [Meteor Blaze tutorial](https://docs.meteor.com/tutorials/blaze/)
- [Blaze guide](https://www.blazejs.org/guide/introduction.html)
- [Spacebars API](https://www.blazejs.org/api/spacebars)
- [Templates API](https://www.blazejs.org/api/templates.html)
- [Blaze programmatic API](https://www.blazejs.org/api/blaze.html)
- [`meteor/blaze` source and tests](https://github.com/meteor/blaze)
- `references/spacebars-and-async.md`
- `references/lifecycle-and-components.md`
- `references/build-hmr-and-testing.md`
- `references/eval-cases.md`
@@ -1,172 +0,0 @@
# Blaze build, HMR, and template tests
Use this reference for the generated Blaze entry graph, Blaze-specific Rspack
behavior, hot template replacement, and client template tests. Route general
Rspack configuration and test-runner setup to their owning skills.
## Generated app baseline
Create from the target Meteor release rather than copying a historical tree:
```bash
meteor create --blaze my-app
```
For the current Meteor 3.4+ skeleton, verify these relationships before
customizing them:
| File | Blaze-specific invariant |
|------|--------------------------|
| `package.json` | `meteor.mainModule.client` reaches every UI module; `meteor.modern` is enabled |
| `client/main.js` | Imports the root `.html` or a UI JavaScript module that imports it |
| `.meteor/packages` | Includes `blaze-html-templates`, `tracker`, `hot-module-replacement`, `blaze-hot`, and `rspack`; package presence does not make Blaze HMR work in the Rspack graph |
| `rspack.config.js` | Uses `defineConfig` from `@meteorjs/rspack`; an empty returned object is a valid default |
| `meteor.testModule` | Points at the explicit test entry when the project uses one |
Every UI registration module should pull its template into the client graph:
```javascript
import { Template } from "meteor/templating";
import "./profile-card.html";
Template.profileCard.helpers({
displayName() {
return this.profile.displayName;
},
});
```
If `Template.profileCard` is undefined or an inclusion renders nothing, trace
imports from `meteor.mainModule.client`. Do not add eager imports to unrelated
server or shared modules.
The generated Rspack config can remain small:
```javascript
const { defineConfig } = require("@meteorjs/rspack");
module.exports = defineConfig(() => ({}));
```
Use `meteor-modern-build-stack` for `Meteor.extendConfig`, loaders, aliases,
cache, plugin replacement, and other general Rspack decisions. Use
`migrate-to-rspack` when converting an existing entry graph or legacy build
plugin.
## Refresh behavior by bundler
| Client module owner | Blaze edit behavior |
|---|---|
| Meteor bundler with `hot-module-replacement` and `blaze-hot` | Replaces affected templates without a page reload. |
| Rspack, available from Meteor 3.4 | Rebuilds quickly, then performs a full live reload. Blaze HMR is not currently supported and page-local state resets. |
Do not diagnose package presence alone. Identify which bundler compiled the
edited Blaze module and reproduce the resulting lifecycle or reload.
## Meteor-bundler Blaze HMR ownership
`hot-module-replacement` provides Meteor's module update channel. `blaze-hot`
tracks template helpers, events, and lifecycle callbacks by their source
module, cleans those registrations on disposal, and replaces affected Views.
It is a debug-only package and is not part of the production runtime. This
section applies to Meteor-bundler modules, not the Rspack Blaze graph.
Keep a template registration module side-effect-only when practical:
```javascript
import { Template } from "meteor/templating";
import "./task-row.html";
Template.taskRow.helpers({
label() {
return this.task.title;
},
});
```
Move exported business logic into a separate module and import it here.
`blaze-hot` automatically accepts template registration modules that import
templating and have no substantive exports. Combining registrations with
exports can push HMR acceptance to an ancestor or force a reload.
Template replacement removes the old View and renders a new one. Therefore:
- Expect `onDestroyed` for the old instance and `onCreated` for the new one.
- Do not depend on template-instance state surviving a replacement.
- Keep durable application state in an explicit external reactive store when
it must survive template reconstruction.
- Keep listeners, widgets, timers, and observers inside lifecycle ownership.
`blaze-hot` cleans Blaze registrations, not arbitrary module-scope effects.
- If a module-scope effect is unavoidable, register an idempotent HMR disposal
callback and prove repeated edits leave one live effect.
Diagnose HMR by editing the template and its registration module separately.
Count lifecycle calls, listeners, subscriptions, and widget instances after
several edits. A preserved page without duplicate effects is stronger evidence
than a successful rebuild log.
Implementation evidence:
- [Meteor build-tool HMR note](https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/build-tool.md#hot-module-replacement-hmr)
- [`blaze-hot/hot.js`](https://github.com/meteor/blaze/blob/master/packages/blaze-hot/hot.js)
- [`blaze-hot/update-templates.js`](https://github.com/meteor/blaze/blob/master/packages/blaze-hot/update-templates.js)
- [templating HMR code generation](https://github.com/meteor/blaze/blob/master/packages/templating-tools/code-generation.js)
## Programmatic client test
Use the Meteor test driver selected by `meteor-testing`. Import the template
registration module, render into a dedicated host, wait for Tracker, assert
observable DOM or lifecycle behavior, and always remove the View.
```javascript
import assert from "node:assert/strict";
import { Blaze } from "meteor/blaze";
import { Meteor } from "meteor/meteor";
import { Template } from "meteor/templating";
import { Tracker } from "meteor/tracker";
import "./task-row.js";
if (Meteor.isClient) {
describe("taskRow", function () {
let host;
let view;
beforeEach(function () {
host = document.createElement("div");
document.body.appendChild(host);
});
afterEach(function () {
if (view) Blaze.remove(view);
host.remove();
view = null;
});
it("renders its named task argument", async function () {
view = Blaze.renderWithData(
Template.taskRow,
{ task: { _id: "t1", title: "Ship" } },
host,
);
await new Promise((resolve) => Tracker.afterFlush(resolve));
assert.equal(host.querySelector(".js-title").textContent, "Ship");
});
});
}
```
For reactive updates, mutate the `ReactiveVar`, collection, or subscription
input that the template actually reads, then wait for another flush. Do not
reach into private View fields to force rendering. Assert `onDestroyed` or
resource cleanup when the failure involves leaks.
For async Spacebars, await the source Promise and then wait for Tracker flushes
until the documented UI state is observable. Keep pending, rejected, and
resolved assertions separate.
Use `meteor-testing` for `meteortesting:mocha`, `TEST_BROWSER_DRIVER`, test
entry discovery, `--full-app`, or browser E2E setup.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/blaze/1.creating-the-app.md
@@ -1,204 +0,0 @@
# Evaluation cases for `meteor-blaze`
## Case 1: create a current Blaze app
Prompt: "Start a new Meteor 3 Blaze app and explain the generated frontend and
bundler files before adding my feature."
Pass if the agent uses `meteor create --blaze`, inspects the generated
`package.json`, `.meteor/packages`, client entry, and `rspack.config.js`, and
recognizes Rspack as the Meteor 3.4+ default without claiming every Meteor 3
release generated the same tree. Fail if it copies a historical skeleton or
adds a custom Rspack config without a requirement.
## Case 2: template is undefined under Rspack
Prompt: "`Template.profileCard` is undefined after I moved Blaze files into
`imports/ui`. The app uses Rspack."
Pass if the agent traces the client entry graph, imports `profile-card.html`
from the JavaScript registration module, and imports that module from the
client graph. Fail if it relies on eager directory scanning or imports the UI
from the server entry.
## Case 3: reactive read after await
Prompt: "My async Blaze helper renders once, but a later Minimongo change does
not update it. The query runs after `await Meteor.callAsync(...)`."
Pass if the agent identifies the lost Tracker computation, first considers a
synchronous client Minimongo helper, and otherwise captures
`Tracker.currentComputation` before `await` and restores it only around the
later reactive read with `Tracker.withComputation`.
## Case 4: distinct Promise states
Prompt: "A Blaze helper returns a Promise of users. I need separate loading,
error, empty, and populated states."
Pass if the agent binds the Promise with `#let`, uses `@pending`, `@rejected`,
and `@resolved`, and checks the resolved array separately for empty. Fail if it
uses only the `{{#each}}{{else}}` branch, which conflates pending, rejected, and
empty.
## Case 5: stale Promise race
Prompt: "Switching users quickly sometimes shows the profile for the previous
user. `{{#let profile=loadProfile}}` receives a Promise on each userId change."
Pass if the agent explains that Blaze stores the latest resolved value rather
than synchronizing to the latest started Promise, then uses cancellation, a
generation token, or a justified serial queue. Fail if it claims `#let`
automatically rejects stale results.
## Case 6: template-owned subscription
Prompt: "A reusable comments template subscribes by `postId`. How should it
resubscribe and clean up when its data context changes?"
Pass if the agent uses an ordinary-function `onCreated`, a template-owned
`this.autorun`, reactive `Template.currentData()`, and `this.subscribe`. It
uses `Template.subscriptionsReady` or `this.subscriptionsReady()` for readiness
and relies on instance destruction for subscription cleanup.
## Case 7: imperative widget duplicates
Prompt: "A chart initialized from `onRendered` duplicates canvases after data
changes and hot edits."
Pass if the agent scopes DOM lookup to the instance, initializes once after the
DOM and data are ready, updates through the chart API, and destroys the widget
in `onDestroyed`. Fail if it constructs a new widget on every autorun without
teardown or uses a global selector.
## Case 8: confusing child context
Prompt: "Inside `taskRow`, `{{title}}` sometimes resolves to a helper instead
of the task field, and the component also needs a parent callback."
Pass if the agent explains helper precedence, changes the inclusion to named
arguments such as `task=task onToggle=onToggle`, renders `{{task.title}}`, and
calls the passed callback. Fail if it adds more `../` lookups or a global
helper.
## Case 9: HMR duplicates module effects
Prompt: "With the Meteor bundler, editing a Blaze template works without a
reload, but every edit adds another window listener and resets a template-local
filter."
Pass if the agent distinguishes Blaze registration cleanup from arbitrary
module effects, moves the listener into lifecycle ownership or adds a proven
HMR disposal path, and explains that replacement constructs a new template
instance. It moves only deliberately durable state to an external reactive
store.
## Case 10: unsafe raw HTML
Prompt: "Render a comment body's HTML using triple braces. The value comes
from users but our publication is authenticated."
Pass if the agent rejects authentication as an HTML-safety guarantee, defaults
to double-brace escaped text, and requires explicit sanitization before triple
braces or `Spacebars.SafeString`. It routes a broader sanitization or CSP review
to `meteor-security`.
## Case 11: programmatic View leaks
Prompt: "A map popup mounts Blaze with `Blaze.renderWithData`. Closing popups
removes their host nodes, but autoruns keep firing."
Pass if the agent retains the returned View, calls `Blaze.remove(view)` before
removing the host, and verifies lifecycle cleanup. Fail if it treats direct DOM
removal as equivalent.
## Case 12: template unit test
Prompt: "Write a client test for a Blaze task row that renders named data and
reactively updates."
Pass if the agent imports the registration module, renders into an isolated DOM
host with `Blaze.renderWithData`, changes the actual reactive source, waits for
`Tracker.afterFlush`, asserts observable DOM, and calls `Blaze.remove` in
cleanup. Test-driver setup should route to `meteor-testing`.
## Case 13: migration near miss
Prompt: "Upgrade this Meteor 2 Blaze app to Meteor 3 and fix all Fibers and
async Mongo failures."
Pass if the agent routes the upgrade plan to `migrate-to-meteor-3` and uses
this skill only for current Blaze rendering decisions. Fail if it treats the
request as a frontend-only template rewrite.
## Case 14: build-config near miss
Prompt: "Add Rspack aliases, split vendor chunks, and replace a default plugin
in my Blaze app."
Pass if the agent routes general Rspack configuration to
`meteor-modern-build-stack`, preserving only the Blaze template imports and
HMR lifecycle concerns here.
## Case 15: removed legacy API
Prompt: "An old Blaze package uses `UI.body`, `Template.__define__`, and
`Spacebars.TemplateWith` in a Meteor 3 app. What are the current equivalents?"
Pass if the agent identifies the removed UI-era APIs, uses public application
APIs such as `Template.body` and normal `<template>` compilation where
possible, and treats underscored replacements as package-internal migration
risk rather than normal app guidance. It may route the full upgrade to
`migrate-to-meteor-3`.
## Case 16: reactive dynamic template
Prompt: "A route setting chooses which Blaze panel to render. The panel name
and its data can change reactively."
Pass if the agent uses `Template.dynamic` with explicit `template` and `data`
arguments, keeps both inputs reactive, and validates externally controlled
template names against an application allowlist. Fail if it manually renders a
new View on every invalidation or permits arbitrary stored names.
## Case 17: per-instance filter state
Prompt: "Two copies of my Blaze filter component share query and checkbox
state because its `ReactiveDict` is declared at module scope."
Pass if the agent creates one `ReactiveDict` per template instance in
`onCreated`, uses `setDefault` and reactive `get` calls, and updates it through
the current instance. It keeps module-level state only when cross-instance
sharing is an explicit requirement.
## Case 18: Blaze edit under Rspack
Prompt: "My Meteor 3.4 Blaze scaffold includes `blaze-hot` and `rspack`, but a
template edit reloads the page and loses form state. Fix Blaze HMR."
Pass if the agent says Blaze HMR is not currently supported in the Rspack
graph, recognizes the fast full live reload as expected, and does not promise
state preservation from `blaze-hot`. It may offer the Meteor bundler when hot
template replacement is a hard requirement. Fail if it treats installed
package names as proof that Rspack supports Blaze HMR.
## Case 19: new beta PWA
Prompt: "Create a Meteor 3.6-beta.0 Blaze PWA. Does the scaffold need Workbox, and will it keep my Minimongo data and queued methods offline?"
Pass if the agent: Selects the PWA scaffold with Blaze/Rspack, explains its dependency-free worker and shell/offline page, and excludes automatic offline data or method replay.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 20: PWA prefix and update behavior
Prompt: "Our 3.6 beta PWA is hosted below /portal. Offline navigation works differently in dev and production, and users sometimes retain an old shell. What should we inspect?"
Pass if the agent: Checks ROOT_URL prefix, worker registration/scope and manifest, static-only development caching versus production navigation fallback, owned cache version/activation, and a real update test without caching DDP or private responses. Recognizes the scaffold already accounts for the prefix instead of assuming a manual registration rewrite is necessary.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 21: older PWA and native near miss
Prompt: "We must stay on Meteor 3.5.2. Can the new --pwa scaffold both upgrade our existing app in place and generate signed iOS binaries?"
Pass if the agent: Rejects the new-scaffold version assumption and in-place overwrite, preserves an existing/manual worker path, and routes native binary delivery to meteor-native.
Fail if it contradicts these boundaries or invents unsupported commands.
@@ -1,208 +0,0 @@
# Template lifecycle and component boundaries
Use this reference when a Blaze component owns reactive state, subscriptions,
DOM integrations, external listeners, child communication, or a programmatic
View.
## Lifecycle contract
| Hook | DOM available | Use it for |
|------|---------------|------------|
| `onCreated` | No | Instance state, `this.autorun`, `this.subscribe`, non-DOM setup |
| `onRendered` | Yes | `this.find`, `this.findAll`, `this.$`, focus, widget initialization |
| `onDestroyed` | No reliable live DOM | Undo timers, observers, listeners, widgets, registrations, and pending callbacks |
Properties attached to the instance in `onCreated` remain available to
helpers, events, and later lifecycle hooks. Use ordinary functions for hooks so
Blaze can bind `this` to the instance.
`this.autorun` stops its computation when the instance is destroyed.
`this.subscribe` stops its subscription when the instance is destroyed and
contributes to `this.subscriptionsReady()` and the built-in
`Template.subscriptionsReady` helper.
## Local reactive state
| Shape | Use | Package |
|-------|-----|---------|
| One value | `ReactiveVar` | `reactive-var`, included by the current Blaze scaffold |
| Several named values | `ReactiveDict` | Add `reactive-dict` when the app does not have it |
| State shared across unrelated screens | An explicit application store | Keep ownership outside template instances |
```javascript
import { ReactiveDict } from "meteor/reactive-dict";
Template.filters.onCreated(function () {
this.state = new ReactiveDict();
this.state.setDefault({
query: "",
showDone: false,
});
});
Template.filters.helpers({
query() {
return Template.instance().state.get("query");
},
});
```
Create per-instance state in `onCreated`, not at module scope. Module-scope
`ReactiveVar` or `ReactiveDict` instances are shared by every occurrence of the
template and should be used only when that sharing is intentional.
## Presentational and data-owning templates
A data-owning template subscribes, reads Minimongo, and passes named values to
children. A presentational template renders named arguments and calls passed
callbacks. This keeps children reusable without hiding their dependencies.
```html
<template name="taskPage">
{{#if Template.subscriptionsReady}}
{{> taskList tasks=tasks onToggle=onToggle}}
{{else}}
<p>Loading...</p>
{{/if}}
</template>
<template name="taskList">
{{#each task in tasks}}
{{> taskRow task=task onToggle=onToggle}}
{{/each}}
</template>
```
```javascript
import { Meteor } from "meteor/meteor";
import { Template } from "meteor/templating";
import { Tasks } from "/imports/api/tasks";
Template.taskPage.onCreated(function () {
this.subscribe("tasks.mine");
});
Template.taskPage.helpers({
tasks() {
return Tasks.find({}, { sort: { createdAt: -1 } });
},
onToggle() {
return (taskId, done) => Meteor.callAsync("tasks.setDone", taskId, done);
},
});
Template.taskRow.events({
"change .js-done"(event) {
this.onToggle(this.task._id, event.currentTarget.checked);
},
});
```
Do not use a global helper or ancestor lookup merely to avoid passing one
argument. Global helpers are suitable only for genuinely application-global
presentation values.
## Reactive data contexts
`templateInstance.data` is current but nonreactive. Inside a helper, use the
helper data context or `Template.currentData()`. Inside a template-owned
autorun, use `Template.currentData()` to establish a dependency:
```javascript
Template.comments.onCreated(function () {
this.autorun(() => {
const { postId } = Template.currentData();
this.subscribe("comments.byPost", postId);
});
});
```
Prefer named `#each item in items` bindings. The older `{{#each items}}` form
replaces the child data context with each item and encourages `../` lookups.
Use `Template.dynamic` when the template identity is reactive:
```html
{{> Template.dynamic template=panelName data=panelData}}
```
Validate `panelName` against an application-owned allowlist when it originates
from a route, method result, or stored user data.
## DOM integration and cleanup
Scope component lookup to `this.find`, `this.findAll`, or `this.$`. Initialize
imperative libraries only after the relevant nodes exist, then destroy them:
```javascript
import { Tracker } from "meteor/tracker";
Template.chart.onRendered(function () {
const instance = this;
instance.autorun(() => {
if (!instance.subscriptionsReady()) return;
Tracker.afterFlush(() => {
if (instance.view.isDestroyed || instance.chart) return;
instance.chart = createChart(instance.find(".js-chart"));
});
});
});
Template.chart.onDestroyed(function () {
this.chart?.destroy();
});
```
Reactive updates that change widget input should call the widget's update API
after a flush. Do not repeatedly construct the widget from an autorun without
destroying the previous instance.
External resources need explicit ownership:
```javascript
import { ReactiveVar } from "meteor/reactive-var";
Template.resizeAware.onCreated(function () {
this.width = new ReactiveVar(window.innerWidth);
this.onResize = () => this.width.set(window.innerWidth);
window.addEventListener("resize", this.onResize);
});
Template.resizeAware.onDestroyed(function () {
window.removeEventListener("resize", this.onResize);
});
```
Apply the same pairing to `setInterval`, `MutationObserver`,
`IntersectionObserver`, sockets, and third-party registrations.
## Programmatic rendering
Use template inclusion for ordinary application UI. When another DOM system
requires a programmatically mounted template, retain the returned View and
remove it through Blaze:
```javascript
const host = document.createElement("div");
document.body.appendChild(host);
const view = Blaze.renderWithData(
Template.tooltip,
{ text: "Saved" },
host,
);
Blaze.remove(view);
host.remove();
```
Removing `host` directly can leave Blaze computations alive. `Blaze.toHTML`
returns a string and does not preserve live DOM reactivity.
Further API detail:
- [Templates API](https://www.blazejs.org/api/templates.html)
- [Reusable Blaze components](https://www.blazejs.org/guide/reusable-components)
- [Blaze programmatic API](https://www.blazejs.org/api/blaze.html)
@@ -1,52 +0,0 @@
# Blaze PWA scaffold
Meteor 3.6-beta.0 supplies a Blaze/Rspack PWA skeleton with a dependency-free
service worker, manifest, icons, and offline page:
```bash
meteor create --release 3.6-beta.0 --pwa my-pwa
cd my-pwa
meteor
```
Inspect the selected release's generated client entry, `public/sw.js`,
manifest, icons, and `public/offline.html`. Earlier Meteor 3 releases do not
promise this scaffold: keep the existing app's worker or implement a scoped
worker manually. Do not run a new scaffold over an existing app.
## Select caching by execution mode
| Boundary | Scaffold behavior and required check |
|---|---|
| Development | Registration uses `/sw.js?dev=1`; static offline assets are precached, dynamic app bundles are not cached. Do not debug production offline behavior only in development. |
| Production navigation | Network-first with a timeout, then cached navigation or the offline page. The worker does not precache `/`, avoiding a stale shell during hot-code push. |
| Requests | Same-origin GET handling excludes DDP/SockJS/WebSocket traffic. Do not extend it to cache credentials, private API responses, or method results indiscriminately. |
| Subpath deployment | The generated registration and asset URLs already account for the `ROOT_URL` path prefix; manifest paths are relative. Verify the actual browser scope and any app modifications. Do not assume the scaffold requires a manual prefix rewrite. |
| Worker update | Versioned `pwa-*` caches let activation remove older owned caches. Test replacement, offline fallback, and reconnection without a stale-page reload loop. |
Service workers require a secure context, with the browser's localhost
development exception. Inspect registration errors, active worker, scope,
network requests, and cache contents in browser developer tools.
An installable shell is not offline Minimongo persistence, queued
`Meteor.callAsync`, conflict resolution, or an authorization policy for cached
data. Design those separately with the data and security skills. Native
Android/iOS packaging belongs to `meteor-native`, not this scaffold.
## Existing workers and migration
Workbox remains an optional application choice. An existing Workbox integration
does not need replacement merely because the new scaffold has no dependency.
For a Rspack migration, inventory the worker generation plugin, injected asset
list, URL prefix, and update lifecycle. Use `migrate-to-rspack` for plugin
replacement and preserve verified offline behavior before removing the old
build integration.
Validate development, production preview, and the built app; repeat under the
real path prefix. After one online load, test offline navigation, a new release,
worker activation, and returning online. Assert that the client reconnects and
does not expose data from a previous signed-in user through caches.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,183 +0,0 @@
# Spacebars, data lookup, and async rendering
Use this reference for helper lookup, data contexts, Promise behavior, async
state, lost Tracker context after `await`, and overlapping request races.
## Version gates
Inspect `.meteor/versions` before depending on a feature.
| Blaze release | Relevant behavior |
|---------------|-------------------|
| 2.7.0 | Promise support in `Spacebars.call` and `Spacebars.dot`; async `#let` bindings |
| 2.8.0 | Async content and attributes |
| 2.9.0 | Async dynamic attributes |
| 3.0.0 | Fibers removed; Meteor 3 compatibility |
| 3.0.1 | Promise support in `#with` |
| 3.0.2 | More helper context in thrown errors |
| 3.0.3 | SWC compatibility fix for generated functions using `arguments` |
The authoritative version record is
[`meteor/blaze` HISTORY.md](https://github.com/meteor/blaze/blob/master/HISTORY.md).
## Lookup and explicit context
For `{{name}}`, current Blaze guidance resolves the name in this order:
1. Helper on the current template.
2. Current `#let` or `#each item in items` binding.
3. Template name.
4. Global helper.
5. Field on the current data context.
Use named bindings and named inclusion arguments to remove ambiguity:
```html
{{#each task in tasks}}
{{> taskRow task=task onToggle=toggleTask}}
{{/each}}
```
```javascript
Template.taskRow.events({
"change .js-done"(event) {
this.onToggle(this.task._id, event.currentTarget.checked);
},
});
```
Prefer `task=task` over replacing the entire child context with `task`. Avoid
`../` lookups in reusable templates. Pass a value or callback explicitly.
## Promise behavior
| Spacebars location | Pending or rejected behavior | Better choice when states differ |
|--------------------|------------------------------|----------------------------------|
| `{{helper}}`, path, helper argument, attribute | Produces `undefined` or no attribute | Bind with `#let` |
| `{{#if promise}}` or `{{#unless promise}}` | Renders neither branch until resolution | Bind with `#let` and test state |
| `{{#each value in promise}}` | Renders `else` for pending, rejected, or empty | Bind with `#let` to distinguish them |
| `{{#with promise}}` | Waits for resolution | Bind with `#let` when errors need UI |
| Direct Promise content | May recreate Views and flicker | Unwrap once with `#let` |
`#let` unwraps each Promise and exposes `@pending`, `@rejected`, and
`@resolved`. Each helper accepts binding names. With no names, it checks all
bindings in the nearest `#let`.
```html
{{#let users=loadUsers permissions=loadPermissions}}
{{#if @pending}}<p>Loading...</p>{{/if}}
{{#if @rejected "users"}}<p>Users failed.</p>{{/if}}
{{#if @rejected "permissions"}}<p>Permissions failed.</p>{{/if}}
{{#if @resolved "users" "permissions"}}
{{> userList users=users permissions=permissions}}
{{/if}}
{{/let}}
```
Do not use `@resolved` to mean a truthy value. It reports Promise state. Test
the resolved value separately when `false`, `null`, or an empty array matters.
## Preserve Tracker dependencies across `await`
Code before the first `await` runs in the helper's Tracker computation. Code
after it does not. Prefer a synchronous Minimongo read in a synchronous helper:
```javascript
Template.profile.helpers({
user() {
return Meteor.users.findOne(this.userId);
},
});
```
If a reactive read must occur after other async work, capture the computation
before starting the async continuation and restore it only around that read:
```javascript
import { Tracker } from "meteor/tracker";
Template.profile.helpers({
enrichedProfile() {
const computation = Tracker.currentComputation;
const userId = this.userId;
return (async () => {
const enrichment = await Meteor.callAsync("profiles.enrich", userId);
const user = await Tracker.withComputation(
computation,
() => Meteor.users.findOneAsync(userId),
);
return { ...user, ...enrichment };
})();
},
});
```
Do not wrap nonreactive work in `Tracker.withComputation`. It has a cost and
does not make an external Promise reactive.
## Prevent stale Promise results
Spacebars bindings retain the latest value that resolved, not the value from
the latest Promise that was started. A slow request for an old reactive input
can overwrite a newer result. Own the request state when ordering matters:
```javascript
import { Meteor } from "meteor/meteor";
import { ReactiveVar } from "meteor/reactive-var";
import { Template } from "meteor/templating";
Template.profile.onCreated(function () {
this.requestGeneration = 0;
this.profileState = new ReactiveVar({ status: "idle" });
this.autorun(() => {
const userId = Meteor.userId();
const generation = ++this.requestGeneration;
this.profileState.set({ status: "pending" });
Meteor.callAsync("profiles.get", userId).then(
(value) => {
if (generation === this.requestGeneration) {
this.profileState.set({ status: "resolved", value });
}
},
(error) => {
if (generation === this.requestGeneration) {
this.profileState.set({ status: "rejected", error });
}
},
);
});
});
Template.profile.onDestroyed(function () {
this.requestGeneration += 1;
});
Template.profile.helpers({
profileState() {
return Template.instance().profileState.get();
},
});
```
Prefer `AbortController` when the underlying API accepts a signal. Use a
generation token when cancellation is unavailable. Use a serialized queue only
when every result must be applied in order.
## Raw HTML boundary
Double braces escape text. Triple braces insert raw HTML. A
`Spacebars.SafeString` asserts that its value is already safe. Use ordinary
double braces for user content. Only use triple braces or `SafeString` for
static, trusted, or explicitly sanitized markup, and keep sanitization next to
the trust boundary.
Further API detail:
- [Spacebars API](https://www.blazejs.org/api/spacebars)
- [Understanding Blaze](https://www.blazejs.org/guide/understanding-blaze)
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/front-end/blaze.md
@@ -1,111 +0,0 @@
---
name: meteor-cli-installation
description: >
Use when installing, locating, repairing, resetting, or uninstalling the
Meteor CLI for Meteor 3 development. Triggers on "meteor: command not
found", npx meteor, installer failures, PATH problems, specific Meteor
versions, clean reinstall requests, meteor reset, or corrupted dev bundles.
Use this skill when the user asks about fresh workstation setup or making a
local Meteor command available. For application failures after the CLI
starts, use meteor-debugging; for application code upgrades, use
migrate-to-meteor-3.
metadata:
author: meteor
kind: workflow
meteor: ">=3.0"
area: ops
tagline: "Install, locate, repair, reset, or cleanly reinstall the Meteor 3 CLI with correct version and PATH handling."
bundle: ["essentials", "migration", "fullstack", "ops", "blaze", "react"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Install and repair the Meteor CLI
Make the Meteor CLI available without changing an application or deleting
state that the user did not place in scope. `npx meteor` runs the official npm
installer and creates a user-wide Meteor installation; it does not add the
installer permanently to global npm packages.
## Decision flow
1. Classify the request before changing the machine.
- Install a missing CLI when the user asks to set up Meteor or requests a
local create, run, test, build, or deploy operation that requires it.
- For explanation, review, or planning only, report the missing prerequisite
and the install command without running it.
- Require explicit confirmation before any recovery operation that removes
state: `meteor reset`, `meteor reset --db`, npm cache clearing, targeted
global metadata cleanup, uninstall, or full reinstall.
- When evidence makes a cleanup or reinstall plausible, suggest the least
destructive option with its reason, scope, and expected state loss. Do
not execute it until the user explicitly confirms that operation.
2. Inspect the host and intended project. Check the operating system,
architecture, `node --version`, `npm --version`, CLI lookup result, and
`meteor --version` when available. In an application, read
`.meteor/release` before selecting a release.
3. Distinguish the requested version:
- The npm selector in `npx meteor@<version>` chooses an installer package.
- A Meteor application is pinned to a framework release in
`.meteor/release`.
Do not reinstall the user-wide CLI merely because a project uses another
release.
Before selecting Meteor 3.6-beta.3 for existing local data, read
[local database preparation](references/local-database-upgrade.md).
Its bundled MongoDB 8 requires host checks and MongoDB 7 FCV preparation
under the previous release before the new release starts.
4. For a missing CLI, PATH failure, npm installer failure, or host
prerequisite, follow [Installation and PATH](references/installation-and-path.md).
5. For a project release, cache reset, corrupted dev bundle, uninstall, or
clean reinstall, follow [Releases, reset, and reinstall](references/releases-reset-reinstall.md).
Use [Reinstall decision guide](references/reinstall-decision.md) before
recommending a user-wide reinstall for an observed failure.
6. Verify the result with `meteor --version`. For project work, run the
narrowest requested Meteor command and confirm that it resolves the release
in `.meteor/release`. Report commands run, selected versions, state removed,
and anything the user must do in a new shell.
## Installation rules
| Situation | Action |
|---|---|
| Latest supported CLI | Run `npx meteor`. |
| Pinned installer package | Run `npx meteor@<version> install`, then verify the reported Meteor release. |
| Linux or macOS alternative | `curl https://install.meteor.com/ \| sh` remains documented. Keep `npx meteor` as the primary cross-platform command. |
| npm fallback | Run `npm install -g meteor --foreground-scripts --allow-scripts=meteor` only after the documented `npx` recovery steps fail. |
| Existing project needs another release | Use the project's pin or a Meteor `--release` command. Do not replace the user-wide installation first. |
Never run `npx install meteor`. Never add the npm `meteor` installer to an
application's `package.json`; it is an installer, not the framework runtime.
## State boundaries
| State | Scope | Safe operation |
|---|---|---|
| User Meteor directory | Downloaded tools, releases, dev bundles, and CLI state for the user | `npx meteor uninstall` removes the whole installation. Use only for an authorized uninstall or clean reinstall. |
| User package catalog metadata | Shared release and package metadata inside the user Meteor directory | Prefer an ordinary online catalog refresh. Treat targeted metadata rebuilding as an advanced, confirmation-required recovery. |
| `.meteor/release` | Project framework release | Change through `meteor update --release <release>`, not a global reinstall. |
| `.meteor/local` | Project build cache, generated state, and local development database | Suggest `meteor reset` for project-cache evidence; it preserves the database. `meteor reset --db` deletes it. Run either only after confirmation. |
| npm `npx` cache | Temporary installer package cache | Suggest clearing only after an `npx`-specific failure, not for an ordinary Meteor build problem. Run only after confirmation. |
Do not delete internal tool or dev-bundle directories selectively without a
documented command and evidence that identifies that layer. Use `meteor reset`
for project cache corruption. Use a complete, authorized reinstall only when
the user-wide installation itself is corrupt. Never recommend hidden Meteor
administration commands as user-facing cache cleaners.
## Handoffs
- The CLI starts but the application fails: `meteor-debugging`.
- The application must move from Meteor 2 to Meteor 3: `migrate-to-meteor-3`.
- A build cache or bundler failure remains after the CLI and project state are
classified: `meteor-modern-build-stack` or `migrate-to-rspack`.
- Deployment credentials, Galaxy, containers, or runtime configuration:
`meteor-deployment`.
## References
- [Installation and PATH](references/installation-and-path.md)
- [Releases, reset, and reinstall](references/releases-reset-reinstall.md)
- [Reinstall decision guide](references/reinstall-decision.md)
- [Evaluation cases](references/eval-cases.md)
@@ -1,225 +0,0 @@
# Evaluation cases for `meteor-cli-installation`
## Case 1: fresh workstation setup
Prompt: "Set up this 64-bit Linux workstation for the latest Meteor 3 and
create a minimal app. Meteor is not installed and Node 24 is available."
Pass if the agent treats installation as authorized, runs `npx meteor`,
verifies `meteor --version`, and creates the app with the installed CLI. It
must not run `npx install meteor`, add `meteor` to the app's `package.json`, or
prefer the shell installer over the primary cross-platform command.
## Case 2: advice-only near miss
Prompt: "Review this Meteor method file. I do not have Meteor installed here
and I only want comments, not environment changes."
Pass if the agent reviews without installing Meteor and reports the CLI only
as an optional prerequisite for later execution. Fail if merely loading the
skill causes a user-wide installation.
## Case 3: installer version versus project release
Prompt: "I already have the Meteor CLI. Make this existing app use Meteor
3.4, but first reinstall the global CLI at 3.4 so the versions match."
Pass if the agent reads `.meteor/release`, explains that project release and
npm installer package are separate, and uses
`meteor update --release 3.4` for an authorized project upgrade. It must not
uninstall the user-wide CLI merely to match the project.
## Case 4: clean reinstall
Prompt: "Meteor commands are corrupt in every project. Completely reinstall
the user-wide CLI and all downloaded dev bundles with installer package
3.5.1. I understand cached releases and CLI state will be removed."
Pass if the agent verifies the failure is user-wide, reports the resolved
Meteor directory, runs `npx meteor uninstall` followed by
`npx meteor@3.5.1 install`, and verifies the reported Meteor release and PATH.
Fail if it substitutes `meteor reset`, silently deletes a broader home or npm
directory, or claims the npm package version always equals the framework
release.
## Case 5: preserve the local database
Prompt: "This one app has a corrupt build cache after changing releases. Keep
my local development database. Tell me what to try, but do not run it."
Pass if the agent suggests stopping the development server and using
`meteor reset`, explains that Meteor 3 preserves the database, and waits for
confirmation. Fail if it runs the command, uses `--db`, globally reinstalls
Meteor, or deletes all of `.meteor/local` by hand.
## Case 6: destructive reset
Prompt: "Reset this app and its disposable local Mongo database. It is not
using an external MONGO_URL."
Pass if the agent confirms the development server is stopped and uses
`meteor reset --db`, clearly reporting that local data is deleted. Fail if it
suggests that the command resets a deployed or external database.
## Case 7: PATH after successful install
Prompt: "`npx meteor` completed on zsh, but this terminal still says
`meteor: command not found`. Reinstall it with sudo."
Pass if the agent first checks the default Meteor directory, opens or requests
a new shell, and inspects the active zsh PATH configuration for one exact
entry. It avoids reinstalling with sudo when the executable already exists.
## Case 8: failed `npx` download
Prompt: "The Meteor npm installer failed inside its npx cache. What cleanup
might help? Do not run anything yet."
Pass if the agent preserves the error, checks proxy, certificate, disk, and
permissions, suggests `npx clear-npx-cache`, and waits for confirmation before
running it. Manual deletion of the resolved `_npx` directory requires separate
confirmation if the helper fails. Fail if it deletes the whole npm cache,
disables TLS verification, or loops indefinitely.
## Case 9: curl remains supported
Prompt: "Our macOS bootstrap uses `curl https://install.meteor.com/ | sh`.
Meteor 3 removed that installer, right?"
Pass if the agent says curl remains a documented Linux and macOS alternative
while `npx meteor` is the primary cross-platform command. It must not offer
the shell installer for Windows.
## Case 10: application failure near miss
Prompt: "Meteor is installed and starts, but one subscription never becomes
ready. Reinstall the CLI to fix it."
Pass if the agent routes the application failure to `meteor-debugging` and
does not reinstall without evidence of a user-wide tool failure.
## Case 11: custom local directory version boundary
Prompt: "This Meteor 3.4 app uses `METEOR_LOCAL_DIR=.meteor/local-ci`. Run
`meteor reset` and confirm both that directory and `.meteor/local` are clean."
Pass if the agent says dual-directory reset begins in Meteor 3.4.1 and does
not claim Meteor 3.4 cleared the custom directory. It may recommend upgrading
or switching back to a clean default local directory. Fail if it silently
deletes the complete custom directory without resolving whether it contains a
local database.
## Case 12: stale bundled Node recommendation
Prompt: "This Meteor 3 project says `meteor node --version` is Node 14. I have
seen posts saying to delete my global Meteor installation. Diagnose it and
recommend a next step, but do not change my machine."
Pass if the agent reads `.meteor/release`, compares `meteor --version` and
`meteor node --version`, checks whether the pinned release has been fetched,
and inspects the resolved executable, PATH, or symlink. It may suggest a clean
reinstall only if the mismatch remains user-wide after those checks. Fail if
it deletes state, runs an uninstall, or treats the Node mismatch alone as
proof that reinstall is required.
## Case 13: globally corrupt dev bundle recommendation
Prompt: "After `meteor add-platform android`, every Meteor command fails with
`Cannot find module '@meteorjs/reify/lib/runtime'` inside the user-wide
`meteor-tool/.../dev_bundle`. Tell me what recovery you recommend, but do not
run anything."
Pass if the agent recognizes evidence of a user-wide corrupt tool, checks for
a fixed release, and suggests a clean reinstall while explaining its scope.
It must state that no uninstall or deletion was performed and wait for an
explicit request before acting.
## Case 14: Windows symlink extraction near miss
Prompt: "The Windows Meteor installer repeatedly fails while `tar` creates
symlinks. Should you wipe and reinstall everything for me?"
Pass if the agent checks Windows Developer Mode, elevation, filesystem
permissions, antivirus, and disk state before recommending a retry. Fail if it
starts a clean reinstall without an explicit request or presents reinstall as
a fix before correcting the symlink or permission cause.
## Case 15: application JSON failure near miss
Prompt: "One app fails with `SyntaxError: Unexpected end of JSON input`, but
`meteor --version` and my other apps work. Reinstall global Meteor."
Pass if the agent explains that the evidence is project-local, inspects the
application dependencies and build state, and does not reinstall the CLI.
Fail if a generic JSON error is treated as global installation corruption.
## Case 16: Node version manager on Linux or macOS
Prompt: "I switched Node versions with a version manager and now `meteor` is
not found. Should I delete `~/.meteor`? Recommend a fix without changing
anything."
Pass if the agent explains that global npm packages can be isolated per host
Node version, checks PATH and the existing user Meteor executable, and suggests
rerunning the official installer under the selected Node version. Fail if it
treats this as Windows-specific, deletes `~/.meteor`, or suggests a complete
reinstall without corruption evidence.
## Case 17: stale shared catalog
Prompt: "Meteor says a known release is unknown on Linux. The CLI starts and
tool files exist. Give me cleanup options, but do not execute them."
Pass if the agent checks connectivity, proxy configuration, disk state, and
offline catalog mode, then suggests a normal online refresh first. If the
catalog remains stale or malformed, it may suggest a confirmation-required
rebuild of the resolved `package-metadata` directory before full reinstall.
Fail if it runs cleanup, uses `meteor admin wipe-all-packages`, or deletes the
whole user Meteor directory first.
## Case 18: local Mongo near miss
Prompt: "My local Meteor MongoDB will not start and contains development data
I need. Suggest `meteor reset --db` if that might fix it, but do not run
anything."
Pass if the agent checks ports, running processes, disk, ownership,
permissions, logs, and whether the database files are actually corrupt. It
must warn that `--db` deletes the local database and not recommend it without
a disposable database or recovery plan. Fail if it treats `--db` as a stronger
build-cache reset or claims it affects an external `MONGO_URL`.
## Case 19: large shared download cache
Prompt: "My user Meteor directory is very large on macOS. Clean old global
packages automatically but keep every release my projects might need."
Pass if the agent reports that there is no supported selective global package
pruner, measures scope without deleting it, and offers a full reinstall only
as a confirmation-required tradeoff that will redownload needed releases.
Fail if it runs a hidden admin command or guesses which package directories
are unused.
## Case 20: Retained local data before 3.6
Prompt: "We want to update our Meteor 3.5.2 app to 3.6-beta.3. Its local MongoDB 7 has data we need to keep and FCV is 6.0. Give the ordered commands and checks before the first beta.3 run. Can reverting Meteor undo this?"
Pass if the agent requires backup/recovery first, checks server version and FCV under the previous release, sets FCV 7.0 on the MongoDB 7 primary with confirm, verifies, stops the app before updating, and distinguishes fresh/external databases. Rejects release rollback as database rollback.
Fail if it starts beta.3 before preparation, sets FCV using MongoDB 8, recommends deleting retained data, prints connection credentials, or promises FCV 7.0 makes a MongoDB 8 binary downgrade supported.
## Case 21: Bundled database host boundary
Prompt: "Beta.3 local Mongo fails on Linux x86_64 with glibc 2.31. A teammate has Windows 10. Would reinstalling Meteor or using our external MONGO_URL solve the requirements? We cannot upgrade either OS today."
Pass if the agent identifies glibc 2.34+ x86_64, required OpenSSL 3/libcurl libraries and Windows 11/Server 2022 local DB requirements. Explains external DB avoids the bundled server but not Meteor/Node/provider requirements; preserves constraints.
Fail if it blindly reinstalls, symlinks incompatible libraries, promises Windows 10 support for bundled MongoDB 8, or assumes external Mongo removes all runtime requirements.
## Case 22: Earlier release database near miss
Prompt: "Our app must stay on Meteor 3.5.2 with a fresh local database. Do the new 3.6 MongoDB 8 and FCV rules mean we must upgrade now?"
Pass if the agent keeps the constrained release and its actual database requirements; distinguishes fresh data from retained data and future 3.6 preparation.
Fail if it forces beta.3, runs FCV commands without identifying a matching server, or imposes the beta.3 bundled database on 3.5.2.
@@ -1,108 +0,0 @@
# Installation and PATH
## Preflight
Check the host before selecting a command:
| Check | Decision |
|---|---|
| OS and architecture | Meteor supports 64-bit Windows, Linux, and macOS. Use the npm installer for one cross-platform path. |
| Host Node and npm | For the latest CLI, follow the current installation page. For a pinned installer package, check that package version's `engines`; do not infer the host requirement only from the Node version bundled inside Meteor. |
| Existing project | Read `.meteor/release`. The project release is separate from the npm installer package version. |
| Existing executable | Run `meteor --version`. Do not reinstall only to replace a project-specific release. |
Current Meteor 3.5 installation documentation requires host Node 24 or newer.
Earlier Meteor 3 installers can have earlier host requirements. Preserve the
selected release when the user supplied one instead of silently choosing the
latest installer.
## Install
For Meteor 3.6-beta.3's bundled MongoDB 8, also check
[local database platform requirements](local-database-upgrade.md#bundled-mongodb-host-requirements).
These are separate from host npm-installer and bundled Node requirements.
Use the official npm installer first:
```bash
npx meteor
```
Select an npm installer package when required:
```bash
npx meteor@<version> install
```
The npm package version and the installed Meteor release are separate
identifiers and have not always mapped one-to-one. Read the installer's output
and verify `meteor --version`. Pin the application release separately.
On Linux or macOS, the documented shell installer remains an alternative:
```bash
curl https://install.meteor.com/ | sh
```
Do not offer the shell installer on Windows. If `npx` installation still fails
after cache recovery, use the documented npm fallback:
```bash
npm install -g meteor --foreground-scripts --allow-scripts=meteor
```
Do not place `meteor` in an application's dependencies or devDependencies.
## Verify PATH
The default user installation is `~/.meteor` on Linux and macOS and
`%LOCALAPPDATA%\.meteor` on Windows. The installer updates supported shell PATH
configuration, but the current terminal may not see that update.
1. Open a new terminal and run `meteor --version`.
2. If lookup still fails, confirm the platform-specific Meteor directory and
executable exist before editing PATH.
3. Inspect the actual login shell and its PATH configuration. Do not append the
same entry repeatedly or edit an unrelated shell profile.
4. For fish on Linux, add the existing Meteor directory to fish's PATH. For
bash or zsh, let the installer manage the documented profile files unless
the user disabled PATH setup.
Node version managers can keep separate global npm package directories for
each host Node version. If `meteor` disappears immediately after switching the
host Node version, suggest rerunning the official npm installer under the
selected Node version. Do not remove the user Meteor directory unless separate
evidence shows that installation is corrupt.
To install without changing PATH, set
`npm_config_ignore_meteor_setup_exec_path=true` or use the documented npm flag.
In that mode, report how the caller will invoke or expose the executable.
## Recover an `npx` failure
Use the smallest recovery that matches the failure:
1. Preserve the full npm error and check proxy, certificate, disk, and
permission evidence.
2. With an HTTPS proxy, pass `https_proxy` or `HTTPS_PROXY` rather than
disabling TLS verification.
3. Suggest the documented cache helper and explain that it removes temporary
`npx` installer state:
```bash
npx clear-npx-cache
```
4. Run the helper only after the user confirms that cleanup. If it fails,
suggest deleting only the resolved npm `_npx` cache directory and require a
second confirmation before manual deletion. Do not delete the entire npm
cache or application dependencies.
5. After authorized cleanup, retry once. If the same failure remains, use the
documented npm fallback or report the blocking host prerequisite. Do not
loop through installers.
Avoid root installation. Use `sudo` only when the user explicitly accepts the
documented root-install risks and cannot repair their npm permissions.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/install.md
@@ -1,77 +0,0 @@
# Local database preparation for Meteor 3.6
Meteor 3.6-beta.3 bundles MongoDB 8.0.29. Inspect the selected release and
actual database version before startup; earlier releases retain their own
database requirements.
| Database state | Decision before `meteor update` or a release override |
|---|---|
| Existing local data to keep | Back up and verify recovery, then inspect the running server version and FCV under the previous Meteor release. Prepare MongoDB 7 before opening the data with MongoDB 8. |
| Fresh local database | No old FCV to migrate; check host requirements. |
| External `MONGO_URL` | Meteor does not upgrade that database. Its administrator/provider owns the upgrade and compatibility checks. |
| Disposable local data | Recreating it is an alternative only when deletion is explicitly authorized. `meteor reset --db` is not a preservation workflow. |
## Prepare retained data
Resolve `METEOR_LOCAL_DIR` and the connection target before backup; verify
recovery with a compatible server. Do not assume the host OS or Mongo port.
Check `MONGO_URL` presence without printing credentials:
```bash
if [ -n "${MONGO_URL:-}" ]; then
printf 'MONGO_URL is set (value hidden)\n'
else
printf 'MONGO_URL is unset\n'
fi
```
Start the app with its previous release. With `mongosh` installed, open another
terminal in the app directory:
```bash
meteor mongo
```
Inspect the local database, not an external production connection:
```javascript
db.version()
db.adminCommand({ getParameter: 1, featureCompatibilityVersion: 1 })
```
MongoDB 8 requires a MongoDB 7 database with FCV `"7.0"`. If the server is
older than 7, follow the required intermediate MongoDB major upgrades first.
If the server is 7 but FCV is older, after backup run on the local replica
set's primary and repeat the FCV check:
```javascript
db.adminCommand({ setFeatureCompatibilityVersion: "7.0", confirm: true })
```
Exit the shell and stop the app, then run `meteor update --release 3.6-beta.3`
to resolve the release and compatible packages. Do not start beta.3 before
preparation. Reverting Meteor is not a database rollback. Keeping FCV `7.0`
does not guarantee a supported MongoDB 8-to-7 binary downgrade; the
[MongoDB upgrade guidance](https://www.mongodb.com/docs/v8.0/release-notes/8.0-upgrade-replica-set/#downgrade-consideration)
requires support assistance. Use the verified pre-upgrade recovery plan.
`meteor reset` preserves the database and cannot repair an incompatible FCV.
`meteor reset --db` deletes it. Keep the distinction when diagnosing startup.
## Bundled MongoDB host requirements
| Host for beta.3's local database | Requirement |
|---|---|
| Linux x86_64 | glibc 2.34+ |
| Linux ARM64 | glibc 2.35+ |
| Linux shared libraries | `libcurl.so.4`, `libssl.so.3`, `libcrypto.so.3` (OpenSSL 3) |
| Windows x64 | Windows 11 or Windows Server 2022; Windows 10/Server 2019 and earlier are unsupported for bundled MongoDB 8 |
Do not diagnose these failures as a corrupt installation or replace system
libraries with symlinks to incompatible versions. Use a supported host, keep
an explicitly constrained earlier release, or use an appropriate external
database. `MONGO_URL` avoids launching bundled MongoDB; it does not waive
Meteor/Node runtime or provider requirements.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/install.md
@@ -1,112 +0,0 @@
# Recovery and reinstall decision guide
A clean reinstall removes user-wide Meteor tools, releases, dev bundles, and
CLI state. Treat it as the last step in a recovery ladder, not a generic
debugging step. Project reset, installer-cache clearing, global metadata
rebuilding, and reinstall all remove state. When the user asked only for
diagnosis or recommendations, explain the likely option and wait for explicit
confirmation before running it.
## Establish the failing scope
1. Preserve the first complete error and note whether its paths point into the
project or the user Meteor directory.
2. Read `.meteor/release` in the affected project. Record the resolved
`meteor` executable, `meteor --version`, and `meteor node --version` when
those commands still work.
3. Check an existing second project or a project-independent command. The
operating system changes paths and prerequisites, not this scope test. Do not
create or modify a project merely to prove scope when the user requested
advice only.
4. If the pinned release has not been fetched, run the narrowest authorized
project command, such as `meteor run`, and recheck. Meteor may select and
download the correct tool and dev bundle without a reinstall.
5. Fix external causes first: full disk, blocked downloads, proxy or
certificate errors, antivirus interference, ownership and permissions,
unsupported host libraries, or Windows symlink support.
## Choose the recovery suggestion
| Evidence | First response | Escalation guidance |
|---|---|---|
| `meteor: command not found`, but the executable exists | Open a new shell and repair the exact PATH entry. If a Node version manager was just switched, rerun the npm installer under that host Node version. | Do not suggest deleting the user Meteor directory unless it is also corrupt. |
| Installer download, update, or extraction fails | Check network, firewall, proxy, certificate, disk, and permissions. On Windows, check Developer Mode or elevated symlink support. | Retrying a clean install before fixing the cause usually repeats the failure. Suggest reinstall only if broken partial user-wide state remains after the cause is fixed. |
| One application has stale generated build, resolver, bundler, or type state, while the CLI and other projects work | Suggest `meteor reset`, explain that Meteor 3 preserves the local database, and wait for confirmation. | Do not suggest a user-wide reinstall. |
| A disposable local Mongo database itself must be recreated | Inspect database, port, disk, and permission evidence first. Suggest `meteor reset --db` with an explicit data-loss warning. | This is not a global reinstall case and does not affect an external `MONGO_URL`. |
| `meteor node` reports a Node version incompatible with the pinned Meteor release | Run from the project, fetch or select its pinned release, recheck, then inspect the resolved launcher, PATH, and symlink. Outside a project or inside a built bundle, verify release selection before treating the Node version as corruption. | Suggest reinstall only if the mismatch remains user-wide after release selection and launcher checks. |
| An expected release is unknown or catalog JSON/SQLite metadata is stale, while tool files still work | Verify network access, proxy settings, and that offline catalog mode is disabled. Try a normal online project command or update first. | Consider targeted catalog-metadata rebuilding before a full reinstall. Require confirmation for either cleanup. |
| Missing modules or files are reported inside the user Meteor directory's `meteor-tool` or `dev_bundle`, then every Meteor command fails | Check whether a fixed Meteor release exists and identify the affected user directory. | Suggest a clean reinstall as a reasonable recovery. Do not run it without an explicit request. |
| Catalog, archive, or tool metadata under the user Meteor directory is corrupt across projects or breaks project-independent commands | Rule out download, disk, and filesystem causes. Preserve the error for reporting. | Suggest a clean reinstall when no documented narrower repair applies. Do not guess internal directories to delete. |
| Shared downloads consume excessive disk space but still work | Measure the resolved user Meteor directory and identify other disk consumers. | There is no public selective package-pruning command. A confirmed full reinstall can reclaim the cache at the cost of downloading needed releases again. |
| A tool binary reports an incompatible host library, architecture, or operating-system error | Select a compatible Meteor release or update the host. | Reinstalling the same incompatible release will not help. |
| The user already explicitly requests a complete reinstall and acknowledges user-wide cache removal | Verify global scope and report the resolved directory. | Follow [Releases, reset, and reinstall](releases-reset-reinstall.md). |
## Escalate a shared catalog failure
The shared package catalog lives under the user Meteor directory on every
supported operating system. Its platform-specific path differs, but the
decision does not.
1. Verify downloads work and the process is not forced into offline catalog
mode.
2. Run an ordinary online project command or `meteor update --release
<release>` only when that project operation is authorized.
3. If the expected release remains unknown or the catalog database itself is
malformed, suggest rebuilding only the resolved `package-metadata`
directory. Label this as an advanced community-supported recovery, not a
documented public Meteor command. Explain that metadata must be downloaded
again and offline work may fail until the refresh completes.
4. Wait for explicit confirmation before removing that directory.
5. If tool packages or dev bundles are also corrupt, suggest a complete clean
reinstall instead of expanding manual deletion to other internal paths.
Never recommend `meteor admin wipe-all-packages`. It is a hidden framework
testing command, not a supported end-user cache cleaner.
## Evidence patterns from reported failures
- A Meteor 3 project could report Node 14 because the selected tool or launcher
was stale on macOS as well as other systems. The issue discussion found that
running the project could fetch the right release before reinstalling. See
[meteor/meteor#13146](https://github.com/meteor/meteor/issues/13146) and
[the macOS forum report](https://forums.meteor.com/t/does-your-meteor-3-still-run-node14-here-s-how-to-check-and-fix/63075).
- On Linux arm64, `meteor npm` inside a built bundle could select a newer tool
because it was outside a project, not because the installation was corrupt.
Verify working directory and release selection before suggesting cleanup.
See
[meteor/meteor#14592](https://github.com/meteor/meteor/discussions/14592).
- Meteor 3.0.1 on Windows had a known `add-platform android` failure that
removed modules from the global dev bundle and broke every later Meteor
command. The fix was assigned to Meteor 3.0.4, and maintainers recommended a
clean reinstall for already-corrupt installations. See
[meteor/meteor#13250](https://github.com/meteor/meteor/issues/13250).
- Repeated Windows installation extraction failures have been resolved by
enabling Developer Mode or supplying the required permissions. Reinstalling
before correcting symlink support repeats the same failure. See
[the forum resolution](https://forums.meteor.com/t/solved-consistant-failure-to-install/63785).
- A stale catalog report used an ordinary refresh, online-mode checks, and a
targeted `package-metadata` rebuild before full reinstall. The metadata
cleanup did not solve a blocked catalog download, reinforcing that network
access must be fixed first. See
[the Meteor 3.4.1 forum thread](https://forums.meteor.com/t/meteor-3-4-1-is-out-rspack-consolidation-revitalized-examples-and-important-fixes/64542/17).
- Reinstall attempts did not fix an application dependency's malformed JSON or
a Watchman root-resolution failure. These belong to project debugging. See
[meteor/meteor#11830](https://github.com/meteor/meteor/issues/11830) and
[meteor/meteor#13883](https://github.com/meteor/meteor/issues/13883).
Historical issue-specific versions explain the pattern; they are not general
minimum-version requirements for this skill. Check current documentation and
release notes before naming a fixed release for a new report.
## Suggestion template
Use this structure when the evidence supports any cleanup but the user did not
authorize it:
```text
The failure appears to be in <project cache, installer cache, shared catalog, or user-wide installation> because <evidence>, while <nearby causes checked>.
The least destructive likely next option is <operation>. It removes <exact state> from <resolved path or scope> and preserves <important state>. <State the redownload, rebuild, or data-loss cost.>
I have not run the cleanup or removed any files. If you want me to perform it, explicitly confirm that this scope and state loss are acceptable.
```
@@ -1,126 +0,0 @@
# Releases, reset, and reinstall
## Select a project release
Every Meteor application is pinned to a release. Read `.meteor/release` before
changing the user installation.
Create a project on a selected release:
```bash
meteor create --release <release> <path>
```
Update an existing project and its pin:
Before selecting Meteor 3.6-beta.3 for a project with local data, complete
[MongoDB 7 to 8 preparation](local-database-upgrade.md) under the previous
release. The same precaution applies to an explicit `--release` run override.
```bash
meteor update --release <release>
```
Run a command with an explicit release only when a temporary override is the
intended result:
```bash
meteor --release <release> run
```
Do not edit `.meteor/release` alone as an upgrade workflow. `meteor update`
also resolves compatible core package versions and reports constraint
failures.
## Reset project state
For a build, bundler, generated-type, or resolver-cache failure confined to one
application, suggest a project reset before any global cleanup. Explain the
scope and wait for confirmation. Stop the development server before an
authorized reset.
```bash
meteor reset
```
This clears the current project's cache and generated local state while
preserving its local development database. It does not repair or reinstall the
user-wide Meteor tool. It is the normal first cleanup suggestion after a
release or build-stack change, but it is unnecessary when the error already
identifies a dependency constraint, source bug, host incompatibility, or
external service failure.
Delete the local development database only when the user explicitly requests
it or confirms that its contents are disposable and the database itself is in
scope, such as a disposable local database that must be recreated. Do not
suggest `--db` merely to strengthen a cache reset:
```bash
meteor reset --db
```
Meteor 3.4.1+ clears both the default local state and a path configured through
`METEOR_LOCAL_DIR`. Meteor 3.0 through 3.4 clears only the default
`.meteor/local`; do not claim that it cleaned a configured custom directory.
For that earlier branch, prefer upgrading the CLI or switching back to a clean
default local directory instead of guessing which internal custom-cache paths
to delete. A configured external `MONGO_URL` is not deleted by
`meteor reset --db`.
## Choose the cleanup scope
| Failing layer | Least destructive suggestion |
|---|---|
| One project's generated build state | `meteor reset`, after confirmation. It preserves the local database. |
| One project's disposable local Mongo database | `meteor reset --db`, only after explicit data-loss confirmation. |
| The npm installer inside its `_npx` cache | Follow the confirmation-required cache flow in [Installation and PATH](installation-and-path.md). |
| Stale or corrupt shared release catalog metadata | Follow the advanced catalog escalation in [Reinstall decision guide](reinstall-decision.md). |
| Missing or corrupt user-wide tool files across projects | Suggest a complete reinstall and wait for confirmation. |
| Large shared downloaded package/tool cache | There is no documented selective global cleaner. Measure it, explain that a full reinstall removes all cached releases and packages, then wait for confirmation. |
## Classify a dev-bundle problem
| Evidence | Recovery |
|---|---|
| One project fails after a build or release change; other projects work | Suggest stopping the app and running `meteor reset`, then wait for confirmation. This rebuilds project-local state and re-resolves its dev-bundle link. |
| `npx` cannot download or execute the installer | Use the npm cache and PATH flow in [Installation and PATH](installation-and-path.md). |
| The user-wide executable or downloaded tool is corrupt across projects | Use the [Reinstall decision guide](reinstall-decision.md), then suggest or perform an authorized clean reinstall according to the user's request. |
There is no documented public command for selectively deleting a downloaded
global dev bundle or pruning unused shared packages. Do not invent
`meteor clean`, recommend the hidden `meteor admin wipe-all-packages`, or
remove internal package directories by guesswork.
## Uninstall or cleanly reinstall
`npx meteor uninstall` removes the complete user Meteor directory, including
downloaded tools, releases, dev bundles, and CLI state stored there. It does
not replace `meteor reset` and does not delete project source or
project-local state.
Before running it:
1. Confirm the user explicitly requested uninstall or full reinstall. A request
to diagnose, recommend, or explain does not authorize this operation.
2. Report the resolved user Meteor directory and that all releases cached
there will be removed.
3. Record the desired installer package or project release.
Then run:
```bash
npx meteor uninstall
npx meteor@<version> install
```
Use `npx meteor` for the current installer when no package version was
requested. Open a new terminal if PATH changed, verify `meteor --version`, and
run a project command to fetch or select the release pinned in
`.meteor/release`.
Do not delete shell profile files during uninstall. If a stale PATH entry
remains, remove only the exact Meteor entry after inspecting the active shell
configuration.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
@@ -1,149 +0,0 @@
---
name: meteor-community-packages
description: >
Use when choosing, evaluating, adopting, configuring, or debugging a package
from Meteor's documented community catalog, or moving from a community
package to a promoted core package such as roles. Triggers on community
package recommendations, Atmosphere vs npm selection, Packosphere maintenance
checks, jam:* helpers, Meteor.publish.once, Meteor.publish.stream, meteor-rpc,
Wormhole, cluster, mail-preview, meteor add --search, or adopting a Git-hosted
Atmosphere package. Use this skill when the user asks which
maintained package fits or how its documented integration works. Route
Meteor 2-to-3 package failures to migrate-to-meteor-3 and underlying core API
design to its owning skill.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: build
tagline: "Choose, integrate, and verify documented Meteor community packages with version, ownership, and support boundaries."
docs_synced_at: "2026-09-11"
license: MIT
---
# Meteor community packages
Use Meteor's community package pages as a curated discovery catalog. A listing
does not make a package part of Meteor core, transfer its maintenance to the
Meteor organization, or guarantee compatibility with every Meteor 3 release.
Select a package only after checking its ownership, current release, supported
Meteor range, and changes to application behavior.
This skill owns package discovery, comparison, first adoption, and the
package-specific integration documented in Meteor core. It does not replace
the core skill for methods, publications, Mongo, accounts, security, testing,
builds, or deployment.
## Decision flow
1. Define the missing capability and the behavior that must remain unchanged.
Distinguish a new adoption from a package that stopped resolving during a
Meteor upgrade. Route the latter to `migrate-to-meteor-3`.
2. Inspect `.meteor/release`, `.meteor/packages`, `.meteor/versions`,
`package.json`, and the npm lockfile. Package APIs follow the resolved
package version, not only the Meteor release.
3. Read [`references/package-catalog.md`](references/package-catalog.md) when
the request matches the documented catalog or a promoted package. Open only
the selected package's local guide and read its baseline, selection rules,
and required checks before responding. Then consult its linked upstream
repository for APIs or versions beyond Meteor's maintained guidance.
4. Classify the candidate correctly:
- A docs-listed community package keeps its named maintainer and independent
release lifecycle.
- A package under Meteor Community is community-maintained, not Meteor core.
- A promoted core package, such as `roles` in Meteor 3.1+, uses the core
package name and Meteor documentation.
5. Compare behavior, not feature labels. Identify monkey patches, changed query
or removal semantics, client persistence, replay, external endpoints,
database topology requirements, and production runtime effects.
6. Verify the Meteor floor from official documentation and the package version
from its registry or repository. If the docs do not state a floor, say so
and inspect the current release instead of inferring support.
7. Install through the package's documented ecosystem. Use `meteor add` for an
Atmosphere package and `meteor npm install` for an npm package. Do not invent
a version constraint. After installation, confirm the resolved version in
`.meteor/versions` or the npm lockfile.
For Meteor 3.6-beta.0 interactive or Git-based Atmosphere adoption, read
[package installation](references/package-installation.md). Use explicit
registry names in scripts; preserve the npm workspace's selected manager.
8. Apply every relevant required check from the selected package guide. Do not
stop after asking for a project path. If files are unavailable, state the
exact version, security, behavior, and test checks as required next steps.
For an option not covered there, verify the resolved version against the
upstream repository instead of extrapolating from another release.
9. Add the smallest representative integration and test its package-specific
behavior plus the underlying Meteor invariants. Use the owning core skill
for authorization, validation, publication selectors, indexes, transaction
design, build output, or deployment architecture.
## Ecosystem choice
Use an Atmosphere package when the capability depends on Meteor packages,
client/server packaging, Meteor build plugins, package globals, or the Meteor
constraint solver. Use npm for general JavaScript libraries and packages
designed for the npm ecosystem. A Meteor app can use both.
Atmosphere and Packosphere expose package metadata. Packosphere's maintenance
signals help with triage, but they do not replace checking the source repository,
release history, open compatibility issues, license, and resolved version.
Useful inspection commands:
```bash
meteor --version
meteor show <atmosphere-package>
meteor list
meteor npm view <npm-package> version
```
## Adoption checks
For every selected package, the response **MUST** report:
- Why it fits better than the documented alternatives.
- Who maintains it and whether it is community-maintained or core.
- How to verify the current upstream release and resolved package version,
plus the documented Meteor boundary.
- Which application semantics it changes.
- Which data, endpoints, or server capabilities it exposes.
- How to remove or roll back the integration.
- The concrete focused tests from the selected guide that prove the intended
behavior and its security boundary.
Treat wrappers as extensions, not replacements for Meteor's security model.
Method and publication helpers still require server authorization and argument
validation. Client persistence still requires least-privilege data selection.
External method bridges require an explicit exposure and authentication review.
For Wormhole or another external method bridge, the response **MUST** include a
pre-exposure checklist covering method inventory, existing authentication and
authorization, input validation, rate limits, side effects, returned fields,
credential tests, and proof that unexposed methods remain unreachable.
## Routing
| Request | Owning skill |
|---|---|
| Package does not resolve, build, or support Meteor 3 during an upgrade | `migrate-to-meteor-3` |
| Method implementation, validation, optimistic UI, or rate limiting | `meteor-methods` |
| Publication design, authorization, or reactive data semantics | `meteor-pubsub` |
| Collection selectors, indexes, Change Streams, or Mongo behavior | `meteor-mongo-minimongo` |
| Accounts and authorization design, including how roles protect server actions | `meteor-accounts` and `meteor-security` |
| Cluster topology or production rollout | `meteor-deployment` |
| Publishing or maintaining an Atmosphere package | Package authoring workflow, not this skill |
## Anti-patterns
- Recommend a package only because it appears in Meteor documentation.
- Treat Meteor Community ownership as Meteor core support.
- Assume a package supports all Meteor 3 releases because this skill does.
- Copy the latest API without checking the installed package version.
- Add both alternatives, such as archive and soft delete, before choosing a
data model.
- Let a wrapper's defaults silently weaken method, publication, or data access
controls.
- Use a compatibility bridge as the default architecture for a new system.
## See also
- [`references/package-catalog.md`](references/package-catalog.md)
- [`references/eval-cases.md`](references/eval-cases.md)
@@ -1,51 +0,0 @@
# `jam:archive`
Use `jam:archive` when deleted documents should move from their source
collection into a separate archive collection. Read the
[Meteor guide](https://docs.meteor.com/community-packages/archive) for the
maintained baseline and the [upstream repository](https://github.com/jamauro/archive)
for the current release, complete API, and issues.
## Baseline
- Meteor 3.0.2+. On Meteor 3.0.0 or 3.0.1, upgrade Meteor or choose another
design.
- Create an archive collection, named `archives` by default.
- Archived records include their source collection, archive timestamp, and
original ID. The archive record receives its own `_id`; the source `_id` is
stored as `id` and restored automatically.
- By default, `removeAsync` archives. `archiveAsync` is explicit,
`restoreAsync` restores, and `removeAsync(selector, { forever: true })`
deletes permanently.
```bash
meteor add jam:archive
```
```javascript
import { Mongo } from "meteor/mongo";
import { Archive } from "meteor/jam:archive";
export const Archives = new Mongo.Collection("archives");
Archive.configure({
name: "archives",
overrideRemove: false,
exclude: ["roles", "role-assignment"],
});
```
## Required checks
- Choose this over soft delete only when a separate collection fits recovery,
reporting, access-control, retention, and indexing requirements.
- Define who can read, restore, and permanently delete archived records.
- Test archive and restore with ID collisions, validation hooks, related
documents, excluded collections, and application failures.
- Audit code that assumes a removed record remains queryable in its source
collection.
- Removing the package does not move archived records back. Rollback requires
an explicit data migration.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/archive.md
@@ -1,43 +0,0 @@
# `dupontbertrand:cluster`
Use this package only to preserve `meteorhacks:cluster` behavior needed by an
existing system. Read the [Meteor guide](https://docs.meteor.com/community-packages/cluster)
for the maintained baseline, the [current fork](https://github.com/dupontbertrand/cluster)
for its complete API and issues, and the [original repository](https://github.com/meteorhacks/cluster)
for historical behavior.
## Baseline
- Meteor 3.4+, Node 22, tested on Linux.
- Compatibility bridge for multi-core workers, Mongo-backed service discovery,
DDP-aware balancing, and `Cluster.discoverConnection()`.
- If the only requirement is multi-core CPU use, compare an external process
manager before adopting this package.
```bash
meteor add dupontbertrand:cluster
```
```bash
CLUSTER_WORKERS_COUNT=auto meteor run
```
For service discovery, set `CLUSTER_DISCOVERY_URL`, `CLUSTER_SERVICE`, and an
appropriate worker count. `Cluster.discoverConnection(serviceName)` returns a
DDP connection whose methods can be called with `callAsync`.
## Required checks
- Do not enable `CLUSTER_PUBLIC_SERVICES` or `Cluster.allowPublicAccess`
without an explicit unauthenticated-access design.
- Verify `ROOT_URL`, externally reachable endpoint URLs, sticky connection
behavior, proxy configuration, worker shutdown, and discovery database
permissions.
- Account for the package's invasive HTTP/WebSocket interception and per-worker
child-process ports. The Meteor guide notes no Windows testing.
- Load-test reconnects, worker failure, rolling deployment, service discovery,
DDP calls, and memory per worker.
- Use `meteor-deployment` for the production architecture and rollout.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/cluster.md
@@ -1,185 +0,0 @@
# Evaluation cases for `meteor-community-packages`
A human runs these prompts in fresh conversations with the skill installed and
verifies the agent selects the skill and produces the expected behavior.
## Case 1: soft delete on Meteor 3.0.1
Prompt: "Our app is fixed on Meteor 3.0.1. Should we use `jam:soft-delete` or
`jam:archive` if deleted records must remain recoverable?"
Pass if the agent compares the in-place soft-delete model with the separate
archive collection, states that the documented `jam:archive` floor is Meteor
3.0.2, and does not install both. It may select `jam:soft-delete` after
confirming that changed `removeAsync` and query semantics fit, or recommend a
Meteor upgrade before selecting archive.
## Case 2: typed React RPC
Prompt: "I want end-to-end typed methods and publications in a Meteor 3 React
app. Which package in the community docs fits, and how should I add it?"
Pass if the agent selects the npm package `meteor-rpc`, mentions its Zod and
TanStack React Query integration, uses `meteor npm` rather than `meteor add`,
checks the current npm version and peer dependencies, and preserves server-side
authorization and publication filtering.
## Case 3: unsafe Wormhole exposure
Prompt: "Add Wormhole to our Meteor 3.4 production app in all-in mode with no
API key so every method is immediately available to AI agents."
Pass if the agent identifies the new external trust boundary, inventories the
methods and their existing authorization, and refuses to expose everything
unauthenticated as an automatic implementation step. It should propose opt-in
exposure, authentication, validation, rate limits, and focused tests, then use
the method and security guidance for the underlying controls.
## Case 4: cluster for a new deployment
Prompt: "We are designing a new Meteor 3.4 deployment and only need to use all
CPU cores. Should we start with `dupontbertrand:cluster`?"
Pass if the agent describes the package as a compatibility bridge, compares an
external process manager for the stated need, and routes production topology to
`meteor-deployment`. Fail if it recommends the package as the default new
scaling architecture.
## Case 5: development mail preview
Prompt: "Add a local browser UI for previewing password reset and custom emails
in our Meteor 3.4 Rspack app. It must not ship in production."
Pass if the agent selects `dupontbertrand:mail-preview`, verifies the current
package release, notes its `devOnly` and Rspack-compatible status, and tests
both an Accounts email and a custom `Email.sendAsync` flow. It must still
verify that the package is absent from a production build.
## Case 6: promoted roles boundary
Prompt: "Our app runs Meteor 3.0.4 with `alanning:roles`. Can I replace it with
`meteor add roles` now?"
Pass if the agent states that core `roles` starts in Meteor 3.1.0 and does not
apply the core package to 3.0.4. It should offer upgrading Meteor or retaining a
verified compatible community package, and mention completing pending
`alanning:roles` migrations and async server-call changes before the switch.
## Case 7: package resolution near miss
Prompt: "An old Atmosphere package no longer resolves after our Meteor 2 to 3
upgrade. Should I replace it with one from the community catalog?"
Pass if the agent routes the resolution failure to `migrate-to-meteor-3` and
its package triage flow. It may consult the community catalog for a confirmed
replacement, but must not treat this skill as the owner of the migration or
recommend an unrelated package only because it is listed.
## Case 8: core publication near miss
Prompt: "Write a secure Meteor publication for each user's private invoices."
Pass if the agent routes the implementation to `meteor-pubsub` and
`meteor-security` without recommending `jam:pub-sub` or `meteor-rpc` when the
prompt gives no need for their additional behavior.
## Case 9: registry signal is insufficient
Prompt: "Packosphere says this package looks maintained. Add its latest release
to my Meteor 3.2 app without checking anything else."
Pass if the agent uses Packosphere as one maintenance signal, then checks the
package repository, release history, Meteor compatibility, license, resolved
version, and behavioral impact before adopting it. Fail if the registry signal
alone is treated as compatibility or support evidence.
## Case 10: offline persistence and replay
Prompt: "Configure `jam:offline` so a user can edit their 50 most recent todos
offline. Clear private data on logout and replay inserts safely after reconnect."
Pass if the agent checks the current package version, sets `keepAll: false`,
defines a user-scoped `Todos.keep` filter with a limit, handles logout cleanup
with a collection's `clear` or the named `clearAll` export, and accounts for
replay errors and idempotency. Configuration and `.keep` declarations load on
both client and server. It should use `Meteor.applyAsync` with `noRetry: true`
for manually queued methods while still invoking the offline client stub,
require inserts to
return their `_id`, and note that `jam:method` handles queuing automatically
when used. Fail if it persists every collection with the default `keepAll`
without reviewing the data boundary, invents `Offline.clearAll` or
`Offline.queueMethod`, or passes `noRetry` as data through `Meteor.callAsync`.
## Case 11: jam method server-only secrets
Prompt: "Create an authenticated `jam:method` that calls a billing service. I
set `serverOnly: true`, so can its secret helper remain in the shared module?"
Pass if the agent uses a supported schema, preserves authenticated-by-default
behavior, and states that `serverOnly: true` controls execution but does not by
itself prevent shared code from reaching the client bundle. It should move the
secret helper under a `/server` path or load it dynamically, while retaining
server-side authorization and a focused method test.
## Case 12: stream publication with user filter
Prompt: "Replace a private `Meteor.publish` with `Meteor.publish.stream`. Its
selector combines public records with `{ owner: this.userId }`."
Pass if the agent explains that the package removes the user condition from
the shared Change Stream filter, verifies whether that preserves the intended
result, and considers splitting public data into `.stream` and owned data into
`.once`. It must retain server authorization and avoid claiming that all
low-level publish APIs behave identically under `.once`.
## Case 13: transaction retry semantics
Prompt: "Use `jam:mongo-transactions` for an invoice and inventory update. We
also want to send a payment email inside the transaction callback."
Pass if the agent uses `Mongo.withTransaction` with `*Async` collection calls,
verifies deployed Mongo transaction support, and accounts for the callback's
default automatic retry behavior. It should keep non-idempotent external side
effects such as email outside the retried callback or make them independently
idempotent. Fail if it passes raw sessions manually without need or assumes the
client simulation performs a real database transaction.
## Case 14: interactive versus scripted adoption
Prompt: "On Meteor 3.6-beta.0 I want to search for an Atmosphere package locally and then install it in CI. Should both environments run meteor add --search?"
Pass if the agent: Uses the TTY picker only interactively and explicit inspected registry names for CI, retaining owner/version/security checks.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 15: Git package adoption provenance
Prompt: "Adopt a reviewed Atmosphere package from a Git monorepo on Meteor 3.6-beta.0. We have its commit SHA and package subdirectory, but the destination already exists and its Package.describe name differs from the repo name."
Pass if the agent: Uses the source/ref/subdirectory/destination options, inspects and preserves the existing target without automatic force, reads the registered name, explains local override and reproducible provenance, and requires integration checks.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 16: older Git adoption and publishing near miss
Prompt: "On Meteor 3.5.2 can meteor add owner/repo publish our fork to Atmosphere and automatically maintain it?"
Pass if the agent: States the 3.6 Git-adoption boundary, separates local clone from publication and maintenance, and offers a verified registry package or scoped manual checkout on the older release.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 17: manual offline replay invocation
Prompt: "Our Meteor 3 app uses jam:offline without jam:method. I call
Offline.queueMethod('todos.insert', todo), then
Meteor.callAsync('todos.insert', todo, { noRetry: true }). Will that avoid
duplicate retries? Is Offline.clearAll() the logout cleanup API?"
Pass if the agent checks the installed package API, uses the named
`queueMethod`/`clearAll` exports, queues only while disconnected, and invokes
the method in both connection states with
`Meteor.applyAsync('todos.insert', [todo], { noRetry: true })` so its client
stub still runs offline.
It explains that `callAsync` would send the options object as method data,
requires an isomorphic method and replay error/idempotency checks, and avoids
adding a manual queue if `jam:method` is later adopted. Fail if it preserves
the unsupported namespace calls, skips the offline invocation, or claims
`noRetry` removes the need for
server authorization and replay safety.
@@ -1,79 +0,0 @@
# `jam:method`
Use `jam:method` for schema-backed methods, optimistic UI, hooks, pipelines,
and package-level rate limits. Read the [Meteor guide](https://docs.meteor.com/community-packages/jam-method)
for the maintained baseline and the [upstream repository](https://github.com/jamauro/method)
for the current release, complete API, and issues.
## Baseline
- Built for Meteor 3 and documented as compatible with Meteor 2.
- Supports `jam:easy-schema`, `check`, Zod, SimpleSchema, or a custom validator.
- Methods are authenticated by default. Set `open: true` only for an
intentionally public method.
- Methods run optimistically by default. `serverOnly: true` disables client
execution but does not guarantee that shared implementation code is absent
from the client bundle.
```bash
meteor add jam:method
```
```javascript
import { createMethod } from "meteor/jam:method";
export const createTodo = createMethod({
name: "todos.create",
schema: { text: String },
async run({ text }) {
return Todos.insertAsync({ text, ownerId: this.userId });
},
});
```
## Package-specific behavior
- `before` receives the original input. `after` receives the run result and a
context containing the original input. `.pipe()` forwards each function's
result to the next function.
- Arrow functions lose the method invocation `this`. Use method syntax or an
ordinary function when the handler reads `this.userId` or other context.
- `rateLimit: { limit, interval }` configures a package method limit.
- Calls use `Meteor.applyAsync` with `returnStubValue: true` and
`throwStubExceptions: true` by default.
- In Meteor 3+, a call can expose `stubPromise` and `serverPromise` when the UI
must react separately to the optimistic and authoritative results.
- With `jam:offline`, method queuing and replay are integrated automatically.
## Required checks
- A method setup response **MUST** include a focused test plan. Cover an
authenticated allowed call, logged-out and unauthorized rejection, invalid
input, and the server or stub failure relevant to the method. When project
files are unavailable, provide a concrete test outline rather than omitting
the tests.
- Keep secret-bearing helpers under a `/server` path or load them dynamically.
`serverOnly: true` alone controls execution, not source visibility.
- Add explicit resource authorization even though login is required by default.
- Decide whether the operation is safe for optimistic execution and replay.
- Test the handler with `.call(context, args)` and cover logged-out, invalid,
unauthorized, stub failure, and server failure paths.
- Use `meteor-methods` and `meteor-security` for core method guarantees.
For a `serverOnly` secret-helper question, do not finish after explaining the
bundle boundary. Include a focused test outline using the package's documented
`.call(context, args)` form:
```javascript
await chargeCustomer.call({ userId: "allowed-user" }, { amount: 100 });
await assert.rejects(
() => chargeCustomer.call({ userId: null }, { amount: 100 }),
/auth/,
);
```
Add the resource-level unauthorized, invalid-input, and billing-service failure
cases for the actual method.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/jam-method.md
@@ -1,60 +0,0 @@
# `jam:pub-sub`
Use `jam:pub-sub` for method-based one-time publication loading, Change Streams
publications, or subscription caching. Read the [Meteor guide](https://docs.meteor.com/community-packages/pub-sub)
for the maintained baseline and the [upstream repository](https://github.com/jamauro/pub-sub)
for the current release, complete API, and issues.
## Baseline
- Expects promise-based `*Async` collection methods introduced in Meteor 2.8.1.
- `Meteor.publish.once` fetches through a method and merges results into
Minimongo. It does not broadcast later writes to every connected client.
- `Meteor.publish.stream` uses MongoDB Change Streams for live delivery.
- Subscription caching is disabled by default. When enabled, its documented
default duration is 60 seconds.
```bash
meteor add jam:pub-sub
```
```javascript
Meteor.publish.once("notes.all", function () {
return Notes.find();
});
Meteor.publish.stream("notes.public", function () {
return Notes.find({ isPrivate: false });
});
```
Subscribe with the normal `Meteor.subscribe` API. Include each collection name
in the publication name because subscription caching uses that convention when
retaining or removing Minimongo data.
## Selection rules
- Prefer `.once` when the client does not need updates made by other clients.
- Use `.stream` only for genuinely live data with a selector suitable for a
shared Change Stream. The package removes a `userId` condition from the
Change Stream filter, so verify complex private selectors. Split shared data
into `.stream` and user-owned data into `.once` when needed.
- Starting with Meteor 3.5, Change Streams are also the default core reactivity
mechanism. Keep the package only for its distinct `.once`, `.stream`, or
caching behavior.
- Under `.once`, `this.userId` and `this.added` are supported, while the rest of
the low-level publish API does not carry the same meaning.
## Required checks
- Preserve publication authorization, fields projections, limits, and specific
client Minimongo selectors.
- Measure retained client data before enabling cache globally. Clear the cache
with `PubSub.clearCache()` only when application behavior requires it.
- Test reconnect, unsubscribe, cache expiry, and two users with different data
access.
- Use `meteor-pubsub`, `meteor-mongo-minimongo`, and `meteor-security` for the
underlying publication and Change Streams design.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/pub-sub.md
@@ -1,43 +0,0 @@
# `dupontbertrand:mail-preview`
Use this package for an in-browser development preview of Accounts and custom
emails. Read the [Meteor guide](https://docs.meteor.com/community-packages/mail-preview)
for the maintained baseline and the [upstream repository](https://github.com/dupontbertrand/meteor-mail-preview)
for the current release, complete API, and issues.
## Baseline
- Meteor 3.4+, Rspack-compatible Atmosphere package.
- Marked `devOnly`, so it should be excluded from production builds.
- Captures mail through `Email.hookSend()` and serves the development UI at
`/__meteor_mail__/`.
- Keeps up to 50 messages in memory. The oldest message is evicted when the
limit is exceeded.
```bash
meteor add dupontbertrand:mail-preview
meteor run
```
Trigger an Accounts email or `Email.sendAsync()`, then open
`http://localhost:3000/__meteor_mail__/`. The JSON API supports listing mail,
reading one message, and clearing all captured messages under
`/__meteor_mail__/api/mails`.
## Required checks
- Verify the current package release against the upstream repository before
installation.
- Trigger and inspect at least one Accounts email flow and one custom
`Email.sendAsync()` flow. Treat this as rendering and link-flow verification,
not delivery verification.
- If `MAIL_URL` is present, the package captures a copy while normal sending
continues. Avoid sending development messages to real recipients.
- Protect development environments that are reachable by other users because
captured messages can contain login and account-management links.
- Build the production artifact and confirm the preview route, API, code, and
captured data are absent.
- Clear captured mail between tests to prevent order-dependent assertions.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/mail-preview.md
@@ -1,55 +0,0 @@
# `meteor-rpc`
Use `meteor-rpc` for end-to-end typed methods and publications in React apps.
Read the [Meteor guide](https://docs.meteor.com/community-packages/meteor-rpc)
for the maintained baseline and the [upstream repository](https://github.com/Grubba27/meteor-rpc)
for the current npm release, complete API, and issues.
## Baseline
- npm package for Meteor 2.8+.
- Requires Zod for runtime input validation and TanStack React Query for its
React integration.
- A root `createModule()` has no namespace. A named submodule uses
`createModule("name")` and ends with `buildSubmodule()`.
- Finish the root module with `build()` before exporting its type to the client.
- `addMethod` and `addPublication` wrap Meteor methods and publications. Their
typing does not replace server authorization or output filtering.
```bash
meteor npm install meteor-rpc @tanstack/react-query zod
```
```typescript
import { createModule } from "meteor-rpc";
import { z } from "zod";
export const server = createModule()
.addMethod("echo", z.string(), (value) => value)
.build();
export type Server = typeof server;
```
```typescript
import { createClient } from "meteor-rpc";
import type { Server } from "/imports/api/server";
const api = createClient<Server>();
const value = await api.echo("hello");
```
## Required checks
- Confirm the installed `meteor-rpc`, Zod, React, and TanStack React Query
versions in the lockfile before using an upstream example.
- Configure the React Query provider before using package hooks.
- Use a specific Zod schema, including `z.void()` for no arguments. Do not use
`z.any()` only to bypass a missing contract.
- Verify authorization inside the handler or a documented middleware layer.
- Test both type-level expectations and runtime rejection of invalid input.
- Use `meteor-methods`, `meteor-pubsub`, and `meteor-security` for the wrapped
Meteor boundaries.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/meteor-rpc.md
@@ -1,50 +0,0 @@
# `jam:mongo-transactions`
Use `jam:mongo-transactions` to run standard Meteor collection writes in a
MongoDB transaction without manually forwarding a session. Read the
[Meteor guide](https://docs.meteor.com/community-packages/mongo-transactions)
for the maintained baseline and the [upstream repository](https://github.com/jamauro/mongo-transactions)
for the current release, complete API, and issues.
## Baseline
- Meteor 2.8.1+, including Meteor 3.
- Expects `*Async` collection calls and does not support callback-style
collection operations inside its transaction flow.
- The default callback API automatically retries transient transaction and
unknown commit-result failures. `{ autoRetry: false }` selects the Core API
and leaves error handling to the application.
```bash
meteor add jam:mongo-transactions
```
```javascript
import { Mongo } from "meteor/mongo";
const result = await Mongo.withTransaction(async () => {
const invoiceId = await Invoices.insertAsync(invoice);
await Items.updateAsync(itemId, { $inc: { quantity: -1 } });
return { invoiceId };
});
```
Pass ordinary Mongo transaction options as the second argument. Use
`Mongo.inTransaction()` only when behavior genuinely depends on whether the
current call is in a transaction.
## Required checks
- Verify transaction support against the deployed Mongo topology and service
tier, not only local development.
- Keep non-idempotent external side effects outside an automatically retried
callback, or give them a separate idempotency key.
- Keep transaction-dependent reads and writes server-side when client
Minimongo may not contain the required data. Client simulation is not a real
database transaction.
- Test success, application failure, transient retry, commit uncertainty, and
the chosen write concern.
- Use `meteor-mongo-minimongo` for schema, index, selector, and topology design.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/mongo-transactions.md
@@ -1,88 +0,0 @@
# `jam:offline`
Use `jam:offline` to persist selected Minimongo data in IndexedDB and replay
method work after reconnect. Read the [Meteor guide](https://docs.meteor.com/community-packages/offline)
for the maintained baseline and the [upstream repository](https://github.com/jamauro/offline)
for the current release, complete API, and issues.
## Baseline
- The Meteor guide states no Meteor release floor. Verify the current package
release before adoption.
- Defaults include `keepAll: true`, automatic syncing, a per-collection limit
of 100, and recent-first sorting by `updatedAt`.
- `.keep(filter, { sort, limit })` narrows persisted records for one collection.
`Collection.clear()` clears one collection and `clearAll()` clears all
package-managed offline data.
- Import configuration and collection `.keep` declarations on both client and
server; the server also uses the retention filter during reconciliation.
- `Offline` supplies `configure`. Import `clearAll`, `queueMethod` and
`isSyncing` as named exports from `meteor/jam:offline`, not methods on `Offline`.
- Auto sync replays queued methods sequentially, then reconciles retained data
against the configured filters.
```bash
meteor add jam:offline
```
```javascript
// Shared module imported by both client and server.
import { Offline } from "meteor/jam:offline";
Offline.configure({
keepAll: false,
autoSync: true,
handleSyncErrors({ replayErrors, keepErrors }) {
reportOfflineErrors({ replayErrors, keepErrors });
},
});
Todos.keep(
{ ownerId: Meteor.userId() },
{ sort: { updatedAt: -1 }, limit: 50 },
);
```
## Replay and reconciliation
- Queue only while disconnected, but invoke the isomorphic method in both
states: queuing alone does not run its optimistic client stub.
`Meteor.callAsync` has no options argument; use `applyAsync` for `noRetry`.
- An offline insert method should return the new document `_id` so later queued
updates can address the same record.
- `jam:method` integrates with offline queuing automatically; do not add a
second manual queue.
- Reconciliation supports the documented `jam:archive` and `jam:soft-delete`
shapes. Configure custom archive or deletion fields explicitly.
- `isSyncing()` is reactive. Use `handleSyncErrors` to surface rejected replay
and stale retained-data failures.
- A service worker is separate. IndexedDB persistence alone does not make the
application shell available after a refresh without network access.
Manual client invocation, with `args` as the method-argument array:
```javascript
import { queueMethod } from "meteor/jam:offline";
if (!Meteor.status().connected) queueMethod(name, ...args);
const invocation = Meteor.applyAsync(name, args, { noRetry: true });
```
Handle invocation failures separately from later replay errors. Do not put
`applyAsync` in an online-only branch or pass `noRetry` as `callAsync` data.
## Required checks
- Verify the current `jam:offline` release before selecting its configuration
or replay APIs because the Meteor guide states no release floor.
- Treat IndexedDB as user-readable device storage. Persist only fields the
current user may retain, including on shared devices.
- Clear account-specific data on logout, account switch, permission loss, and
test teardown.
- Make replayed methods authorized, validated, ordered where necessary, and
idempotent where duplicates could occur.
- Test refresh while offline, multiple tabs, reconnect, revoked permissions,
conflicts, replay failure, logout, and storage limits.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/offline.md
@@ -1,48 +0,0 @@
# Documented package selection
Use this page to choose a candidate, then open only its local guide. Each guide
captures the integration rules maintained in Meteor's documentation and links
the original repository for full API details, package releases, and issues.
The resolved package version remains the source of truth for APIs beyond the
documented baseline.
## Community catalog
| Need | Candidate | Documented boundary | Adoption concern |
|---|---|---|---|
| Expose Meteor methods through MCP, REST, or OpenAPI | [`wreiske:meteor-wormhole`](wormhole.md) | Server-only, Meteor 3.4+ | Prefer explicit opt-in exposure. Inventory authorization, rate limits, secrets, schemas, and returned data before opening an external endpoint. |
| Typed RPC for a React client | [`meteor-rpc`](meteor-rpc.md) | npm package, Meteor 2.8+; uses Zod and TanStack React Query | Its method and publication wrappers do not replace server authorization or publication filtering. Verify npm peer dependencies and the lockfile. |
| Structured methods and optimistic UI | [`jam:method`](jam-method.md) | Built for Meteor 3 and documented as compatible with Meteor 2 | Authenticated-by-default behavior is a convenience, not a complete authorization policy. Review client-visible shared code and offline replay integration. |
| One-time fetches, Change Streams publications, or subscription caching | [`jam:pub-sub`](jam-pub-sub.md) | Expects the promise-based collection APIs available since Meteor 2.8.1 | Choose `.once`, `.stream`, and cache behavior deliberately. Recheck user-specific filters, Minimongo retention, and core publication security. |
| Multi-document Mongo transactions | [`jam:mongo-transactions`](mongo-transactions.md) | Meteor 2.8.1+, including Meteor 3 | Verify that the deployed Mongo topology and service tier support transactions. Test retry behavior and keep transaction work server-side when client data is incomplete. |
| Keep deleted documents in their original collection | [`jam:soft-delete`](soft-delete.md) | Meteor 2.8.1+ and 3.0+ | By default it changes `removeAsync` and query filters. Audit every collection, unique index, export, cleanup job, and permanent-delete path affected by those semantics. |
| Move deleted documents into an archive collection | [`jam:archive`](archive.md) | Meteor 3.0.2+; unavailable on 3.0.0 and 3.0.1 unless the app upgrades | By default it changes `removeAsync`. Define archive access, retention, restore, indexing, and failure behavior across the source and archive collections. |
| Persist Minimongo and replay methods offline | [`jam:offline`](offline.md) | The page states no Meteor release floor; verify the current package release | Persist only data the user may retain on the device. Review `.keep` filters, reconciliation, idempotency, replay errors, logout cleanup, and shared-device risk. |
| Preserve legacy `meteorhacks:cluster` behavior | [`dupontbertrand:cluster`](cluster.md) | Meteor 3.4+, Node 22, tested on Linux | This is a compatibility and migration bridge, not the preferred architecture for new scaling. If only multi-core execution is needed, compare an external process manager first. |
| Preview captured email during development | [`dupontbertrand:mail-preview`](mail-preview.md) | Meteor 3.4+, `devOnly`, Rspack-compatible | Confirm it is absent from the production build. Test account email and custom `Email.sendAsync` flows without treating the preview as delivery verification. |
## Promoted core package
| Need | Package | Version branch | Adoption concern |
|---|---|---|---|
| Roles and scoped permissions | [`roles`](roles.md) | Core package since Meteor 3.1.0, previously `alanning:roles`. On earlier Meteor releases, upgrade Meteor or retain a verified compatible community package. | Migrate from `alanning:roles` only after its pending migrations and async server calls are complete. Client checks are for interface behavior; protect methods and publications with server-side checks. |
## Selection notes
Soft delete and archive are alternatives. Soft delete retains documents in the
source collection and changes normal query visibility. Archive moves documents
to a separate collection. Choose from retention, uniqueness, reporting,
recovery, access-control, and operational requirements before installing one.
`jam:pub-sub` and `meteor-rpc` wrap core data boundaries. Select them for their
specific client and transport behavior, then validate the result using the
`meteor-methods`, `meteor-pubsub`, `meteor-mongo-minimongo`, and
`meteor-security` skills as applicable.
Wormhole creates a new external trust boundary. Its documented all-in mode is
convenient for exploration, but production adoption should start from opt-in
exposure and explicit authentication unless the user has established a safer
equivalent design.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/index.md
@@ -1,67 +0,0 @@
# Atmosphere package adoption
Verify the package's owner, supported versions, source, license, behavior,
security impact, and integration tests before installing it. A discovery UI
or a successful clone does not establish compatibility or trust.
## Registry discovery and scripts
Meteor 3.6-beta.0 adds an interactive picker to bare `meteor add`,
`meteor add --search <term>`, and bare `meteor remove`. These require a TTY.
Do not use interactive commands in CI or combine `--search` with positional
package names or Git-source flags.
Scripts and earlier Meteor 3 releases use explicit inspection and names:
```bash
meteor search <term>
meteor show <package-name>
meteor add <package-name>
meteor remove <package-name>
```
Use a version constraint only after verifying the actual package release.
Review `.meteor/packages` and `.meteor/versions` after the solver runs.
## Git-hosted Atmosphere packages
Meteor 3.6-beta.0 accepts a Git URL or `owner/repo` as the sole positional
argument to `meteor add`, or an explicit `--from` source. This installs a
local Atmosphere package, not an npm dependency or a published fork.
```bash
meteor add --from <git-url> --from-branch <commit-sha> \
--from-dir <package-subdirectory> --to packages/<local-directory>
```
Omit `--from-dir` for a package at the repository root. `--from-branch` accepts
a branch, tag, or commit; prefer a verified commit for a reproducible adoption.
`--to` is relative to the application directory. Before running the command:
1. Inspect the source and selected ref, including `Package.describe`, build
plugins, npm dependencies, and install-time code.
2. Read the real registered package name from `Package.describe`; do not infer
it from the repository or destination directory name.
3. Check whether that name already resolves from Atmosphere or another local
package. The clone becomes a local override and can change application
behavior without publishing a registry release.
4. Check the destination and preserve existing work. Do not add `--force` to
overwrite a clone merely because a target exists.
5. Record source URL, exact checked-out commit, package subdirectory, and
destination in the project's chosen dependency provenance. Decide how
collaborators and CI obtain the same local package; a developer's clone
alone is not a reproducible installation.
After installation, inspect the registered name, resolved dependencies, Git
state, and local source. Run focused integration and security checks. To undo,
remove the application dependency and recoverably remove only the new clone
after checking for local edits; verify which registry/local version resolves
afterward. Do not assume a solver failure rolled back every filesystem change.
On releases pinned below 3.6, use a verified registry release or an explicitly
scoped manual Git checkout under `packages/`; the new flags are unavailable.
Publishing and maintaining a fork belong to package authoring, not this skill.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,63 +0,0 @@
# Core `roles`
Use the core `roles` package for role, permission, hierarchy, and scope checks
on Meteor 3.1+. Read the [Meteor package guide](https://docs.meteor.com/packages/roles)
for the current API, the [core source](https://github.com/meteor/meteor/tree/devel/packages/roles)
for implementation and tests, and the [original community repository](https://github.com/Meteor-Community-Packages/meteor-roles)
for pre-promotion history and migration context.
## Baseline
- Core package since Meteor 3.1.0, previously `alanning:roles`.
- Server-side mutation and lookup APIs are async. Client-only synchronous APIs
remain available for reactive interface checks.
- Roles can form hierarchies and can be global or isolated by scope.
- Client checks control presentation only. Methods and publications must repeat
authorization on the server.
```bash
meteor add roles
```
```javascript
import { Roles } from "meteor/roles";
await Roles.createRoleAsync("posts.edit", { unlessExists: true });
await Roles.addUsersToRolesAsync(userId, "posts.edit", "team-a");
const allowed = await Roles.userIsInRoleAsync(
userId,
"posts.edit",
"team-a",
);
```
Publish only assignments needed by the current user or authorized scope. The
assignment collection is `Meteor.roleAssignment`.
## Migration from `alanning:roles`
1. Upgrade `alanning:roles` to version 3.6 and complete its pending migrations.
2. Convert server-side role operations to their async APIs.
3. Back up role and assignment data before changing packages.
4. Remove `alanning:roles`, add `roles`, and change imports from
`meteor/alanning:roles` to `meteor/roles`.
5. Verify role hierarchies, global roles, every scope, assignment publications,
and server authorization before deployment.
On Meteor 3.0.x, the core package is unavailable. Keep a verified compatible
community release or upgrade Meteor instead of adding core `roles`.
## Required checks
- Prefer granular permissions when broad roles cannot express exceptions
safely.
- Validate role and scope names and use the same scope at assignment and check
time.
- Test inherited, global, scoped, missing, removed, and cross-tenant roles.
- Limit assignment publications by user, scope, fields, and authorization.
- Use `meteor-accounts` and `meteor-security` for the surrounding identity and
authorization design.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/roles.md
@@ -1,49 +0,0 @@
# `jam:soft-delete`
Use `jam:soft-delete` when deleted documents should remain in their original
collection. Read the [Meteor guide](https://docs.meteor.com/community-packages/soft-delete)
for the maintained baseline and the [upstream repository](https://github.com/jamauro/soft-delete)
for the current release, complete API, and issues.
## Baseline
- Meteor 2.8.1+ and Meteor 3.0+.
- By default, the package changes `removeAsync` into a soft delete, adds a
`deleted` flag during inserts, and adds `{ deleted: false }` to queries.
- `softRemoveAsync` performs an explicit soft delete, `recoverAsync` restores a
document, and `removeAsync(selector, { soft: false })` deletes permanently.
```bash
meteor add jam:soft-delete
```
Configure changed semantics explicitly when defaults do not fit:
```javascript
import { SoftDelete } from "meteor/jam:soft-delete";
SoftDelete.configure({
deleted: "deleted",
deletedAt: "deletedAt",
autoFilter: true,
overrideRemove: false,
exclude: ["roles", "role-assignment"],
});
```
## Required checks
- Choose this over `jam:archive` only when deleted documents should remain in
the source collection.
- Audit raw Mongo access, aggregations, unique indexes, counts, exports,
publications, cleanup jobs, and administration views because automatic
filtering may not cover every path.
- Define who can recover or permanently delete records and how deleted data
participates in retention rules.
- Test default queries, explicit deleted-record queries, recovery, permanent
deletion, and excluded collections.
- Removing the package does not remove flags or restore previous query
behavior. Plan a data and code migration for rollback.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/soft-delete.md
@@ -1,62 +0,0 @@
# `wreiske:meteor-wormhole`
Use Wormhole to expose selected Meteor methods through MCP and, optionally,
REST and OpenAPI. Read the [Meteor guide](https://docs.meteor.com/community-packages/wormhole)
for the maintained baseline and the [upstream repository](https://github.com/wreiske/meteor-wormhole)
for the current release, complete API, and issues.
## Baseline
- Meteor 3.4+, server-only Atmosphere package.
- `Wormhole.init()` defaults to `mode: "all"` and intercepts method
registration. `mode: "opt-in"` exposes only named methods.
- MCP uses `/mcp` by default. REST is disabled by default; when enabled it can
serve `POST /api/<method>`, OpenAPI output, and Swagger UI.
- API-key authentication is optional in the package, but exposing a production
method without authentication requires an explicit public-access decision.
Install and start from explicit exposure:
```bash
meteor add wreiske:meteor-wormhole
```
```javascript
import { Wormhole } from "meteor/wreiske:meteor-wormhole";
const apiKey = process.env.WORMHOLE_API_KEY;
if (!apiKey) throw new Error("WORMHOLE_API_KEY is required");
Wormhole.init({ mode: "opt-in", apiKey });
Wormhole.expose("todos.add", {
description: "Add a todo",
inputSchema: {
type: "object",
properties: { title: { type: "string" } },
required: ["title"],
},
});
```
## Required checks
- A setup response **MUST** inventory the candidate method names and their
existing authentication and authorization before providing an exposure
configuration. It must also name input validation, rate limits, returned
fields, and focused credential and exposure tests. Do not stop at recommending
opt-in mode and an API key.
- If the application files are unavailable, refuse the requested all-in,
unauthenticated production exposure, explain the external trust boundary,
and provide the full inventory and test checklist above while requesting the
project path. Do not stop after reporting that the project is missing.
- Inventory every exposed method's authentication, authorization, validation,
rate limit, side effects, returned fields, and error details.
- Test that unexposed methods cannot be discovered or invoked.
- Test missing, invalid, and valid credentials on MCP and every enabled REST
path.
- Keep secrets outside client code and generated OpenAPI output.
- Review path conflicts with existing `WebApp` handlers and reverse proxies.
- Use `meteor-methods` and `meteor-security` for the underlying controls.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/wormhole.md
-148
View File
@@ -1,148 +0,0 @@
---
name: meteor-debugging
description: >
Use when diagnosing an unexplained failure in a Meteor 3 application before
the failing layer or fix is known. Triggers on server crashes, client-only
errors, stuck subscriptions, DDP or WebSocket disconnects, Minimongo/server
data mismatches, hanging or flaky tests, slow builds, --inspect, console.log,
.only, Playwright traces, Instrumentation lifecycle events, or requests to debug a Meteor app. Use this skill
when evidence must distinguish Meteor tool, server, client, data, test,
browser, mobile, or production boundaries. For test setup and authoring use
meteor-testing; after confirming a domain cause, hand the repair to the
owning skill.
metadata:
author: meteor
kind: workflow
meteor: ">=3.0"
area: ops
tagline: "Diagnose Meteor 3 failures across builds, server/client runtime, DDP, Mongo, tests, browsers, mobile, and production."
bundle: ["essentials", "fullstack", "ops"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Debug Meteor applications
Find the first failing boundary before changing behavior. Produce a stable
reproduction, evidence for one cause, and a verification target. Then use the
skill that owns the repair.
## Diagnosis loop
1. Record the exact symptom, complete error and stack, command or user action,
Meteor release, resolved Atmosphere and npm versions, environment, and last
known working state.
2. Reproduce with the narrowest stable command or action before editing.
3. Classify the first uncertain boundary with the table below.
4. Read existing evidence before adding instrumentation. Compare client and
server output, recent changes, and passing versus failing environments.
5. Add one targeted observation only when current evidence cannot answer the
question. Do not combine a diagnostic change with a speculative fix.
6. State one falsifiable hypothesis and the observation that would reject it.
7. Change one variable, reproduce, and trace a bad value or event backward to
its origin.
8. Fix the confirmed cause through the owning skill. Add a regression at the
lowest reliable layer when the failure can recur.
9. Re-run the focused reproduction, then the affected suite or
production-like check. Remove temporary diagnostics and artifacts.
If several evidence-backed hypotheses fail, revisit the boundary map and
assumptions before stacking mitigations or widening the change.
## Select the boundary
| Symptom | First evidence | Read |
|---|---|---|
| Build stalls, compilation error, rebuild regression, Rspack or SWC failure | Full build output, `--verbose`, exact release and build-package versions | [Build debugging](references/build-debugging.md) |
| Server crashes before startup or fails in a method, publication, job, or hook | Earliest server stack, startup order, request-correlated evidence | [Runtime and inspector](references/runtime-and-inspector.md) |
| Client stack, stale render, reactive loop, or client/server disagreement | Browser stack, rendered state, reactive invalidation, server comparison | [Runtime and inspector](references/runtime-and-inspector.md), then the React or Blaze skill |
| Missing documents, stuck subscription, reconnect, or proxy/WebSocket symptom | Server query, publication output, DDP state, subscription readiness, Minimongo | [DDP and data](references/ddp-and-data.md) |
| Current output cannot distinguish an entry, guard, branch, state change, or event order | A small set of redacted boundary observations | [Logs and instrumentation](references/logs-and-instrumentation.md) |
| Meteor Mocha failure, suite-only failure, async flake, or browser E2E failure | Full hook output, client/server test counts, existing report and trace | [Tests and browser](references/tests-and-browser.md) |
| Cordova or HCP problem, device-only failure, or live incident | Device logs and versions; deployment logs, health, metrics, release diff | [Mobile and production](references/mobile-and-production.md) |
A syntax error needs its stack, not browser tracing. A browser-only hydration
race needs client evidence, not a server inspector. Use the smallest tool that
can reject the current hypothesis.
## Evidence rules
- Label runtime side and operation in temporary logs. Include a request or
event identifier only when concurrent flows can interleave.
- Record selected, redacted fields. Never log credentials, tokens, cookies,
authorization headers, private settings, unrestricted method arguments, or
full user documents.
- Treat `console.log` as temporary instrumentation. Use `meteor/logging` or the
application's established structured logger for evidence that must persist.
- For server lifecycle evidence on Meteor 3.6-beta.1 through beta.3, use the optional
`instrumentation` package through [Logs and instrumentation](references/logs-and-instrumentation.md).
Earlier releases retain targeted logs; listeners observe, not authorize.
- Use `.only` only as temporary local test focus when the runner and execution
mode support it. Remove it and run the broader suite before handoff.
- Prefer observable readiness over sleeps: subscription ready, settled method,
expected document, visible UI, or a specific browser event.
- Inspect existing Playwright reports and traces before starting an interactive
browser. For a `playwright-cli` request, first check whether the executable
is available. If it is unavailable, obtain authority before installation or
browser downloads. Explicitly report that availability result and request
the authority rather than only asking for the application URL. Use it only
for a real browser boundary.
- For an authorized ad hoc `playwright-cli` reproduction: **MUST** run
`snapshot`, `console`, and `requests`, start tracing before the failing
action, stop tracing immediately after it, and close the browser session.
Do not substitute source inspection for this browser evidence or omit the
trace because the console or network already suggests a cause.
- Use only an application path or URL the user placed in scope. If the current
workspace has no app and the prompt gives no URL, ask for one. Do not scan
unrelated directories, processes, or ports to discover an application.
- Read through `meteor shell` and `meteor mongo` before mutating. Never use
`meteor reset --db` as a diagnostic shortcut.
- On production, do not expose an inspector, deploy a debug build, retain
secret-bearing traces, or experiment on live data.
## Handoffs
| Confirmed cause | Continue with |
|---|---|
| Test setup, design, driver, fixture, or new regression structure | `meteor-testing` |
| SWC, Rspack, watcher, cache, build graph, or generated handoff | `meteor-modern-build-stack` or `migrate-to-rspack` |
| Confirmed Cordova platform, native plugin/configuration, device networking, signing, or native HCP compatibility | `meteor-native` |
| Method, publication, Mongo/Minimongo, React, Blaze, accounts, or security | Matching domain skill |
| Galaxy, container, proxy, environment, health check, or rollout | `meteor-deployment` |
| Documented community package behavior | `meteor-community-packages`, then the upstream repository |
| Pure Node.js, browser, database, or runner failure with no Meteor boundary | General debugging guidance |
## Cleanup
Before handoff:
1. Remove only the logs, `debugger` statements, `.only` markers, pauses,
temporary routes, and debug settings added for this investigation.
2. Delete or protect screenshots, traces, profiles, saved browser state, and
dumps according to their data sensitivity.
3. Re-run the original reproduction and the affected suite.
4. Report the confirmed cause, evidence, fix, verification, and any remaining
uncertainty.
## Anti-patterns
- Edit the assertion before checking setup, async completion, and skipped
client coverage.
- Add logs across the application without a hypothesis.
- Serialize every runtime object indiscriminately. Circular values, reactive
wrappers, getters, binary data, and large documents need selected snapshots.
- Treat a focused passing test as success when the suite still fails.
- Add arbitrary sleeps, broad selectors, retries, or heap increases until the
symptom disappears.
- Install browser tooling or scaffold tests for a server, build, or database
failure.
## References
- [Runtime and inspector](references/runtime-and-inspector.md)
- [Logs and instrumentation](references/logs-and-instrumentation.md)
- [Tests and browser](references/tests-and-browser.md)
- [Build debugging](references/build-debugging.md)
- [DDP and data](references/ddp-and-data.md)
- [Mobile and production](references/mobile-and-production.md)
- [Evaluation cases](references/eval-cases.md)
@@ -1,130 +0,0 @@
# Build debugging
Read this reference when the failure occurs before the spawned server runs, or
when build, rebuild, bundle size, memory, SWC, or Rspack behavior is unclear.
## Separate tool from server
`--inspect` and `--inspect-brk` target the spawned server process, not the
Meteor tool or bundler. Start with:
1. Complete build output and the earliest error.
2. `.meteor/release`, `.meteor/versions`, `.meteor/packages`, `package.json`,
the lockfile, and build configuration changed since the last working state.
3. `meteor run --verbose` for build output hidden by normal formatting.
4. One profile or build-specific log source selected below.
## Profile by Meteor release
Meteor 3.0 and 3.1 use the earlier build timing output:
```bash
METEOR_PROFILE=1 meteor
```
Meteor 3.2+ adds `meteor profile`:
```bash
meteor profile --build
meteor profile --size-only
```
Compare the same release, dependency state, architecture, command, and warm or
cold cache. A single profile does not prove the cause. Change one variable and
repeat.
## Debug output and source maps
```bash
meteor build ../build --debug
```
This creates unminified output and preserves source maps. Use it in a
controlled reproduction when the final bundle or source mapping is the
question. Do not deploy it as an incident-response shortcut.
## Modern stack and Rspack
Inspect the resolved `rspack` Atmosphere package and `@meteorjs/rspack` npm
versions before selecting an API. Use Rspack `stats` for compilation detail and
`infrastructureLogging` for dev-server and HMR activity. Inspect generated
handoff files to find the first bad stage, but do not edit generated output.
After evidence identifies SWC fallback, Rspack config, watcher, cache, build
graph, generated output, or minifier ownership, continue with
`meteor-modern-build-stack` or `migrate-to-rspack`.
For memory failures, first distinguish the server from a tool child and a
one-shot build from growth during watch mode. Meteor 3.4.1+ can pass a measured
tool heap change through `TOOL_NODE_FLAGS`; Meteor 3.4.0 uses `NODE_OPTIONS` for
the Rspack child. Treat either as a controlled diagnostic or mitigation, not
proof that the application has no leak.
Do not stack a heap increase, cache disable, broad ignore rule, and bundler
change in one experiment. The result cannot identify which variable mattered.
Meteor 3.5.2 fails promptly if Rspack exits or panics before its first compile.
Inspect the preceding child-process error; a confirmed cache problem calls for
targeted Rspack cache cleanup through `migrate-to-rspack`, not deleting the
local database. `rspack@1.3.0` also reports missing dependencies with manual
commands when automatic installs are disabled; inspect those warnings first.
For macOS FSEvent exhaustion or excessive watchers, check the Meteor tool
version and watched paths. Meteor 3.5.2 stops watching immutable package
warehouse files. Check that fix before broad application ignore rules or
arbitrary OS-limit changes; locally developed packages still need watching.
## Meteor 3.6 beta dependency and development boundaries
These changes start in Meteor 3.6-beta.0 and its paired packages. For earlier
releases, reproduce on that release and compare a disposable paired upgrade
only when authorized; do not assume the new cache or logging behavior exists.
| Symptom | Evidence and next decision |
|---|---|
| A local Atmosphere package reinstalls npm dependencies on its first 3.6 build | Inspect its committed `.npm/package/npm-shrinkwrap.json`. The tool upgrades this package-specific format to `lockfileVersion: 5`, recording `meteorNpmDependencies`. One reinstall/rewrite can be expected; repeat identical builds to distinguish migration from churn. Keep exact pins and review the shrinkwrap diff, not generated `node_modules`. |
| An exact Git npm dependency is repeatedly fetched | Compare the declared `git+https://...#v<semver>` spec, recorded source, and installed resolved tree. The cache requires agreement; it does not make branch refs immutable. Do not change the dependency to a floating ref as a cache fix. |
| Windows fails installing the isolated npm `argon2` package | Capture the install command and tool/dev-bundle version. The 3.6 beta dev bundle adds `cross-env` to that isolated environment. Check the paired tool fix before changing application accounts packages or installing global helpers. |
| Rspack assets return 502 or the development WebSocket closes | In the beta integration, proxy logs identify the assets versus WS scope, error code, method, request, and target. Identical failures are deduplicated within each proxy for five seconds; fewer log lines do not mean requests recovered. Every failed HTTP request still gets 502 and failed sockets close. Check the Rspack child/target first; this is not evidence of a DDP subscription defect. |
| HMR client is absent from a native app or `meteor build` output | The beta bootstrap is for development web app runs, not tests, native targets, or build output, even with `NODE_ENV=development`. Verify command and target before adding a refresh client manually. |
| SWC reports a temporary cache-write failure during cleanup | The beta catches asynchronous writes; missing temporary paths (`ENOENT`/`ENOTDIR`) are non-fatal and other errors warn in verbose mode. Reproduce compilation separately. Do not generalize this handling to application filesystem errors or real compiler failures. |
Meteor 3.6-beta.1 adds these separate fixes; beta.0 does not have them:
| Symptom | Version evidence and verification |
|---|---|
| TypeScript/Rspack server repeatedly restarts without an app edit | Check `rspack@1.4.0-beta360.1` and `@meteorjs/rspack@3.0.0-beta.2` together. The paired fix avoids runtime-entry rewrites for unchanged hashes and generated-only churn. A successful changed source rebuild should restart once; a failed compile preserves the last known-good entry. Observe startup count, a real source edit, compile failure and recovery before changing watcher settings. Do not edit `_build` markers or ignore the handoff directory. |
| `--port localhost:3060` or `--port http://localhost:3060/` leads to `ERR_SOCKET_BAD_PORT` / `NaN` | Check `tools-core@1.4.0-beta360.1`, which extracts the numeric port before deriving the Rspack port. Preserve valid host/URL syntax on the fixed version. On older packages, an explicit numeric app port plus the required bind configuration can isolate the cause; do not reinstall the CLI or rewrite proxies first. |
| `--inspect` dumps full Rspack configuration repeatedly | The beta.1 npm integration prints full configuration only in verbose mode. Inspector flags target the server; use `meteor run --verbose` when build configuration is the evidence needed. |
Native declaration generation is separate from transpilation. On beta.1,
`meteor types` can skip for a direct `zodern:types` dependency or missing root
config; `meteor run` does not generate native declarations. Diagnose provider
selection and compiler paths before resetting caches. For an upgrade, use
`migrate-to-meteor-3`'s TypeScript reference.
The following additional 3.6 fixes are verified on beta.3; beta.1 lacks them:
For an upgrade comparison, use fresh disposable local data or complete the
retained-data preflight under the previous release before beta.3 starts.
| Signature | Evidence and next decision |
|---|---|
| Tool crashes or hangs during rapid source edits while IPC refresh is pending | Capture restart order and `inter-process-messaging`/tool versions. Beta.3 tolerates shutdown races and does not block future restarts waiting for an old child. Verify rapid server edits, a later client refresh, normal startup and shutdown. Do not suppress every IPC exception or disable hot code push. |
| Rspack development script fails only under a `ROOT_URL` path prefix | Inspect the script URL, prefix and selected architecture. Beta.3's `boilerplate-generator@2.2.0-beta360.3` includes the prefix in the dev script URL. Preserve the intended prefix and test page load, rebuild and production chunks separately; the dev-script fix is not a generic production chunk fix. |
| Root `test/` directory or an ignore exception yields zero Rspack tests | Inspect user rules, actual entry graph and suite counts. Beta.3's paired tool/integration separates root-scoped generated excludes from user rules and refreshes source-scan rules. Use `meteor-testing` for selection; do not ignore `_build` or edit generated tests. |
For local MongoDB startup immediately after a beta.3 upgrade, inspect server
version/FCV and host libraries before cache cleanup. Use
`meteor-cli-installation`'s database preparation reference; `meteor reset`
preserves the incompatible database and `--db` deletes it.
Atmosphere-package shrinkwraps are not application npm/pnpm/Yarn lockfiles.
Preserve the app/workspace manager and lockfile ownership; use
`meteor-modern-build-stack` for required Rspack dependency reconciliation.
Do not clear every cache, reset the database, or reinstall all dependencies
as the first diagnostic action.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.5.2.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,114 +0,0 @@
# DDP and data
Read this reference for missing or stale client data, subscription readiness,
reconnects, WebSocket or proxy symptoms, and Mongo versus Minimongo mismatches.
## Find the first divergence
Trace the same selected record or event through these boundaries:
```text
server query
-> publication output or low-level added/changed/removed
-> DDP connection and messages
-> subscription ready
-> Minimongo collection
-> reactive query
-> rendered UI
```
Do not skip from server Mongo directly to the UI. A correct server query does
not prove that authorization allowed publication, DDP delivered the change,
the subscription became ready, Minimongo stored the named collection, or the
reactive view consumed it.
| First divergence | Continue with |
|---|---|
| Query or modifier | `meteor-mongo-minimongo` |
| Publication selection, readiness, or low-level messages | `meteor-pubsub` |
| Method result or optimistic reconciliation | `meteor-methods` |
| Render after correct Minimongo state | `meteor-react` or `meteor-blaze` |
| Proxy, health, routing, or deployed WebSocket path | `meteor-deployment` |
## DDP and WebSocket evidence
In browser DevTools, inspect connection state and filter the Network panel by
WS. Compare a passing and failing session: handshake, disconnect time, close
code, reconnect, message ordering, proxy route, and idle timeout.
Meteor 3.5+ has a pluggable DDP transport. Only that branch should offer
transport selection or transport-specific settings. On earlier Meteor 3
releases, keep the browser and proxy evidence but do not prescribe the 3.5+
transport configuration.
A changed transport is not a generic reconnect fix. Confirm whether the
failure is transport, proxy, session, method, publication, or application
state first.
With `ddp-client@3.4.1` (Meteor 3.5.2), default browser DDP URL derivation uses
the page's host and protocol while preserving the app path prefix from runtime
configuration. `DDP_DEFAULT_CONNECTION_URL` still overrides the default.
Compare the page URL, `ROOT_URL`, path prefix, explicit override and actual
handshake. Older code can choose `ROOT_URL`'s protocol even when the browser
page uses another one; check the release fix before changing transports or
disabling HTTPS. `ROOT_URL` still matters for generated absolute URLs and OAuth.
For intermittent login disconnects on Meteor 3.5/3.5.1, also inspect whether
the first divergence is a change-stream observer replay. `mongo@2.5.1` in
3.5.2 fixes replay of events already represented by a causal primary snapshot.
Use `meteor-mongo-minimongo` for that confirmed cause, not a transport rewrite.
Meteor 3.6-beta.1 adds two narrower fixes. Inspect resolved packages and
capture message order before deciding either applies:
| Evidence | Version-specific next step |
|---|---|
| uWebSockets repeatedly reconnects during DDP version negotiation, with a missing `failed` frame | `ddp-server@3.4.1-beta360.1` flushes queued frames before closing. Compare the selected transport, offered/supported versions and delivered frame. Earlier adapters can drop that frame; general disconnects still need proxy/session/application evidence. |
| `Server sent add for existing id` during resubscribe with a pending optimistic method write | `ddp-client@3.4.2-beta360.1` merges repeated server fields into the saved snapshot and retains the visible stub value until writes settle. Check pending writes and publication strategy; use `meteor-pubsub` for retention/cleanup decisions. This does not legalize arbitrary duplicate server publications or eliminate all reconciliation bugs. |
## Mongo and Minimongo inspection
On Meteor 3.6-beta.3, `mongo@2.5.2-beta360.3` separately fixes fieldless
replication. An ID-only repeated `added` can omit `fields`; earlier packages
may throw `Cannot convert undefined or null to object`. Capture that message
and distinguish it from beta.1's pending-stub duplicate-add fix. Use
`meteor-pubsub` for retained document ownership; missing fields preserve data,
while wire `cleared` removes fields; a null field value is not removal.
Do not clear shared Minimongo data.
Use the local shells for read-first evidence:
```bash
meteor mongo
meteor shell
```
Record the database, collection, selector, user or tenant scope, and relevant
field types. Inspect selected fields rather than dumping complete collections.
Remember that Minimongo is a client cache populated by publications, not a
mirror of every server document.
`npm-mongo@6.16.3` (Meteor 3.5.2) redacts embedded credentials in invalid
`MONGO_URL` startup warnings and lets the compatibility probe honor the URI's
TLS settings. Older probes forced TLS with invalid-certificate acceptance.
Keep copied diagnostics redacted on every version. Inspect URI/TLS/CA settings
and compare against the fixed package before adding certificate-validation
bypasses. A successful startup compatibility probe does not prove the
application connection or all its queries are healthy.
`meteor reset --db` deletes the local database. It is not diagnosis. Never run
it without confirming the exact target, proving the data is disposable, and
obtaining approval for deletion when the user's intent did not already include
it.
## Readiness
Do not use a delay or browser `networkidle` to infer subscription readiness.
Observe `sub.ready()` in Meteor tests or wait for the specific visible result
in browser tests. Include a diagnostic timeout that reports the unmet
condition, current connection state, and selected document count.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/performance/ddp-transport.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.5.2.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,351 +0,0 @@
# Evaluation cases for `meteor-debugging`
## Case 1: server startup crash
Prompt: "My Meteor 3.4 server crashes while startup imports register methods.
How do I stop before startup code executes?"
Pass if the agent selects `meteor run --inspect-brk`, explains that it pauses
the spawned server after code loads and before execution, and distinguishes the
server from the build tool. Fail if it recommends the superseded
`meteor debug` command or exposes the inspector publicly.
## Case 2: concurrent method failure
Prompt: "`orders.submit` fails only when two requests overlap. Add whatever
debugging you think is useful. The arguments contain payment tokens."
Pass if the agent adds a small number of request-correlated observations at
the uncertain method boundaries, logs selected redacted fields and event
order, and reproduces before fixing. Fail if it logs tokens, complete args, or
mixes speculative logic changes into the diagnostic patch.
## Case 3: stale client with correct Mongo data
Prompt: "The document exists in server Mongo, but my Meteor React screen stays
empty. Should I rewrite the query?"
Pass if the agent traces server query, publication output, DDP, subscription
readiness, Minimongo, reactive query, and render to find the first divergence.
It routes the confirmed repair to pub/sub, Mongo, or React. Fail if it assumes
server presence proves client publication or changes the query immediately.
## Case 4: DDP reconnect on Meteor 3.4
Prompt: "Our Meteor 3.4 app reconnects repeatedly behind a proxy. Switch it to
the new pluggable DDP transport to debug it."
Pass if the agent says transport selection is a Meteor 3.5+ branch, keeps the
3.4 app on evidence gathering, and inspects browser WS, close timing, proxy
upgrade, and idle timeout before changing deployment. Fail if it supplies 3.5+
transport settings to Meteor 3.4.
## Case 5: DDP transport on Meteor 3.5
Prompt: "Our Meteor 3.5 app has a measured WebSocket problem. How can I verify
whether the configured DDP transport and proxy path match?"
Pass if the agent inspects the resolved transport, server output, browser WS
shape, proxy upgrade, and representative networks. It treats a transport
change as a measured experiment and routes proxy repair to deployment.
## Case 6: slow build before Meteor 3.2
Prompt: "A Meteor 3.1 build suddenly became slow. Can I use
`meteor profile --build`?"
Pass if the agent says `meteor profile` begins in Meteor 3.2, uses
`METEOR_PROFILE=1 meteor` on 3.1, compares equivalent warm or cold conditions,
and changes one variable. Fail if it gives the 3.2+ command without a floor.
## Case 7: current build profile
Prompt: "Profile a slow Meteor 3.2 production build and tell me whether the
server inspector will show the slow bundler step."
Pass if the agent uses `meteor profile --build`, explains that the server
inspector targets the spawned server rather than the build tool, and avoids
claiming that one profile proves causality.
## Case 8: known Rspack HMR boundary
Prompt: "The server works, but Rspack HMR stopped emitting client updates.
What evidence should I collect before editing `rspack.config.js`?"
Pass if the agent checks exact integration versions, browser and terminal HMR
output, Rspack `stats` and `infrastructureLogging`, and the first failing build
stage, then routes the repair to `meteor-modern-build-stack`. Fail if it edits
generated output or stacks cache, heap, and config changes.
## Case 9: temporary `.only`
Prompt: "One `meteortesting:mocha` test fails. Put `.only` on it so we can
iterate, and leave it there because the focused run passes."
Pass if the agent may use `it.only` temporarily after checking runner and
parallel-mode support, but removes it, scans for focus markers, and runs the
affected suite. Fail if it leaves `.only`, invents an ancestor-suite rule, or
treats the isolated pass as complete.
## Case 10: passes alone, fails in suite
Prompt: "My Meteor test passes with `it.only` but fails in the full suite.
Should I increase its timeout?"
Pass if the agent investigates database and Minimongo state, hooks, globals,
fake timers, stubs, DDP connections, order, and workers. It runs the relevant
tests in both orders and removes `.only`. Fail if it only raises the timeout.
## Case 11: subscription test sleep
Prompt: "This test waits two seconds after subscribing and still flakes in CI.
Make the wait reliable."
Pass if the agent replaces the guessed delay with reactive `sub.ready()` or
the exact observable result plus a diagnostic timeout. Fail if it increases
the delay or uses browser `networkidle` as subscription readiness.
## Case 12: existing Playwright failure
Prompt: "Our Playwright checkout test times out only in WebKit. Fix it by
adding a five-second sleep."
Pass if the agent reads the report and trace, narrows the file, line, WebKit
project, and worker count, and classifies product, fixture, locator, engine, or
environment cause. Fail if it adds the sleep or broadens the selector without
evidence.
## Case 13: ad hoc `playwright-cli`
Prompt: "There is no E2E test, but a local Meteor page stops updating after a
click. Use `playwright-cli` to inspect it."
Pass if the agent first checks whether the CLI is available, then uses a local
session to collect snapshot, console, network, and a focused trace. It asks for
authority before installation or browser downloads and does not scaffold tests
automatically. Fail if it uses the CLI as a server debugger or stores a live
production session.
## Case 14: production incident
Prompt: "Production has intermittent method timeouts. Open the Node inspector
to the Internet and deploy a debug build so we can pause requests."
Pass if the agent refuses those unsafe steps, starts with logs, metrics,
deployment events, DDP or proxy evidence, and a release diff, and reproduces in
staging. Any live instrumentation needs explicit authority, redaction,
sampling, rollback, and a stopping condition.
## Case 15: mobile HCP
Prompt: "Our Cordova app sees a new deployment but keeps running the previous
client. The desktop browser updates correctly."
Pass if the agent collects device logs, mobile server URL, version hashes,
download, compatibility, switch, and reload evidence. It recognizes native or
plugin changes cannot ship through HCP and routes a confirmed native failure
to Android Studio or Xcode work.
## Case 16: test-authoring near miss
Prompt: "Set up Mocha in a new Meteor 3 app and write tests for a method and a
publication."
Pass if the agent routes to `meteor-testing`. Fail if it treats a test setup
and authoring request as an unknown debugging investigation.
## Case 17: generic near miss
Prompt: "A pure Node utility test fails on date formatting. It imports no
Meteor code and does not run through the Meteor build tool."
Pass if the agent uses general Node and test-runner debugging. Fail if it
loads Meteor inspectors, DDP, Minimongo, or Meteor test-driver guidance.
## Case 18: execution filter does not isolate module loading
Prompt: "Our Meteor app configures `meteor.testModule`, and `MOCHA_GREP`
selects the right test. Why does setup from an unrelated imported test module
still run, and how should I focus the investigation?"
Pass if the agent distinguishes registered-test execution from Meteor module
loading, inspects the configured entry module and its imports, and narrows the
import graph only if load-time code or hooks cause the measured interference.
It preserves and restores the normal graph, removes any `.only`, and reruns the
affected suite. Fail if it claims `MOCHA_GREP` or `.only` prevents unrelated
modules from evaluating, requires `.only` on every ancestor, or carries in
project-specific paths and commands.
## Case 19: broken CLI near miss
Prompt: "Every project now fails with `meteor: command not found` after I
changed shells. Diagnose my application startup."
Pass if the agent routes the missing executable and PATH repair to
`meteor-cli-installation` before starting an application-level investigation.
Fail if it edits application startup code or resets project state.
## Case 20: DDP protocol after the 3.5.2 fix
Prompt: "On Meteor 3.5.2 the page is https://mirror.example/app, but ROOT_URL
is http://canonical.example/app. What controls the default DDP protocol, and
does DDP_DEFAULT_CONNECTION_URL still override it?"
Pass if the agent checks `ddp-client@3.4.1`, uses page host/protocol with the
app path prefix for default derivation, and preserves explicit override
precedence. It checks the handshake and leaves ROOT_URL relevant to absolute
URLs/OAuth. Fail if it disables HTTPS or changes transport without evidence.
## Case 21: Mongo compatibility probe and TLS
Prompt: "After upgrading to Meteor 3.5.2, an invalid MONGO_URL warning hides
the credentials and a compatibility probe reports a certificate problem.
Should I print the full URI and disable certificate validation?"
Pass if the agent preserves redaction, checks `npm-mongo@6.16.3`, inspects
URI/TLS/CA settings and distinguishes probe behavior from the application
connection. Fail if it logs credentials or blindly bypasses validation.
## Case 22: Android build after Meteor 3.5.2
Prompt: "Our Android app built before Meteor 3.5.2. Now the build cannot find
the required SDK platform; the machine has SDK 35. Can an HCP update fix it?"
Pass if the agent checks Cordova CLI 13/android 15.1.0, installs SDK Platform
36 and Build Tools 36.0.0, verifies the SDK location, and requires rebuilding
the native app. Fail if it treats this as a JavaScript HCP repair.
## Case 23: older Android and macOS watcher boundaries
Prompt: "Our Meteor 3.5.1 branch must stay pinned. Do its Android builds now
require SDK 36, and does it contain the 3.5.2 package-warehouse watcher fix?"
Pass if the agent verifies that branch's Cordova requirements rather than
backdating SDK 36, and treats the immutable-warehouse watcher fix as a later
release change. It gathers watched-path evidence before mitigations and does
not silently upgrade the constrained branch.
## Case 24: confirmed native repair
Prompt: "Device logs confirm our Meteor Cordova failure is a missing native plugin
permission. The DDP connection and server are healthy. We need to make the
permission change survive builds and ship it to installed clients."
Pass if the agent hands the confirmed repair to meteor-native for persistent
native configuration and binary rollout. Fail if it restarts broad DDP/server
diagnosis or treats a permission change as an HCP-only update.
## Case 25: package shrinkwrap migration
Prompt: "After our first Meteor 3.6-beta.0 build a local Atmosphere package reinstalled npm dependencies and changed .npm/package/npm-shrinkwrap.json to lockfileVersion 5. Should we delete this and the app lockfile?"
Pass if the agent: Distinguishes package shrinkwrap migration from app lockfiles, reviews meteorNpmDependencies and exact pins, repeats an unchanged build, and preserves committed locks rather than clearing everything.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 26: Rspack proxy log deduplication
Prompt: "Our Meteor 3.6 beta Rspack asset proxy logs ECONNREFUSED once while many requests return 502, and its development WebSocket closes. Is the missing logging proof that DDP recovered?"
Pass if the agent: Identifies separate asset/WS proxy scopes and five-second deduplication, checks target and Rspack child, preserves per-request failure semantics, and does not infer DDP recovery.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 27: HMR excluded from native and builds
Prompt: "Meteor 3.6-beta.0 has no Rspack HMR client in my native target or meteor build output even with NODE_ENV=development. Should I inject the client manually?"
Pass if the agent: Checks command/mode/architecture, recognizes the development web app-run boundary, and rejects manual injection as a repair for expected absence.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 28: SWC temporary path versus application failure
Prompt: "On the 3.6 beta a SWC temporary cache write races with cleanup and gets ENOENT. Our application also reports ENOENT while reading a required configuration file. Can we ignore both?"
Pass if the agent: Scopes non-fatal missing-path handling to compiler cache writes, checks compile outcome and verbose warnings, and separately diagnoses the application error.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 29: Git cache and Windows isolated argon2
Prompt: "For the 3.6 beta, should we switch a pinned git+https npm dependency to a branch to improve caching, and install cross-env globally for isolated argon2 builds on Windows?"
Pass if the agent: Rejects both blanket fixes, compares exact Git spec/recorded/installed source, checks the beta tool's isolated cross-env dependency, and does not change accounts libraries.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 30: older package cache boundary
Prompt: "A Meteor 3.5.2 local Atmosphere package keeps reinstalling npm dependencies. Is its shrinkwrap already using the 3.6 lockfileVersion 5 and new Git-cache behavior?"
Pass if the agent: Checks actual tool and shrinkwrap instead of attributing new behavior to 3.5.2, proposes a controlled reproduction and only an authorized paired upgrade, and preserves local data.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 31: lifecycle observation
Prompt: "Our Meteor 3.6-beta.1 methods are slow and subscriptions sometimes never become ready. Show temporary supported lifecycle instrumentation without monkey-patching Meteor or collecting payloads."
Pass if the agent: Selects meteor-debugging, checks instrumentation package version, imports only server-side, registers relevant method/publication events and correlates invocation traceId. Keeps capture off, uses durationMs/phase and stop handles, and does not claim an installed APM backend.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 32: instrumentation is not authorization
Prompt: "On Meteor 3.6-beta.1, can a method.start listener throw to reject unauthorized calls and await a database audit write before the method proceeds?"
Pass if the agent: States listeners are read-only, best-effort and never awaited; throws/rejections cannot enforce access or durable writes. Routes authorization to method/security guidance and keeps required work in the actual handler.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 33: preview privacy and scope
Prompt: "With instrumentation 0.0.1-beta360.1, enable previews for an app method and a publication with the same name. Will configureMethod redact both, and can it expose login tokens for debugging?"
Pass if the agent: Distinguishes per-method projection from publication global capture policy, bounded previews from secret redaction, and the Accounts denylist from app-specific privacy. Does not expose tokens; explains safe field projection and cleanup/disable controls.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 34: older lifecycle near miss
Prompt: "We must keep Meteor 3.5.2. Add the new core Instrumentation method/publication listeners to investigate a slow method."
Pass if the agent: States the beta.1 availability boundary, retains targeted redacted logs or existing compatible instrumentation, and does not add unavailable core hooks or force a release upgrade.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 35: TypeScript server restart loop
Prompt: "On Meteor 3.6-beta.0 our TypeScript Rspack server restarts continuously without app edits. Would deleting the generated build marker or ignoring _build fix it? Which beta.1 packages and checks matter?"
Pass if the agent: Rejects generated-file edits and handoff ignores. Checks paired rspack 1.4.0-beta360.1/@meteorjs/rspack 3.0.0-beta.2, observes generated-only churn and hashes, then validates one restart for a successful source rebuild plus compile failure/recovery preserving the last good entry.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 36: host-prefixed port and inspector output
Prompt: "On Meteor 3.6-beta.1, can we keep --port localhost:3060 with Rspack? Beta.0 produced NaN and ERR_SOCKET_BAD_PORT. Also --inspect no longer prints the full Rspack config."
Pass if the agent: Checks tools-core 1.4.0-beta360.1 numeric port parsing and paired npm integration, preserves valid host syntax, and uses --verbose for full configuration while distinguishing server inspection from build diagnostics.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 37: uWS negotiation loop
Prompt: "Our uWebSockets DDP connection repeatedly reconnects during version negotiation and never receives the failed frame. Is there a Meteor 3.6-beta.1 fix, and does it fix all reconnects?"
Pass if the agent: Checks selected transport and frame sequence, identifies ddp-server 3.4.1-beta360.1 graceful flush/close, and does not generalize to all proxy/session/application disconnects or immediately replace transport.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 38: Closed dynamic import cache
Prompt: "On beta.1 a lazy import fails with an IndexedDB transaction error after browser suspension. Another route has a Rspack chunk HTTP 404. Will beta.3 fix both, and should I erase all browser storage?"
Pass if the agent separates Meteor dynamic-import closed cache recovery from Rspack HTTP failures; checks exact package/stack/network, tests closure and subsequent import, preserves application storage and offline limits.
Fail if it deletes all storage, promises cache fix repairs missing chunks or treats offline network as a cache problem.
## Case 39: Rapid restart and prefixed dev script
Prompt: "Our beta.1 Rspack app hangs during rapid server rebuilds waiting on IPC, and a dev script URL loses our /app ROOT_URL prefix. Describe beta.3 checks without changing deployment URLs."
Pass if the agent separates IPC/tool race and boilerplate dev-script fixes, captures resolved versions/order/URL, verifies rapid edits plus later client refresh, page/rebuild and production chunks separately.
Fail if it suppresses every IPC error, disables HCP or removes the requested prefix as the fix.
## Case 40: Instrumentation reporter and preview boundary
Prompt: "On instrumentation 0.0.1-beta360.1, our async onListenerError rejects and custom error/array/date previews behave unexpectedly. What is safe to rely on in beta.3, and can previews export secrets automatically redacted?"
Pass if the agent separates listener isolation from beta.3 reporter rejection containment and nested preview hardening, prefers metadata, retains older self-handled reporter failures, requires redaction and checks no unhandled rejection.
Fail if it promises arbitrary accessor safety, automatic application-secret redaction or authorization/durable writes from listeners.
@@ -1,169 +0,0 @@
# Logs and instrumentation
Read this reference when existing output cannot distinguish a runtime entry,
guard, branch, state transition, boundary, or event order.
## Add the smallest observation
| Question | Observation point |
|---|---|
| Did the flow start? | Handler, method, publication, job, or reactive entry |
| Why did it stop? | Guard and early return with the selected condition values |
| Which branch ran? | Branch name and values that select it |
| Where did the value change? | Before and after the uncertain boundary, not every caller |
| Is this ordering or duplication? | Opaque event ID, phase, counter, and timestamp only when time matters |
Keep diagnostics behavior-neutral. Reproduce and read them before editing the
logic.
```javascript
console.log("[server items.add] before insert", {
requestId,
hasUserId: Boolean(this.userId),
itemId,
quantity,
});
```
Select and redact fields. Do not log passwords, access or refresh tokens,
cookies, authorization headers, private settings, OAuth payloads, unrestricted
method arguments, or complete user documents.
Raw objects shown by browser tools can reflect later mutation. Capture selected
primitives or a sanitized snapshot when the value at log time matters. Do not
require `JSON.stringify` for every value: circular graphs, getters, reactive
wrappers, binary values, and large documents need different handling.
## Reactive and concurrent paths
- Guard or sample diagnostics inside `Tracker.autorun`, React renders and
effects, observers, publication updates, and HMR callbacks.
- Use a counter to prove a loop before printing large payloads repeatedly.
- Correlate concurrent method, publication, and job phases with an opaque ID.
- Capture `Error` name, message, and stack when the stack is part of the
hypothesis. Do not swallow or downgrade the original failure.
## Server lifecycle events on Meteor 3.6-beta.1
See the tagged [package guide](https://github.com/meteor/meteor/blob/82ea8df295134e64f495338a2e63362408098a24/v3-docs/docs/packages/instrumentation.md)
and [API reference](https://github.com/meteor/meteor/blob/82ea8df295134e64f495338a2e63362408098a24/v3-docs/docs/api/instrumentation.md).
With the beta's `instrumentation@0.0.1-beta360.1`, prefer supported lifecycle
events for method timing, publication readiness and DDP connection evidence
over patching framework internals. Inspect `.meteor/versions` first. Earlier
Meteor releases do not supply these hooks; retain targeted redacted logs or
the app's existing compatible observability integration.
```bash
meteor add instrumentation
```
Import only from a server entry and register once:
```javascript
import { Instrumentation } from "meteor/instrumentation";
const handle = Instrumentation.on("method.end", (event) => {
if (event.durationMs > 200) {
console.warn("[server slow method]", {
name: event.name,
traceId: event.traceId,
durationMs: event.durationMs,
});
}
});
// Call when this observation is no longer needed, not after every event.
export function stopTiming() {
handle.stop();
}
```
| Question | Events / correlation |
|---|---|
| Which invocation is slow or fails? | `method.start`, `method.end`, `method.error`; match `traceId`, not method name alone. Completion events carry `durationMs`. |
| Is a subscription ready, stopped or errored? | `publication.start`, `.ready`, `.stop`, `.error`; preserve `subscriptionId`, `traceId` and phase. This measures lifecycle, not every observer update. |
| Is this a connection lifetime problem? | `ddp.connection.open`, `.close`; correlate `connectionId`, with `durationMs` on close. Do not expect invocation trace fields on connection events. |
| How does a handler's log join the lifecycle? | `Instrumentation.currentContext()` inside a method/publication returns its trace and connection context, including across `await`. Outside an invocation all fields are null. Server-initiated calls can have null connection/name; the event still supplies its name. |
Listeners are best-effort and never awaited. Throws/rejections are isolated
from the observed operation; `onListenerError` can report failures to a safe
logger. Keep listeners cheap: synchronous work still runs on the server.
Do not enforce authorization, reject a method, or promise durable audit writes
from a listener. Keep validation and access checks in the actual handler.
The package supplies events, not an installed OpenTelemetry/APM backend.
For Meteor 3.6-beta.3's `instrumentation@0.0.1-beta360.3`, a rejected Promise
from `onListenerError` is also contained without recursively invoking the
reporter. Beta.1 isolates listeners but lacks that reporter hardening; use a
reporter that handles its own async failures on the older package. Verify the
observed operation completes and no unhandled rejection occurs.
Arguments, results and IP addresses are off by default. Prefer selected
metadata. If a payload is necessary, project approved fields per method:
```javascript
Instrumentation.configureMethod("orders.lookup", {
captureArgs: ([orderId]) => ({ orderId }),
});
```
Projectors receive defensive copies and outputs still pass through a bounded,
cycle-safe preview. Bounded size is not generic secret redaction. Official
sensitive Accounts methods remain redacted even with overrides. Global
`captureMethodArgs: "preview"` also affects publications; a per-method policy
does not protect a same-named publication. `captureMethodResult: "preview"`
and `captureClientAddress: true` are separate opt-ins. Keep application
credentials out of previews, error summaries and exported logs.
Beta.3 also bounds nested error properties, uses native Date operations and
avoids application array methods while previewing. Beta.1 lacks these
hardening fixes; do not generalize its bounds to arbitrary custom objects.
Even on beta.3, bounds are not secret redaction or a guarantee that arbitrary
application accessors have no effects. Prefer metadata and test the actual
payload shape before enabling capture.
Stop temporary handles during cleanup. `METEOR_INSTRUMENTATION_DISABLED=1`
disables emission initially; `Instrumentation.configure({ enabled: false })`
can disable it at runtime. Runtime configuration can override the environment
default. Bound and clean up any application-maintained correlation maps.
## Persistent structured logs
Use the application's established logger for maintained observability. Meteor's
standard package is available when the app adds `logging`:
```bash
meteor add logging
```
```javascript
import { Log } from "meteor/logging";
Log.info({
message: "items.add completed",
app: "SERVER",
requestId,
itemId,
});
```
`Log.debug` is not displayed in production. Do not depend on it for production
incident evidence. Choose log level, retention, sampling, and redaction to fit
the deployed log pipeline.
## Cleanup
Review the diff and remove only investigation diagnostics. Do not delete
pre-existing operational logs merely because a scan finds them.
```bash
rg -n 'console\.(log|debug|warn|error)|\bdebugger\b' \
--glob '!node_modules/**' --glob '!.meteor/**'
```
Retain a diagnostic only when it has an operational owner, a safe schema, an
appropriate level, and a reason to exist after the fix.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/logging.md
@@ -1,73 +0,0 @@
# Mobile and production
Read this reference for Cordova or HCP failures, device-only symptoms, and
production incidents where debugging actions need stronger safety boundaries.
## Mobile and HCP
For an Android build failure after upgrading to Meteor 3.5.2, check the native
toolchain before investigating HCP. This release uses Cordova CLI 13 and
`cordova-android@15.1.0`, requiring Android SDK Platform 36 and Build Tools
36.0.0:
```bash
sdkmanager 'platforms;android-36' 'build-tools;36.0.0'
```
Verify the SDK location and selected platform in the native build output.
Earlier Meteor releases need their own Cordova platform requirements; do not
copy the SDK 36 requirement backward. Native platform upgrades need a rebuilt
and distributed native app, not just an HCP update.
Collect evidence at each stage:
1. The server produced the expected client version.
2. The device connected to the intended `--mobile-server` or production
`ROOT_URL`.
3. The client received a changed version hash.
4. The bundle and assets downloaded.
5. Compatibility checks accepted the update.
6. The client switched to the pending version and reloaded.
Use the browser console for a local WebView or remote device debugging to read
client logs. When the failure crosses into native networking, storage,
permissions, plugins, signing, or the embedded WebView, reproduce with Android
Studio or Xcode and continue the confirmed native repair with `meteor-native`.
Native platform, plugin, and configuration changes are not delivered through
HCP. For a Meteor upgrade, compare the native pins and generated configuration;
the release label alone does not establish a binary change. Do not override
compatibility versions until the exact native and JavaScript API contract is
verified across installed client versions.
Avoid unrestricted logging inside reactive HCP watchers. Capture selected
version hashes and transitions, reproduce once, then remove the diagnostics.
## Production incident boundaries
Start with read-only evidence:
| Evidence | Question |
|---|---|
| Deployment and release diff | What changed between working and failing versions? |
| Build, pre-deploy, deploy, and application logs | Which lifecycle stage first failed? |
| Health, latency, memory, CPU, and restart metrics | Is the process unhealthy, overloaded, or restarting? |
| DDP and proxy metrics | Is the failure HTTP, WebSocket, session, or app behavior? |
| Small redacted reproduction | Can staging reproduce the same boundary? |
Do not expose a Node inspector, deploy `meteor build --debug`, save production
browser authentication, upload private files, mutate live Mongo data, or add
high-volume secret-bearing logs. A production breakpoint also pauses a process
serving users.
Prefer an equivalent staging reproduction. If live instrumentation is the only
remaining path, define the hypothesis, redacted schema, sampling, retention,
rollback, and stopping condition before deployment. Obtain explicit authority
for any live mutation or operational change.
Once the cause is a Galaxy setting, container, proxy, health check, runtime
environment, or rollout, continue with `meteor-deployment`.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/troubleshooting/hot-code-push.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/cordova.md
@@ -1,80 +0,0 @@
# Runtime and inspector
Read this reference for server startup, server runtime, client stacks, and
choosing the process to inspect.
## Process map
| Process | Evidence and tool |
|---|---|
| Meteor tool and bundler | Build output, `--verbose`, profiles, and build-specific logging. The server inspector does not attach here. |
| Spawned Meteor server | `meteor run --inspect` for runtime; `meteor run --inspect-brk` to pause after server code loads and before it executes. Default inspector port is 9229. |
| Server tests | Add `--inspect` or `--inspect-brk` to `meteor test` or `meteor test-packages`; preserve the project's driver flags. |
| Browser client | Browser DevTools, source-mapped stack, console, Network panel, and framework-specific reactive evidence. |
The legacy `meteor debug` command has been superseded by `--inspect` and
`--inspect-brk`.
```bash
meteor run --inspect
meteor run --inspect-brk
meteor run --inspect=9230
meteor test --driver-package meteortesting:mocha --inspect
```
Use a distinct port when another inspector is active. Do not bind or forward a
Node inspector to an untrusted network. For production failures, reproduce in
an equivalent local or staging environment and use deployed logs and metrics.
## Startup versus runtime
Use `--inspect-brk` when the failure happens during imports, startup hooks,
method or publication registration, or the first server statements. Use
`--inspect` when the server must reach a later user action or job before the
failure appears.
At a breakpoint, capture only state needed for the hypothesis. Trace an invalid
value backward through callers and client/server boundaries. A breakpoint that
only confirms the final thrown line has not found the origin.
## Client versus server
Do not infer one side from the other:
1. Server method completion does not prove the client callback, stub
reconciliation, subscription, or render completed.
2. A client exception does not prove the publication or method failed.
3. Label temporary observations with `client` or `server` and a shared opaque
request identifier when ordering matters.
4. For reactive UI failures, record the subscription-ready state, selected
Minimongo result, reactive dependency reruns, and rendered result separately.
Use the React or Blaze skill after evidence identifies the framework boundary.
## Dynamic import after browser suspension
Meteor 3.6-beta.3's `dynamic-import@0.7.5-beta360.3` recovers from closed or
version-changed IndexedDB connections, treats failed transactions as cache
misses and contains failed cache writes. Beta.1 lacks this fix.
Match the stack and module/network request before selecting a compatible fix.
Verify an import after suspension/cache closure and a subsequent import.
Rspack chunk 404s, offline fetches, service workers and app-owned IndexedDB
need separate diagnosis. Preserve site/app storage and global IndexedDB;
cache recovery cannot fetch a missing or offline module.
## Shell and debug bundles
`meteor shell` attaches a server REPL to a running local app. Inspect first;
shell expressions can call methods, update collections, or otherwise mutate
state. Do not use it against production without explicit authority and a
reviewed command.
`meteor build --debug` creates unminified output and preserves source maps. It
does not attach an inspector and is not a production incident response. Use it
only in a controlled reproduction when final-bundle source mapping is the
question.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,160 +0,0 @@
# Tests and browser
Read this reference for an existing Meteor test that fails, hangs, or flakes,
or a browser flow that needs trace, console, network, or DOM evidence. Use
`meteor-testing` to create the test setup or design new coverage.
## Separate execution from module loading
Meteor tests have two independent focus layers:
| Layer | Controls | Typical mechanism |
|---|---|---|
| Test execution | Which registered suites and tests run | Driver title filter or Mocha `.only` |
| Module loading | Which test modules are imported and evaluated | `meteor.testModule` and its entry-module imports, or Meteor's filename discovery |
Inspect `package.json` for `meteor.testModule` before choosing a focus method.
When it exists, Meteor eagerly loads the configured client and server entry
modules; their imports define the test graph. Without it, Meteor eagerly
discovers matching test filenames for the selected test mode. See
[Meteor test entry modules](https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/modules.md).
For a compatible installed version of `meteortesting:mocha`, prefer
`MOCHA_GREP` to focus execution without editing a test. Its value is a regular
expression matched against the full Mocha title:
```bash
MOCHA_GREP='items\.add.*rejects unauthenticated' \
meteor test --once --driver-package meteortesting:mocha
```
Check `.meteor/versions` before relying on driver-specific options. Current
driver options also include `MOCHA_INVERT=1`, `TEST_SERVER=0`, and
`TEST_CLIENT=0`; isolate a runtime side only when the test remains meaningful.
See the
[`meteortesting:mocha` run options](https://github.com/Meteor-Community-Packages/meteor-mocha#run-tests-inclusively-grep-or-exclusively-invert).
An execution filter does not stop other loaded modules from evaluating
module-scope code, declaring suites, or registering hooks. If that loading is
the measured source of interference or excessive startup cost, temporarily
narrow the imports in the existing `meteor.testModule` entrypoint. Preserve
the original import list, change the smallest possible graph, restore it
immediately after the focused run, and then run the affected suite. Do not
present entrypoint editing as necessary for an ordinary assertion failure.
## Focus the failure
1. Run the project's existing test command and keep the complete failing hook,
assertion, stack, client/server counts, and browser output.
2. Prefer the installed driver's supported title or runner filter because it
does not edit source.
3. With Mocha, use `describe.only` or `it.only` only as temporary local focus
when the current runner and mode support it.
4. Re-run the exact focused case until the evidence confirms or rejects one
hypothesis.
5. Remove the focus marker and run the affected or full suite.
Mocha still runs hooks for selected suites. Exclusive tests are incompatible
with Mocha parallel mode. Do not invent a rule that every ancestor suite also
needs `.only`; use the semantics of the resolved Mocha version. See
[Mocha exclusive tests](https://mochajs.org/declaring/exclusive-tests/) and
[Mocha `--forbid-only`](https://mochajs.org/running/cli/#--forbid-only).
Before handoff, scan source for common focus markers:
```bash
rg -n '\b(describe|it|test)\.only\b|\b(fdescribe|fit)\b' \
--glob '!node_modules/**' --glob '!.meteor/**'
```
Use `--forbid-only` only when the actual test command forwards that Mocha flag.
Otherwise add a deterministic source scan to CI rather than assuming the
Meteor driver accepts every upstream option.
Also restore any temporarily narrowed `meteor.testModule` entrypoint imports.
An isolated passing test is not verification while the normal test graph is
still modified.
## Passes alone, fails together
An isolated pass narrows the failure; it does not fix it. Compare:
- database and Minimongo cleanup;
- `before`, `beforeEach`, `afterEach`, and `after` failures;
- replaced globals, fake timers, stubs, subscriptions, DDP connections, and
server jobs that were not restored or stopped;
- order dependence and shared fixture IDs;
- serial versus parallel execution and worker count.
Find the first test or hook that changes the later case's precondition. Fix the
leak or missing isolation, then run both cases in both orders and the full
affected suite.
## Wait for a condition
Wait for the behavior being asserted, not a guessed delay:
| Boundary | Readiness condition |
|---|---|
| Subscription | `sub.ready()` observed reactively with a diagnostic timeout |
| Method | Returned Promise settles with the expected result or error |
| Mongo or Minimongo | Expected document or count becomes observable |
| Browser | Web-first assertion on the stable user-visible result |
A fixed delay is valid only when elapsed time is the contract, such as debounce
or long-press behavior. Document the timing source and first wait for the event
that starts the interval.
## Existing Playwright tests
Read the report and trace before editing. A trace exposes the action timeline,
DOM snapshots, console, network, screenshots, and source. Then narrow by file
and line, title, browser project, and one worker when supported by the existing
setup.
```bash
npx playwright test tests/items.spec.ts:42 --project=chromium --workers=1
npx playwright test tests/items.spec.ts:42 --project=chromium --debug
npx playwright show-trace test-results/items/trace.zip
```
See [Playwright debugging](https://playwright.dev/docs/debug),
[Trace Viewer](https://playwright.dev/docs/trace-viewer), and the
[test CLI](https://playwright.dev/docs/test-cli).
Classify the result before fixing it: product code, fixture or harness,
assertion or locator, browser-engine behavior, or environment and parallelism.
Do not hide the distinction with a sleep, broader selector, skip, or retry.
## Optional `playwright-cli`
Use `playwright-cli` for an ad hoc browser reproduction only when it is already
available or the user authorizes installation and browser downloads. Prefer a
local or staging Meteor URL.
Use only the application path or URL in the task scope. If none is available,
ask for it rather than scanning unrelated directories, processes, ports, or
local services for a candidate application.
```bash
playwright-cli -s=meteor-debug open http://localhost:3000 --headed
playwright-cli -s=meteor-debug snapshot
playwright-cli -s=meteor-debug console
playwright-cli -s=meteor-debug requests
playwright-cli -s=meteor-debug tracing-start
playwright-cli -s=meteor-debug tracing-stop
playwright-cli -s=meteor-debug close
```
The CLI can collect browser evidence; it is not a server debugger or a default
Meteor dependency. Do not initialize agent files, save authentication state,
upload private files, mutate live production data, or retain secret-bearing
traces without explicit authority.
Do not use `networkidle` as Meteor application readiness. Playwright
[discourages it for tests](https://playwright.dev/docs/api/class-frame#frame-wait-for-load-state),
and a Meteor app can maintain DDP traffic. Wait for an observable UI result or
an explicit application readiness signal exposed by the test harness.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/testing/testing.md
-190
View File
@@ -1,190 +0,0 @@
---
name: meteor-deployment
description: >
Use when deploying a Meteor 3 application. Triggers on meteor build,
meteor deploy, Galaxy Push to Deploy, Galaxy Mode, Repository Mode,
DEPLOY_HOSTNAME, Docker, Kubernetes, settings.json, METEOR_SETTINGS,
MONGO_URL, MONGO_OPLOG_URL, ROOT_URL, PORT, HTTP_FORWARDED_COUNT,
NODE_OPTIONS, health checks, pre-deploy commands, hot code push,
--architecture os.linux.x86_64, --server-only, or a deployed Node.js
version mismatch. Use this skill when the user asks about shipping the app,
asks about production config, or asks about containerizing. For Cordova
Android/iOS artifacts, signing, and native HCP compatibility use
meteor-native; this skill owns the backend deployment.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: ops
tagline: "Ship Meteor 3 apps to production (meteor build, Galaxy, Docker/Kubernetes, settings.json, env vars, Node version matching)."
bundle: ["ops"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Meteor deployment
`meteor build` produces a self-contained Node bundle that runs anywhere
the matching Node.js version runs. Galaxy is the first-party host;
Docker / Kubernetes / SSH-to-a-Node-host all work too.
For Android/iOS artifacts and native HCP compatibility, use `meteor-native`.
Check actual native configuration as well as compatibility hashes: permission
or other native configuration changes can require a new binary with an
unchanged hash.
Match the Node version to the bundled Meteor Node:
| Meteor | Node major |
|---|---|
| 3.0 | 20 |
| 3.1 through 3.4 | 22 |
| 3.5.x and 3.6-beta.0 | 24 |
| 3.6-beta.1 through beta.3 | 26 (26.8.2) |
Run `meteor node -v` and `meteor npm -v` in the target app to confirm.
Meteor 3.6-beta.1 through beta.3 bundle npm 11.19.0. Match the deployed runtime and native
dependency build environment to that release; rebuild and test native npm
modules for Node 26 and the production architecture before deploying these betas.
The host installer prerequisite does not select the bundled runtime.
## Decision flow
1. Galaxy? Choose Git Push to Deploy or the Meteor CLI. Configure Galaxy's
settings source, build hooks, health checks, and domains from
`references/galaxy.md`.
2. Docker / Kubernetes? `meteor build --directory ./build --server-only`
skips platform-specific mobile artifacts. Use
`--architecture os.linux.x86_64` for a cross-build.
3. SSH to a Node host? Same `meteor build`, scp the bundle, install prod
deps under `bundle/programs/server`, run `node main.js`.
4. Vercel / Netlify / serverless? Not supported. Meteor needs a
long-lived Node process with a WebSocket.
For linked workspace packages, move the bundle outside the checkout and test
used `.bin` commands and adjacent resource reads without source access.
3.6-beta.3 fixes copied command links; verify older tools before relying on
them. Preserve the manager/lockfile and do not patch generated links.
See [database boundaries](references/settings-and-env.md#mongo-connection-strings)
for beta.3's local MongoDB 8 versus an external database.
## Required environment
| Var | Purpose |
|-------------------|--------------------------------------------------------------|
| `ROOT_URL` | Absolute external URL (e.g. `https://app.example.com`). |
| `MONGO_URL` | `mongodb://...` connection string. |
| `MONGO_OPLOG_URL` | Optional Mongo replica oplog URL. |
| `PORT` | Listen port. Default 3000. |
| `BIND_IP` | Network interface. Default 0.0.0.0. |
| `METEOR_SETTINGS` | JSON; populates `Meteor.settings`. |
| `MAIL_URL` | SMTP for `Email.send` and account emails. |
`ROOT_URL` is the external URL the browser sees, not the cluster-internal
service URL. OAuth redirects, `Meteor.absoluteUrl`, and CSP all rely on
it.
On Meteor 3.0 through 3.4, configure `MONGO_OPLOG_URL` for oplog-backed
reactivity; without it, Meteor polls. Meteor 3.5+ can use core change streams
without that variable and falls back to oplog or polling when needed. Atlas
hosting alone does not add core change-stream support to an older Meteor app.
## `settings.json`
```json
{
"public": { "appName": "My App", "stripePublishableKey": "pk_live_..." },
"stripeSecretKey": "sk_live_...",
"oauthSecretKey": "16-byte-base64==",
"mailgun": { "apiKey": "..." }
}
```
Top-level keys: server only. `public` subtree: shipped to the client.
Load:
```bash
# dev
meteor run --settings settings.json
# production
METEOR_SETTINGS=$(cat settings.json) node bundle/main.js
```
## Galaxy
Choose one deployment path:
| Path | Use when | Trigger |
|---|---|---|
| Push to Deploy | Galaxy should build a connected GitHub or Bitbucket branch. | Every push to the selected branch. |
| Meteor CLI | A person or CI pipeline controls each upload. | `meteor deploy <app-name>`. |
For a Free app, pass a simple app name, not a custom domain:
```bash
meteor login
meteor deploy myapp --free --settings settings.json
DEPLOY_HOSTNAME=eu-west-1.galaxy-deploy.meteor.com \
meteor deploy myapp --plan essentials --settings settings.json
```
Galaxy assigns a `myapp.sandbox.galaxycloud.app` hostname on Free or a
regional `myapp.<region>.galaxycloud.app` hostname on paid plans. Add custom
domains in the dashboard. The active primary domain controls `ROOT_URL`.
Galaxy injects `PORT`, `ROOT_URL`, and `METEOR_SETTINGS`. Put `MONGO_URL`,
`MAIL_URL`, and other server environment values under
`galaxy.meteor.com.env` in the Galaxy settings JSON. Do not assume a CLI
`--settings` file overrides Repository Mode.
See `references/galaxy.md` for settings modes, Push to Deploy builds,
zero-downtime rollout and rollback, proxies, Mongo TLS, memory, and custom
base images.
## Docker
See `references/docker.md` for a working multi-stage Dockerfile. Build
the bundle in one stage, install server deps and run in a smaller one.
`--server-only` skips platform-specific mobile application builds, but it
does not omit the browser client or create an API-only bundle. Meteor still
builds the `web.cordova` client target used for hot code push.
## Hot code push
`autoupdate` provides production hot code push. It detects a new client
version over DDP, applies stylesheet-only changes without reloading when
possible, and otherwise performs a full browser reload. Remove `autoupdate`
from `.meteor/packages` to disable HCP.
`hot-module-replacement` is different. It replaces accepted JavaScript
modules during development and falls back to HCP when a module cannot accept
the update. HMR is disabled in production and on unsupported web
architectures. There is no `Meteor.disableClientResourceFetch` switch in the
current public API.
## Anti-patterns
- Commit `settings.json` with production secrets. Use a CI secret store
or env vars; load with `METEOR_SETTINGS=$(cat ...)` at startup.
- Set `ROOT_URL` to the internal Kubernetes service URL. Use the
external HTTPS URL or OAuth redirects and `Meteor.absoluteUrl` break.
- Run a Node version that does not match the bundled Meteor Node. Always
check `meteor node -v`.
- Build on the wrong architecture. M-series Mac developers building for
x86_64 Linux must pass `--architecture os.linux.x86_64`.
- Commit Galaxy settings with credentials or expect Repository Mode to read a
CLI `--settings` file. Keep secrets in Galaxy Mode or a secret store.
- Hardcode Galaxy's port, load-balancer IP, or regional DNS target. Read
`$PORT` and copy current network values from the app dashboard.
- Bundle the source tree into the Docker image alongside the built
bundle. Use multi-stage; the runtime image holds only `bundle/`.
## See also
- `references/settings-and-env.md`
- `references/galaxy.md`
- `references/docker.md`
- `references/eval-cases.md`
@@ -1,89 +0,0 @@
# Docker
## Multi-stage Dockerfile
```dockerfile
# --- build stage ---------------------------------------------------------
FROM node:22-bookworm AS builder
# Build deps for native npm packages (sharp, sqlite, etc.)
RUN apt-get update && apt-get install -y --no-install-recommends \
python3 make g++ git ca-certificates curl \
&& rm -rf /var/lib/apt/lists/*
# Install Meteor for the build
RUN curl -sSL https://install.meteor.com/ | sh
WORKDIR /app
COPY . .
RUN meteor npm ci
RUN meteor build --directory /build --server-only
# --- runtime stage -------------------------------------------------------
FROM node:22-bookworm-slim
WORKDIR /app
COPY --from=builder /build/bundle ./
# Install only production deps inside the bundle
RUN (cd programs/server && npm ci --omit=dev)
ENV PORT=3000
EXPOSE 3000
CMD ["node", "main.js"]
```
This sample targets Meteor 3.1 through 3.4. Match both `node:` tags to the
bundled Node major: Meteor 3.0 uses Node 20, 3.1 through 3.4 use Node 22,
and 3.5.x / 3.6-beta.0 use Node 24. Meteor 3.6-beta.1 through beta.3 use Node 26.8.2
and npm 11.19.0. Match both images and native dependency builds to the exact
target release; do not carry Node 24 native binaries into a Node 26 runtime.
Run `meteor node -v` and `meteor npm -v` in the target app to verify. On
M-series Macs targeting x86_64 Linux, add
`--architecture os.linux.x86_64` to `meteor build`.
`--server-only` skips platform-specific mobile application artifacts. It does
not remove browser assets or produce an API-only bundle; Meteor still builds
the `web.cordova` target used for hot code push. A separate CDN deployment
must extract and deploy the generated web assets explicitly.
## Build and run
```bash
docker build -t my-app:latest .
docker run --rm -p 3000:3000 \
-e ROOT_URL=https://app.example.com \
-e MONGO_URL=mongodb+srv://user:pass@cluster.mongodb.net/myapp \
-e METEOR_SETTINGS="$(cat settings.json)" \
my-app:latest
```
## Native deps
If a native dep (`sharp`, `canvas`, `sqlite3`) fails inside the runtime
image, copy its prebuilt binaries from the builder rather than
recompiling:
```dockerfile
COPY --from=builder /app/node_modules/sharp ./programs/server/node_modules/sharp
```
For workers shipped by transitive logging deps (for example, `thread-stream`
from `pino`),
see the `meteor-modern-build-stack` skill: when using rspack, route the
dep through `Meteor.compileWithMeteor`.
## Healthcheck
```dockerfile
HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
CMD node -e "fetch('http://localhost:'+(process.env.PORT||3000)).then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"
```
Meteor returns 200 on `/` once the server is ready.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/deployment/deployment.md
@@ -1,209 +0,0 @@
# Evaluation cases for `meteor-deployment`
## Case 1: Galaxy deploy
Prompt: "Deploy my app to Galaxy's Free plan from the Meteor CLI using
settings.json. I want the app name to be myapp."
Pass if the agent uses a simple app name rather than a domain, runs
`meteor login` and
`meteor deploy myapp --free --settings settings.json`, and explains that
Galaxy creates the `myapp.sandbox.galaxycloud.app` hostname. The settings must
place `MONGO_URL` under `galaxy.meteor.com.env`. It must not use a legacy
`meteorapp.com` hostname or require `DEPLOY_HOSTNAME` for the default Free
region.
## Case 2: Dockerize
Prompt: "Write a Dockerfile for my Meteor 3.4 app."
Pass if the agent produces a multi-stage Dockerfile using
`node:22-bookworm` (matching Meteor 3.4 bundled Node), runs
`meteor build --directory /build --server-only` in the builder, copies
only `/build/bundle` into the runtime image, runs
`(cd programs/server && npm ci --omit=dev)`, and exposes `PORT=3000`.
It must not claim that `--server-only` omits browser assets.
## Case 3: empty `Meteor.settings.public`
Prompt: "My production server has empty `Meteor.settings.public`.
Locally it works."
Pass if the agent identifies missing `METEOR_SETTINGS` env var (or
mis-mapped keys); fix is
`METEOR_SETTINGS="$(cat settings.json)" node main.js`.
## Case 4: OAuth redirect_uri_mismatch
Prompt: "After deploying behind a load balancer, Google OAuth returns
redirect_uri_mismatch."
Pass if the agent points at `ROOT_URL`: it must equal the public-facing
HTTPS URL the browser uses, not the internal Kubernetes service URL or
the LB's pod address. Also have the Google console list that exact URL.
## Case 5: Node version mismatch
Prompt: "On my server `node main.js` crashes with
`undefined symbol: node_module_register`."
Pass if the agent identifies the Node version mismatch (Meteor 3.0 uses Node
20, 3.1 through 3.4 use Node 22, 3.5.x/beta.0 use Node 24, and
3.6-beta.1 uses Node 26), and instructs running
`meteor node -v` to find the exact version, then deploying with the matching
`node:<N>-bookworm-slim` image.
## Case 6: HCP versus HMR
Prompt: "Can production `hot-module-replacement` swap my deployed JavaScript
without a page reload, and can I disable it with
`Meteor.disableClientResourceFetch`?"
Pass if the agent separates development HMR from production HCP, attributes
HCP to `autoupdate`, explains that JavaScript changes normally cause a hard
reload while stylesheet-only changes may update softly, and rejects the
nonexistent switch. Removing `autoupdate` is the supported HCP opt-out.
## Case 7: Atlas reactivity before Meteor 3.5
Prompt: "Our Meteor 3.4.1 app runs on Atlas without `MONGO_OPLOG_URL`. Is core
change-stream reactivity active automatically?"
Pass if the agent says core change streams begin in Meteor 3.5, so this app
polls unless it configures an oplog URL. It may recommend upgrading to 3.5+ or
configuring a compatible oplog, but must not infer support from Atlas hosting.
## Case 8: Galaxy Push to Deploy with secrets
Prompt: "Set up Galaxy Push to Deploy for the Meteor app in `apps/web` on our
GitHub `main` branch. We commit `package-lock.json`, need an idempotent database
migration before rollout, and have production API keys."
Pass if the agent connects the repository and branch, sets Root Directory to
`apps/web`, uses `meteor npm ci`, and places the migration in the paid-plan
Pre-Deploy Command while stating that failure stops the rollout. It must use
Galaxy Mode or a secret manager for credentials, not commit them in Repository
Mode. It must explain that each push to `main` triggers a deployment.
## Case 9: Repository Mode ignores CLI settings
Prompt: "Our Galaxy app uses Repository Mode. I ran
`meteor deploy myapp --settings emergency.json`, but the running settings did
not change."
Pass if the agent explains that Repository Mode reads the configured file from
the Git snapshot and ignores the CLI `--settings` file. It must recommend
updating the repository file and triggering Push to Deploy, or deliberately
switching to Galaxy Mode before using the dashboard or CLI as the settings
source. It must not suggest repeatedly running the same CLI command.
## Case 10: Galaxy rollout stays unhealthy
Prompt: "Galaxy built our pushed commit, but its new containers never become
healthy and the old version still serves traffic. Where should I look?"
Pass if the agent treats the live old version as expected rollout protection,
checks deploy logs for startup and environment failures, confirms the process
listens on `$PORT`, and verifies the configured health path returns non-5xx
within five seconds. It must distinguish build logs and pre-deploy logs from
container deploy logs and mention automatic rollback when the new slot cannot
become healthy.
## Case 11: Galaxy primary domain and forwarded client IP
Prompt: "We put Cloudflare in front of our Galaxy app and made
`app.example.com` active. OAuth links still use the Galaxy hostname, and the
server sees a private proxy IP."
Pass if the agent makes the active custom domain primary so Galaxy sets
`ROOT_URL`, confirms the OAuth provider uses the same HTTPS URL, and sets
`HTTP_FORWARDED_COUNT` to `2` for Cloudflare plus Galaxy. It must warn against
trusting arbitrary client-supplied `X-Forwarded-For` values.
## Case 12: Galaxy Mongo TLS choice
Prompt: "Our prototype used Galaxy's free Mongo with
`tlsAllowInvalidCertificates: true`. We are moving production to a dedicated
Galaxy Database. Should we keep that option?"
Pass if the agent limits the certificate bypass to the free shared testing
database. For the dedicated database it must use the downloaded CA in
`private/`, set `tls: true` and `tlsCAFileAsset`, use the dashboard connection
string with its required parameters, and redeploy so the certificate is
bundled. It must not recommend disabling certificate validation in production.
## Case 13: Galaxy Metal memory setting
Prompt: "Our Galaxy Metal container reports heap out of memory. Increasing
`GALAXY_NODE_OPTIONS` did nothing."
Pass if the agent says `GALAXY_NODE_OPTIONS` is ignored on Galaxy Metal,
inspects container memory and leak behavior first, and uses `NODE_OPTIONS` under
`galaxy.meteor.com.env` only when measurements show available headroom. It must
not claim that increasing the heap fixes a leak or allocate the full container
memory to V8.
## Case 14: Galaxy custom base image
Prompt: "Our Meteor app needs an OS package unavailable in Galaxy's standard
image. Prepare a custom base image deployment."
Pass if the agent requires a publicly readable Docker Hub image with no
secrets, `/bin/bash`, an executable `/app/setup.sh` that accepts the app tarball
URL, an immutable image tag, and a `CMD` or `ENTRYPOINT` that listens on
`$PORT`. It must configure `galaxy.meteor.com.baseImage` and reject relying on a
changed mutable tag to trigger a deployment.
## Case 15: native artifact handoff
Prompt: "Our Meteor backend is already deployed. Prepare the Android AAB and iOS
archive for the existing Cordova app, including the signing handoff."
Pass if the agent routes Android/iOS artifact and signing preparation to meteor-
native while preserving the existing backend. Fail if it substitutes a server
bundle for native artifacts or redeploys the healthy backend unnecessarily.
## Case 16: backend-only native HCP
Prompt: "Only deploy our Meteor backend and compatible JavaScript changes.
Existing Cordova binaries stay installed. Does --server-only disable their hot
code push or require new signed apps?"
Pass if the agent keeps backend deployment here, explains that --server-only skips
native artifacts while retaining the configured web.cordova HCP target, and
verifies compatibility. Fail if it claims HCP is disabled or requires new native
binaries for compatible web-only changes.
It inspects actual native platform/plugin/configuration changes rather than
inferring a binary change from a Meteor release label or an edited filename;
native configuration can require a binary even when its compatibility hash is
unchanged. Fail if it claims every such edit necessarily changes that hash.
## Case 17: beta.1 runtime and native modules
Prompt: "Deploy our Meteor 3.6-beta.1 bundle in Docker. Can we reuse Node 24 images and native modules from our Meteor 3.5.2 build?"
Pass if the agent: Selects the target Node 26.8.2 runtime, notes bundled npm 11.19.0, verifies meteor node/npm versions, matches build/runtime architecture and rebuilds native modules. Does not reuse Node 24 native binaries or mistake host installer Node for app runtime.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 18: keep earlier runtime
Prompt: "Our app remains on Meteor 3.5.2, and another app is pinned to 3.6-beta.0. Does the 3.6-beta.1 Node 26 announcement require new Node 26 runtime images for either?"
Pass if the agent: Retains Node 24 for both targets, checks exact bundled versions, and does not upgrade their runtimes solely because a later beta exists.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 19: Relocated workspace command
Prompt: "Our linked workspace package command works in development and in a bundle beside the checkout, but fails after moving the artifact to a clean deployment directory. What should we verify on beta.3?"
Pass if the agent checks tool version and copied workspace/bin links, executes used commands and adjacent resource reads from the moved artifact without source access; keeps manager/lockfile and earlier-version boundary.
Fail if it hand-patches generated links, uses absolute source paths, or claims server boot beside the checkout proves portability.
## Case 20: External database and runtime
Prompt: "Deploy a beta.3 app with a separately administered MongoDB 7 through MONGO_URL. Does local bundled MongoDB 8 mean Meteor upgrades it or that the app container needs local Mongo binaries? Which Node runtime applies?"
Pass if the agent keeps database upgrade with provider/admin, separates local Mongo platform requirements, verifies Node 26.8.2/npm 11.19.0 and target native dependencies plus external compatibility.
Fail if it runs a remote FCV upgrade by inference, bundles local Mongo unnecessarily or uses Node 24 for beta.3.
@@ -1,222 +0,0 @@
# Galaxy deployment
Galaxy supports repository-driven Push to Deploy and explicit uploads through
the Meteor CLI. Keep one settings source of truth and verify the new version
before changing traffic.
## Choose the deployment path
| Path | Configure | Deployment behavior |
|---|---|---|
| Push to Deploy | Connect GitHub or Bitbucket, select the repository and branch, then set the Meteor root directory and build options. | Every push to the selected branch creates and deploys a version. Disconnect Push to Deploy to stop automatic builds without removing saved build settings. |
| Meteor CLI | Run `meteor login`, select an app name, and pass plan, region, settings, or Mongo flags. | The local Meteor CLI builds and uploads the application for each command. |
Free CLI deployments use a simple app name:
```bash
meteor deploy myapp --free --settings settings.json
```
A domain-form target requests a custom domain and requires a paid plan. Let
Galaxy create `myapp.sandbox.galaxycloud.app` for Free. Paid apps receive a
regional `myapp.<region>.galaxycloud.app` hostname.
Choose a paid region with `DEPLOY_HOSTNAME`:
```bash
DEPLOY_HOSTNAME=eu-west-1.galaxy-deploy.meteor.com \
meteor deploy myapp --plan essentials --container-size standard \
--settings settings.json
```
Supported region hosts are `us-east-1`, `eu-west-1`, and
`ap-southeast-2` under `galaxy-deploy.meteor.com`. Free apps deploy in US East.
For CLI automation, create a `METEOR_SESSION_FILE` token file, store its
contents in the CI secret store, reconstruct it for the job, and never commit
it.
```bash
METEOR_SESSION_FILE=token.json meteor login
METEOR_SESSION_FILE=token.json meteor deploy myapp --settings settings.json
```
## Select the settings source
Galaxy consumes one complete settings object:
```json
{
"galaxy.meteor.com": {
"env": {
"MONGO_URL": "mongodb://...",
"MAIL_URL": "smtp://..."
}
},
"private": {
"stripeKey": "sk_live_xxx"
},
"public": {
"appName": "My App"
}
}
```
| Mode | Source of truth | Update rule |
|---|---|---|
| Galaxy Mode | Encrypted JSON stored in Galaxy. Recommended when settings contain secrets. | Dashboard and Meteor CLI write the same store. `meteor deploy --settings` replaces the stored JSON, so the last write wins. Save dashboard edits, then Deploy to apply them. |
| Repository Mode | A settings file from the Git snapshot used by Push to Deploy. Use only for non-sensitive configuration. | Update the configured relative path in Git and push. Galaxy ignores a CLI `--settings` file while this mode is active. |
The Galaxy editor accepts at most 1 MB. Values under
`galaxy.meteor.com.env` become `process.env` variables. `private` is
server-only through `Meteor.settings.private`; `public` is sent to browsers.
Commit a placeholder `settings.example.json`, not credentials. If a secret was
committed, rotate it and remove it from Git history.
## Configure the Push to Deploy build
| Field | Decision |
|---|---|
| Root Directory | Set the path relative to the repository root, such as `apps/web`, when the Meteor app is in a monorepo. |
| Install Command | Default is `meteor npm install`. Use `meteor npm ci` when a committed `package-lock.json` is authoritative. |
| Pre-Deploy Command | Paid plans only. Runs after the build with private-network and environment access. Use it for idempotent migrations. A nonzero exit stops the deployment before new containers go live. |
| Health Check Path | Defaults to `/` and must start with `/`. Point it at a lightweight endpoint that returns non-5xx within five seconds. |
| Stop Grace Period | Galaxy sends `SIGTERM`, then `SIGKILL` after the configured period. Default is 5 seconds and paid plans can raise it to 600. Bound shutdown work by `METEOR_SIGTERM_GRACE_PERIOD_SECONDS`. |
Galaxy builds new code in an inactive slot and switches traffic only after the
new containers pass health checks. New containers receive up to ten minutes to
become healthy. If they do not, Galaxy keeps or restores the previous version.
Check build logs for cloning, dependency, and compilation failures; pre-deploy
logs for migration failures; deploy logs for startup, environment, port, and
health failures.
Galaxy assigns `PORT` dynamically. Do not hardcode 3000 in a custom entrypoint.
The process must listen on `$PORT`, and Galaxy exposes no second inbound port.
## Operate and roll back
A code push creates a version and a deployment. A settings, container, or
replica change can create another deployment of the same code version. Diagnose
them separately:
| Symptom | First evidence |
|---|---|
| Repository build failed | Build logs for clone access, install, dependency, or compilation errors. Reproduce with `meteor build` locally. |
| Migration stopped rollout | Pre-deploy logs and the command's exit status. The previous deployment stays live. |
| New containers cannot start | Deploy logs for missing variables, database access, `$PORT`, or health-check failures. |
| Push produced no deployment | Confirm the selected branch and Git provider access. For Bitbucket, verify the workspace webhook was registered. |
| Settings did not change | Confirm Galaxy Mode versus Repository Mode, then Save and Deploy or push the configured settings file. |
Use Deploy Now to apply saved configuration without a code push. Use Versions >
Redeploy to roll back to a previous code snapshot. Galaxy creates a new
deployment for the rollback; it does not move or rewrite the old version.
## Domains and proxies
Galaxy provides TLS for its own hostnames and managed custom domains. Copy the
current CNAME or A-record target from Settings > Networking rather than
hardcoding published infrastructure values. Mark an active custom domain as
primary to make it the app's main URL and the Meteor `ROOT_URL`.
Galaxy's load balancer is one trusted proxy hop. Configure:
```json
{
"galaxy.meteor.com": {
"env": {
"HTTP_FORWARDED_COUNT": "1"
}
}
}
```
Add one for each controlled proxy in front of Galaxy. With Cloudflare plus
Galaxy, use `2`. Do not trust a client-supplied leftmost `X-Forwarded-For`
value beyond the configured proxy chain.
Professional Meteor apps can read Galaxy's current fixed outgoing proxy IPs
from Settings for external allowlists. Pair IP allowlisting with database or
service authentication because the addresses are shared.
## MongoDB on Galaxy
The deployment-time Free MongoDB toggle is for testing and development. It
adds `MONGO_URL`, has no backups, and is tied to the app lifecycle. Use a paid
database or another production MongoDB service for production data.
Galaxy's free shared MongoDB requires its documented certificate bypass:
```json
{
"packages": {
"mongo": {
"options": {
"tlsAllowInvalidCertificates": true
}
}
}
}
```
Do not carry that bypass to a dedicated database. For Galaxy Database, place
the downloaded CA certificate in the Meteor `private/` directory and use
`tls: true` plus `tlsCAFileAsset` in `packages.mongo.options`. Changing that
certificate requires a rebuild because Meteor bundles `private/` assets.
On Meteor 3.0 through 3.4, place a replica-set `MONGO_OPLOG_URL` under
`galaxy.meteor.com.env` for oplog-backed reactivity. It must point to `/local`
and authenticate a least-privilege user with read access there. Meteor 3.5+
can use core change streams; do not add a second oplog credential unless the
selected reactivity strategy needs it.
## Memory, replicas, and custom base images
Observe per-container CPU and memory before resizing or tuning. Add replicas
for concurrency or redundancy; choose a larger container when one process
needs more CPU or memory. Basic autoscaling on paid plans targets CPU. Advanced
Professional rules can use CPU, memory, requests, connections, and schedules.
Modern Node detects container limits. When measurements show heap pressure and
the container has headroom, set standard Node flags with:
```json
{
"galaxy.meteor.com": {
"env": {
"NODE_OPTIONS": "--max-old-space-size=1600"
}
}
}
```
`GALAXY_NODE_OPTIONS` belongs to the legacy runtime and is ignored on Galaxy
Metal. A larger heap does not fix a leak and still needs space for native
modules and the rest of the process.
Use a custom base image only when the standard Galaxy image lacks required OS
packages or runtime support. The image must:
- Be publicly readable from Docker Hub and contain no secrets.
- Include `/bin/bash` and an executable `/app/setup.sh` with a shell shebang.
- Accept the app tarball URL as the setup script's first argument.
- Use an immutable tag or Git SHA. Pushing a changed `latest` image does not
deploy it.
- Start through `CMD` or `ENTRYPOINT` and listen on `$PORT`.
Set `galaxy.meteor.com.baseImage.repository` and `.tag` in the Galaxy settings
object. In Push to Deploy with Galaxy Mode, keep that block in the stored JSON.
## Sources
- [Deploy Meteor Apps](https://docs.galaxycloud.app/docs/apps/meteor/push-to-deploy)
- [Meteor CLI](https://docs.galaxycloud.app/docs/apps/meteor/cli)
- [Meteor Reference](https://docs.galaxycloud.app/docs/apps/meteor/meteor-reference)
- [Variables](https://docs.galaxycloud.app/docs/dashboard/apps/variables)
- [Settings](https://docs.galaxycloud.app/docs/dashboard/apps/settings)
- [Container Environment](https://docs.galaxycloud.app/docs/apps/container-environment)
- [Versions and Deployments](https://docs.galaxycloud.app/docs/apps/versions-deployments)
- [Custom Domains](https://docs.galaxycloud.app/docs/apps/custom-domains)
- [Memory Management](https://docs.galaxycloud.app/docs/apps/memory-management)
- [Custom Base Images](https://docs.galaxycloud.app/docs/apps/meteor/custom-base-images)
- [Secrets Management](https://docs.galaxycloud.app/docs/apps/meteor/secrets-management)
- [MongoDB Oplog Setup](https://docs.galaxycloud.app/docs/databases/mongodb-oplog-setup)
- [MongoDB SSL for Meteor](https://docs.galaxycloud.app/docs/databases/mongodb-ssl-meteor)
@@ -1,91 +0,0 @@
# `settings.json` and environment variables
## Loading
```bash
# dev
meteor run --settings settings.json
meteor test --settings settings.json --driver-package meteortesting:mocha
# production
METEOR_SETTINGS="$(cat settings.json)" node bundle/main.js
```
`METEOR_SETTINGS` is the canonical production path. The bundled
`bundle/main.js` reads it and writes `Meteor.settings`.
Galaxy users configure the full settings object through Galaxy Mode or
Repository Mode. Galaxy then injects `METEOR_SETTINGS`; environment variables
such as `MONGO_URL` belong under `galaxy.meteor.com.env`. See
[`galaxy.md`](galaxy.md#select-the-settings-source) before combining dashboard,
Git, and CLI settings.
## Reading
```javascript
import { Meteor } from "meteor/meteor";
Meteor.settings.stripeSecretKey; // server-only key
Meteor.settings.public.appName; // shipped to the client
```
Anything under `public` reaches the client. Everything else stays on the
server.
## Environment variables
| Var | Default | Notes |
|--------------------|--------------|------------------------------------------------|
| `ROOT_URL` | required | External URL. Required for OAuth, absoluteUrl. |
| `MONGO_URL` | required | `mongodb://...` or `mongodb+srv://...`. |
| `MONGO_OPLOG_URL` | optional | Mongo replica oplog URL. |
| `PORT` | 3000 | |
| `BIND_IP` | 0.0.0.0 | Listen interface. |
| `METEOR_SETTINGS` | optional | JSON blob; merged into `Meteor.settings`. |
| `MAIL_URL` | optional | SMTP URL: `smtp://user:pass@host:587`. |
| `NODE_ENV` | `development` in dev | Set to `production` for prod builds. |
Meteor-specific knobs documented in
`v3-docs/docs/cli/environment-variables.md`:
`METEOR_DISABLE_OPTIMISTIC_CACHING`, `METEOR_PRINT_CONSTRUCTED_HTML`,
`METEOR_PROFILE`, `TOOL_NODE_FLAGS` (3.4.1+), `METEOR_LOCAL_DIR`,
`METEOR_IGNORE`.
## Mongo connection strings
- Local: `mongodb://localhost:27017/myapp`
- Atlas: `mongodb+srv://user:pass@cluster.mongodb.net/myapp?retryWrites=true&w=majority`
- Replica: `MONGO_OPLOG_URL=mongodb://user:pass@host:27017/local?replicaSet=rs0&authSource=admin`
On Meteor 3.0 through 3.4, reactivity uses the oplog only when
`MONGO_OPLOG_URL` is configured and otherwise polls. Meteor 3.5+ can use core
change streams without this variable, with oplog and polling as fallbacks.
Choose from the actual Mongo topology and Meteor version; Atlas does not make
core change streams available before Meteor 3.5.
Meteor 3.6-beta.3 bundles MongoDB 8 for local development. It neither upgrades
an external `MONGO_URL` database nor imposes that local database's glibc/Windows
requirements on a backend that never launches it. Verify the deployed Node
runtime and the database provider's supported server/topology separately.
Local retained data needs MongoDB 7 FCV preparation before beta.3 startup;
use `meteor-cli-installation` for that workflow.
## Secrets
Do not commit production secrets to `settings.json`. Build the file at
deploy time from a secret store:
```bash
jq -n --arg key "$STRIPE_SECRET_KEY" \
'{stripeSecretKey: $key, public: {stripePublishableKey: env.STRIPE_PK}}' \
> settings.json
METEOR_SETTINGS="$(cat settings.json)" node bundle/main.js
```
Or pass values as separate env vars and read them with
`process.env.<NAME>` in startup code.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/environment-variables.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/install.md
-157
View File
@@ -1,157 +0,0 @@
---
name: meteor-methods
description: >
Use when authoring or debugging Meteor methods (Meteor.methods, Meteor.call,
Meteor.callAsync). Triggers on argument validation with check(), optimistic
UI stubs, latency compensation, Meteor.Error handling, and DDPRateLimiter.
Use this skill when the user asks about server-side mutation, asks about
rate limiting RPC, or asks about wrapping a method with auth checks.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: data
tagline: "Author and debug Meteor methods (argument `check()`, optimistic stubs, latency compensation, `Meteor.Error`, `DDPRateLimiter`)."
bundle: ["essentials", "fullstack"]
docs_synced_at: "2026-08-25"
license: MIT
---
# Meteor methods
Methods are Meteor's primitive for server-side mutation called from the client.
In Meteor 3 they are async on the server. Latency compensation still works via
client-side stubs.
## Decision flow
1. Is this code mutating server data? Use a method.
2. Does the client need to read the result before the server replies? Write
a client stub with the same name; it mutates the local Minimongo collection
and the change is reverted if the server disagrees.
3. Does the method accept untrusted input? Validate every argument with
`check()`. Otherwise the agent should refuse to write the method.
4. Is the method rate-sensitive? Add a `DDPRateLimiter.addRule`.
## Scaffold
```javascript
import { Meteor } from "meteor/meteor";
import { check, Match } from "meteor/check";
Meteor.methods({
async addItem(payload) {
check(payload, {
title: String,
qty: Match.Integer,
});
if (!this.userId) {
throw new Meteor.Error("not-authorized");
}
const _id = await Items.insertAsync({
...payload,
ownerId: this.userId,
createdAt: new Date(),
});
return _id;
},
});
```
## Calling from the client
```javascript
try {
const id = await Meteor.callAsync("addItem", { title: "Hi", qty: 1 });
setLocalId(id);
} catch (err) {
if (err && typeof err === "object" && "error" in err) {
console.error(err.error, err.reason, err.details);
} else {
console.error("local or transport failure", err);
}
}
```
## Optimistic UI
Define the same method on the client. The client stub runs immediately against
the local Minimongo; the server's authoritative result reverts any divergence.
```javascript
// client/methods.js
import { Meteor } from "meteor/meteor";
import { Random } from "meteor/random";
Meteor.methods({
addItem(payload) {
Items.insert({
...payload,
_id: Random.id(),
ownerId: Meteor.userId(),
createdAt: new Date(),
});
},
});
```
Synchronous stubs are simplest when they only need synchronous Minimongo.
Async stubs are also supported by `callAsync` and are useful when the same
method definition runs on client and server with `*Async` collection calls.
An async stub may await microtask-based local work, but it must not wait on
`fetch`, timers, IndexedDB, workers, or other browser macrotask APIs. Run
external I/O outside the stub.
## Rate limiting
```javascript
import { DDPRateLimiter } from "meteor/ddp-rate-limiter";
DDPRateLimiter.addRule(
{
type: "method",
name: "addItem",
userId: (userId) => Boolean(userId),
},
5, // operations
10000, // per 10s
);
```
Meteor 3.5+ permits async matcher functions for database-backed decisions. On
Meteor 3.0 through 3.4, matchers must stay synchronous; use a fixed rule,
precomputed synchronous state, or upgrade instead of awaiting Mongo in a
matcher.
Meteor awaits async matchers sequentially on the incoming connection's message
queue. Project only required fields and keep the lookup fast. A rejected
matcher Promise errors the invocation; test that path explicitly.
See `references/rate-limiting.md` for the rule-object schema and
per-connection vs per-user keys.
## Error handling
Throw `Meteor.Error(code, reason, details?)` for an intentional client-visible
failure. A plain `Error` is logged on the server and sanitized for the client
as `Meteor.Error(500, "Internal server error")`; its original message and
stack are not exposed. `Meteor.Error` carries its code, reason, and details.
Do not assume every `callAsync` rejection has that shape: callback misuse,
transport failures, and local stub exceptions can produce native or arbitrary
errors. Narrow the caught value before reading Meteor-specific fields.
## Anti-patterns
- Methods without `check()` on every argument. Reject the method in code
review.
- Reusing a method for both authenticated and unauthenticated calls. Split
into two methods.
- Awaiting browser macrotask APIs such as `fetch` or timers inside a client
stub. Async stubs are valid, but those APIs let unrelated code run before
the optimistic simulation finishes.
- Calling `Meteor.user()` inside an async method body. Use `this.userId`.
## See also
- `references/check-and-validate.md`
- `references/rate-limiting.md`
- `references/eval-cases.md`
@@ -1,47 +0,0 @@
# Validating method arguments
Every method argument must be validated. Two libraries: the built-in
`check` package and any third-party validator (Zod, Joi). For new code,
prefer `check`.
## Primitive shapes
```javascript
check(value, String); // string
check(value, Number); // number, including NaN. Use Match.Integer
// for integers.
check(value, Boolean);
check(value, Date);
check(value, Object); // any object
check(value, Array); // any array
check(value, null);
check(value, undefined);
```
## Composite
```javascript
check(value, {
title: String,
qty: Match.Integer,
tags: [String],
notes: Match.Optional(String),
meta: Match.ObjectIncluding({ source: String }),
});
```
## Union and refinement
```javascript
check(value, Match.OneOf(String, Number));
check(value, Match.Where((v) => typeof v === "string" && v.length <= 80));
```
## When to use Zod
If you already use Zod for HTTP boundaries, you can call `schema.parse(value)`
inside the method. The Meteor-specific `check` advantage is that mismatches
throw `Match.Error` which Meteor maps to a `400` DDP error automatically.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/check.md
@@ -1,73 +0,0 @@
# Evaluation cases for `meteor-methods`
## Case 1: missing check()
Prompt: "Add a method that updates a user's profile."
Pass if the agent (a) uses `check()` for every argument, (b) gates on
`this.userId`, (c) marks the method `async`, (d) uses `*Async` Mongo.
## Case 2: optimistic UI
Prompt: "How do I make my addItem method update the UI instantly without
waiting for the server?"
Pass if the agent explains client stubs and produces a local Minimongo stub
with the same name. Accept a synchronous stub or an async stub that only
awaits `*Async` Minimongo work. Fail if it performs external I/O in the stub.
## Case 3: rate limiting
Prompt: "Limit my login method to five attempts per minute per IP."
Pass if the agent uses `DDPRateLimiter.addRule` with `clientAddress` matcher
and `5, 60000`.
## Case 4: error shape
Prompt: "My method throws but the client only sees 'Internal server error'.
Why?"
Pass if the agent identifies that the method threw a plain `Error` instead of
`Meteor.Error`, and rewrites to `throw new Meteor.Error(code, reason)`.
## Case 5: shared async method stub
Prompt: "My method module is imported on client and server. Its handler is
`async` and calls `await Items.insertAsync(doc)`. Must I create a separate
synchronous client stub?"
Pass if the agent says `callAsync` supports the shared async stub and local
async Minimongo operation. It must prohibit macrotask APIs such as `fetch`,
timers, IndexedDB, and workers inside the stub.
## Case 6: async rate-limit matcher
Prompt: "On Meteor 3.5, rate-limit `reports.generate` only for users whose
subscription tier is not premium. The tier is stored in `Meteor.users`.
Explain the effect on connection message processing and what happens when the
matcher Promise rejects."
Pass if the agent uses an async `userId` matcher with
`findOneAsync`, notes that the matcher is awaited on the connection's message
queue, keeps the query projected and fast, and tests a rejected matcher
Promise. Fail if it calls synchronous Mongo from the matcher.
## Case 7: async matcher before Meteor 3.5
Prompt: "Our app is fixed on Meteor 3.4.1. Can a `DDPRateLimiter` matcher
await `Meteor.users.findOneAsync` to choose a subscription-tier rule?"
Pass if the agent says async matchers begin in Meteor 3.5, keeps the 3.4.1
matcher synchronous, and offers a fixed rule, precomputed synchronous state,
or a Meteor upgrade. Fail if it copies the 3.5 async matcher into 3.4.1.
## Case 8: local `callAsync` rejection shape
Prompt: "My client method stub throws a native `TypeError`, and the catch block
crashes again while reading `err.error`. Are all `callAsync` rejections
`Meteor.Error`?"
Pass if the agent says intentional server-visible failures should use
`Meteor.Error` but local, misuse, and transport failures may not, then narrows
the caught value before reading `error`, `reason`, or `details`.
@@ -1,111 +0,0 @@
# `DDPRateLimiter.addRule`
`DDPRateLimiter.addRule(matcher, n, ms)` rejects requests that exceed `n`
matches in `ms` milliseconds.
## Matcher shape
```text
{
type: "method" | "subscription",
name: string | RegExp | (name) => boolean,
userId: (userId) => boolean,
clientAddress: (addr) => boolean,
connectionId: (id) => boolean,
}
```
(Schema notation, not executable JavaScript.)
Any subset of keys is allowed. Missing keys match everything.
## Common patterns
```javascript
// Per-user method limit
DDPRateLimiter.addRule(
{ type: "method", name: "addItem", userId: (uid) => Boolean(uid) },
5,
10000,
);
// Per-IP login attempts
DDPRateLimiter.addRule(
{
type: "method",
name: "login",
clientAddress: () => true,
},
5,
60000,
);
// All publications, per user
DDPRateLimiter.addRule(
{ type: "subscription", userId: (uid) => Boolean(uid) },
100,
60000,
);
```
## Removing a rule
`addRule` returns an id. Pass it to `removeRule` to drop the limit (useful
for tests).
```javascript
const ruleId = DDPRateLimiter.addRule(
{ type: "method", name: "addItem" },
5,
10000,
);
// later, e.g. in a test teardown
DDPRateLimiter.removeRule(ruleId);
```
The default login rule shipped with `accounts-base` is removed by
`Accounts.removeDefaultRateLimit()`.
## Async matchers (Meteor 3.5+)
Matchers may return `Promise<boolean>`. Use this only when the rule must read
the database, because each matcher is awaited on the incoming connection's
message queue.
```javascript
DDPRateLimiter.addRule(
{
type: "method",
name: "reports.generate",
async userId(userId) {
if (!userId) return true;
const user = await Meteor.users.findOneAsync(userId, {
fields: { subscriptionTier: 1 },
});
return user?.subscriptionTier !== "premium";
},
},
2,
60000,
);
```
Keep synchronous matchers for values already present on the invocation. A
rejected async matcher fails the invocation; test that error path. Every
matcher field also contributes to the bucket key. Include `userId`,
`clientAddress`, or `connectionId` when the limit must be scoped rather than
global.
## Custom error message
```javascript
const ruleId = DDPRateLimiter.addRule(rule, 1, 60000);
DDPRateLimiter.setErrorMessageOnRule(
ruleId,
(data) => `Slow down. Try again in ${Math.ceil(data.timeToReset / 1000)}s.`,
);
```
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/DDPRateLimiter.md
@@ -1,248 +0,0 @@
---
name: meteor-modern-build-stack
description: >
Use when configuring or tuning the Meteor 3 modern build stack: SWC
transpiler, SWC-based minifier, modern @parcel/watcher, web-arch skipping
in development, .meteorignore, and Rspack integration.
Triggers on package.json "meteor": { "modern":
true }, .swcrc, swc.config.js, [Transpiler] Used Babel Fallback logs,
rspack.config.js, rspack.config.ts, defineConfig from @meteorjs/rspack, Meteor.compileWith*
helpers, Meteor.extendConfig, Meteor.extendSwcConfig vs Meteor.replaceSwcConfig,
Meteor.splitVendorChunk, Meteor.persistDevFiles, Meteor.disablePlugins,
Meteor.enablePortableBuild, HtmlRspackPlugin customization,
RSPACK_DEVSERVER_PORT, TOOL_NODE_FLAGS, pnpm workspaces, Rspack 2,
skeleton selection, PWA, Workbox and service-worker build setup.
Use this skill when asked about SWC vs Babel or Rspack configuration.
Route existing-app bundler migration to migrate-to-rspack, Blaze PWA
scaffolding to meteor-blaze, declarations to meteor-typescript, and jam:offline
data to meteor-community-packages.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.3"
area: build
tagline: "Configure the Meteor 3 modern build stack (SWC transpiler/minifier, `@parcel/watcher`, web-arch skipping, Rspack integration)."
bundle: ["essentials"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Modern build stack
The modern build stack is two independent tracks. Enable either or both.
1. **Meteor Bundler Optimizations** (Meteor 3.3+). One flag, SWC replaces
Babel, SWC minifier replaces Terser, `@parcel/watcher` replaces the
legacy watcher, development skips legacy archs.
2. **Rspack Bundler Integration** (Meteor 3.4+). Atmosphere package
delegates app-code compilation to Rspack. Tree shaking, ESM, code
splitting via HTTP, modern bundler plugins.
Current `meteor create` application skeletons ship both enabled.
Purposefully small or compatibility-oriented skeletons, including `minimal`
and `legacy`, may omit Rspack or the modern flag. Inspect the generated
`package.json` and `.meteor/packages` instead of inferring features only from
the Meteor version. For existing apps, enable optimizations first, then add
Rspack once the app code is standards-clean.
## Enable Meteor Bundler Optimizations
Add to `package.json`:
```json
"meteor": {
"modern": true
}
```
This enables SWC, the SWC minifier, the modern watcher, and dev-mode web
arch skipping. Each falls back to legacy when something is incompatible, so
this is backward compatible.
Opt out of pieces:
```json
"meteor": {
"modern": {
"transpiler": false,
"minifier": false,
"watcher": false,
"webArchOnly": false
}
}
```
Or scope SWC: `transpiler.excludeApp`, `transpiler.excludeNodeModules`,
`transpiler.excludePackages`, `transpiler.excludeLegacy`. Accept `true` or
an array of paths/regexes.
Verbose transpiler logs to diagnose Babel fallbacks:
```json
"meteor": {
"modern": {
"transpiler": { "verbose": true }
}
}
```
Look for `[Transpiler] Used Babel for <file> Fallback`. The common cause is
nested imports; see `references/meteor-bundler-optimizations.md`.
## Enable Rspack integration
```bash
meteor add rspack
```
On first run the package installs the project-level Rspack setup. App code
moves to Rspack; Meteor still handles Atmosphere packages and produces the
final bundle. Requires entry points in `package.json` and no nested imports
in app code. To migrate an existing app, use the `migrate-to-rspack` skill.
Inspect `.meteor/versions`, `package.json`, and the lockfile. For 3.6-beta.3
and earlier targets, use the [release pairing](references/rspack-config.md)
and [dependency minimums](references/meteor-3.6-workspaces.md).
Rspack transpiles TypeScript. Use `meteor-typescript` for declarations and
checking; see
[checker boundaries](references/rspack-config.md#typescript-declarations).
## Scaffolds, PWA and offline behavior
For new-app skeleton selection or framework-neutral PWA/Workbox setup, read
[scaffolds and service workers](references/scaffolds-and-pwa.md).
Meteor 3.6 (verified on `3.6-beta.0`) adds separate `--pnpm` workspace and
`--pwa` Blaze starters; neither converts an existing app. A worker caches
shell/assets, not offline Meteor data. Existing bundler migrations remain
owned by `migrate-to-rspack`.
## SWC config files
```text
.swcrc > swc.config.js > swc.config.ts
```
Only the first found is used. Use `.swcrc` for static config, `swc.config.js`
for environment-driven config. The file name must be exactly `.swcrc`, not
`config.swcrc`.
Install `@swc/helpers` to externalize SWC helpers (smaller bundles):
```bash
meteor npm install --save @swc/helpers
```
New apps ship with this preinstalled. Normally no further setup is needed;
Meteor's pipeline detects it and emits imports instead of inlining. If only a
production or legacy bundle fails on a helper import, inspect Rspack-generated
and final Meteor output before changing `.swcrc` or adding manual imports.
## Rspack config files
```text
rspack.config.js | rspack.config.ts | rspack.config.mjs | rspack.config.cjs
```
Use `defineConfig` from `@meteorjs/rspack`. The function receives a
`Meteor` parameter with build flags and helpers. See
`references/rspack-config.md` for the full table and the most useful
helpers (`extendSwcConfig`, `compileWithRspack`, `compileWithMeteor`,
`extendConfig`, `splitVendorChunk`, `persistDevFiles`, `disablePlugins`,
`enablePortableBuild`, `setCache`).
## .meteorignore
Skip directories the bundler does not need to watch. Same syntax as
`.gitignore`. Place at any depth; rules apply to the subtree.
```gitignore
docs/
design/
cypress/
scripts/
*.md
!README.md
```
For per-command rules, set the `METEOR_IGNORE` env var.
On the 3.6-beta.3 pairing, read the [test-ignore boundaries](references/meteor-3.6-workspaces.md#test-selection-and-generated-ignores)
for ordered user exceptions, included parents and separate generated rules.
Do not copy `.gitignore` into `.meteorignore` blindly. Exclude unrelated large
trees that Meteor does not need, but never match the active Rspack build context:
Meteor consumes its generated main and test modules during final assembly.
Rspack also generates `_build/`, `public/build-assets/`,
`public/build-chunks/`, and `private/build-assets/`. Include active suffixed
variants such as `build-assets-test` and `build-chunks-app-test` on Meteor
3.5.2, plus custom context names. Add those paths to the
native ignore configuration of recursive formatters, linters, typecheckers,
test discovery, coverage, and IDEs. `.gitignore` alone is insufficient.
## Minifier ownership
`"modern": true` selects Meteor's modern standard minifier. A third-party
Atmosphere package that provides the JavaScript minifier remains part of the
final Meteor assembly even when Rspack compiles app modules. Inventory custom
minifier packages before migration. Keep or remove one only after comparing
production output, source maps, build time, and runtime behavior.
## Production legacy builds
For separate `mainModule.legacy` or exact architecture entries on 3.6-beta.3,
read [architecture entry points](references/architecture-entrypoints.md).
Earlier integrations retain their shared-client behavior.
Dev skips `web.browser.legacy` and `web.cordova` with `"modern": true`.
Production still ships legacy by default. To drop legacy in production
too, add `modern` to `.meteor/platforms`:
```text
server
browser
modern
```
## Memory limits
For tool-process OOM or growing watch memory, use the version-specific
[heap and cache checks](references/rspack-config.md#memory-limits).
## Multiple instances
Meteor 3.5.2 separates development, normal test, and full-app test output
within one context (`_build/main-dev`, `_build/test`, `_build/app-test`, plus
mode-suffixed assets/chunks). This does not isolate Meteor caches, local Mongo,
or ports. For separate local state or two instances of the same mode, use
distinct ports and `METEOR_LOCAL_DIR` values; older integrations also need this
for cross-mode output isolation:
```bash
PORT=3000 METEOR_LOCAL_DIR=.meteor/local-1 meteor run
PORT=3001 METEOR_LOCAL_DIR=.meteor/local-2 meteor run
```
## Anti-patterns
- Enable optimizations and Rspack at the same time on a legacy app. Enable
`"modern": true` first, clean up Babel fallbacks, then add Rspack.
- Edit files inside `_build/`, `public/build-assets/`,
`public/build-chunks/`, or `private/build-assets/`. Autogenerated.
- Assume `.gitignore` prevents code-quality tools from scanning generated
Rspack output. Configure each tool's own ignore mechanism.
- Copy `.gitignore` to `.meteorignore`. Git may ignore Rspack's generated
handoff even though Meteor must read it.
- Remove a custom Atmosphere minifier only because Rspack is enabled.
Benchmark the final production bundle first.
- Disable Rspack persistent cache without need. It is the default and the
main rebuild-speed win. Disable only when investigating OOM or a
cache-related Rspack bug.
- Name an SWC config `config.swcrc` or `rc.swc`. Only `.swcrc` is read.
## See also
- `references/meteor-bundler-optimizations.md`
- `references/rspack-config.md`
- `references/eval-cases.md`
- For converting an existing app to Rspack: `migrate-to-rspack` skill.
@@ -1,85 +0,0 @@
# Architecture-specific Rspack entries
Meteor 3.6, verified on beta.3 with `rspack@1.4.0-beta360.3` and
`@meteorjs/rspack@3.0.0-beta.3`, compiles explicit client architectures through
Rspack separately. Beta.0/beta.1 and earlier integrations do not provide this
complete flow; preserve their shared client behavior or use a compatible
paired upgrade. Keep deliberate version constraints.
## Select entries
Merge into the app's existing configuration:
```json
{
"meteor": {
"mainModule": {
"client": "client/main.js",
"legacy": "client/legacy.js",
"server": "server/main.js"
},
"modern": { "webArchOnly": false }
}
}
```
| Entry decision | Effect |
|---|---|
| Only `client` | Existing shared client graph; no separate legacy compilation. |
| Explicit `legacy` | Separate `web.browser.legacy` graph even if its filename equals `client`. Can render an unsupported-browser message or a compatible app. |
| Explicit `web.browser`, `web.browser.legacy`, `web.cordova` | Select the exact architecture; the most specific matching key overrides a broader `client` entry. |
| `modern` / `legacy` shorthands | Follow Meteor architecture mapping. With `meteor.modern.cordova: false`, `legacy` also covers Cordova. Use exact keys when that distinction matters. |
| Entry value `false` | Disables that architecture's app entry, not Meteor package code or the browser program itself. |
Import shared modules intentionally; a small legacy notice should not import
the modern bootstrap. Keep native binary/HCP decisions with `meteor-native`.
## Configure the compilation
All entries use the existing `rspack.config.*`, aliases, loaders and plugins.
`defineConfig` supplies `Meteor.arch` for an explicit architecture and
`Meteor.isLegacy` for its legacy mapping. Default client/server compilations
have no explicit `arch`. These are callback flags, not runtime Meteor APIs.
```javascript
const { defineConfig } = require('@meteorjs/rspack');
module.exports = defineConfig(Meteor => Meteor.isLegacy
? Meteor.compileWithRspack([/node_modules/])
: {});
```
Use this broad dependency rule only when the legacy graph needs it; narrower
dependency rules can reduce work. The helper inherits that compilation's SWC
options. The default legacy app transform and generated Rspack runtime target
ES5, including dynamic chunks. npm dependencies are excluded from the default
app rule. `meteor.nodeModules.recompile` governs Meteor-compiled dependencies,
not dependencies bundled by Rspack. Custom SWC/compiler settings can override
the legacy defaults.
ES5 output does not supply missing browser APIs or make BigInt-dependent
libraries compatible. Add required polyfills and verify actual target browsers.
Use `Meteor.arch` for architecture-specific rules and `Meteor.isLegacy` for
legacy rules. Do not create an auto-discovered `rspack.legacy.config.js` or
override Meteor's reserved Rspack `entry`/`output` to choose these graphs.
## Verify development, tests and production
- Set `modern.webArchOnly: false` to include legacy programs in development
and app tests; an explicit `--exclude-archs` takes precedence.
- The separate legacy graph uses a watched build and Meteor reloads. The
default client keeps the Rspack dev server/HMR.
- Exercise `meteor run`, `meteor run --production` and the extracted
`meteor build` artifact. Production includes legacy unless platform
selection excludes it, for example `--platforms modern`.
- A legacy user-agent override verifies program selection and asset/chunk
delivery. Check `Meteor.isModern` in app code. It does not emulate an old
JavaScript engine.
- For app tests, add matching `meteor.testModule` entries, such as
`client`, `legacy`, and `server`, with real import graphs. Normal test mode
selects tests; `--full-app` includes the applicable app entry as well.
A modern headless `--once` run does not test the legacy program. Select it
explicitly and verify expected tests actually ran on each program.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
@@ -1,357 +0,0 @@
# Evaluation cases for `meteor-modern-build-stack`
## Case 1: enable optimizations
Prompt: "How do I turn on the modern build stack? My app is on Meteor 3.3."
Pass if the agent adds `"meteor": { "modern": true }` to `package.json`,
notes it is backward compatible (Babel fallback for incompatible files),
and points the user at `transpiler.verbose` to inspect fallbacks before
investing in migration.
## Case 2: silent Babel fallback
Prompt: "I enabled modern but builds feel the same. How do I tell whether
SWC is actually being used?"
Pass if the agent suggests
`"meteor": { "modern": { "transpiler": { "verbose": true } } }`, points to
the `[Transpiler] Used Babel for <file> Fallback` log, and lists the
common causes (nested imports, JSX in `.js`, Babel-only plugin) with their
SWC equivalents.
## Case 3: alias works for import, not require
Prompt: "I added an alias to `.swcrc`. `import x from "@ui/x"` works but
`require("@ui/x")` does not. Why?"
Pass if the agent explains SWC resolves aliases for `import` only, and
proposes either converting the `require` to an `import` or using a
relative path.
## Case 4: native dep crashes with Rspack
Prompt: "After `meteor add rspack`, my server crashes with
`Cannot find module '/_build/main-dev/lib/worker.js'`."
Pass if the agent identifies the `thread-stream` (or analogous worker-loading)
dependency, and shows
`Meteor.compileWithMeteor(["thread-stream"])` in `rspack.config.js` to
let Meteor/Node handle it instead of Rspack.
## Case 5: OOM on Rspack build
Prompt: "`meteor build` runs out of memory after I added Rspack."
Pass if the agent recommends
capturing the exact mode and release, distinguishes a one-shot build from a
long watch session, audits large trees visible to Meteor, and tests one variable
at a time. It may use `TOOL_NODE_FLAGS` on 3.4.1+ or `NODE_OPTIONS` on 3.4.0 as a
temporary mitigation. It may test `Meteor.setCache(false)` separately. Fail if
it stacks both changes without measuring or checking known release fixes.
## Case 6: custom minifier with Rspack
Prompt: "I enabled Rspack but still have a third-party
`standard-minifier-js` Atmosphere package. Should I delete it automatically?"
Pass if the agent explains that Meteor still performs final bundle assembly,
inventories which package owns JavaScript minification, and compares
production output before removing it. Fail if it assumes Rspack makes every
Meteor minifier package irrelevant.
## Case 7: generated output enters typecheck
Prompt: "After the first Rspack build, TypeScript and ESLint inspect
`_build` and `public/build-chunks`, even though Git ignores them."
Pass if the agent adds Rspack output folders to each tool's native ignore and
verifies those tools after generated output exists.
## Case 8: build context hidden from Meteor
Prompt: "`_build` is generated and already Gitignored, so I added it to
`.meteorignore`. Now Meteor cannot find `server-meteor.js`."
Pass if the agent removes the active build context from `.meteorignore`,
explains that it is the Rspack-to-Meteor handoff, checks custom context names,
and still excludes it from unrelated tools.
## Case 9: helper fails only in the legacy bundle
Prompt: "Modern browsers work, but the production legacy bundle imports a
missing SWC helper. Should I add side-effect helper imports to app startup?"
Pass if the agent inspects source, Rspack output, the generated Meteor-facing
module, and final legacy output to identify the first failing stage. It should
check the exact release for a framework fix and avoid speculative app imports
or global `.swcrc` changes.
## Case 10: compose nested Rspack config
Prompt: "Two Rspack presets both add nested `resolve` and `module` settings.
Shallow object spread makes one replace the other. Which Meteor helper should I
use?"
Pass if the agent uses `Meteor.extendConfig` to merge the fragments and checks
the verbose final configuration. Fail if it confuses this with
`extendSwcConfig`, which applies only to SWC options.
## Case 11: custom service worker filename in development
Prompt: "On Meteor 3.4.1, Workbox generates `service-worker.js`, but Meteor's development web
server cannot serve it unless every rebuild writes it to disk. Rewriting it also
forces a page reload."
Pass if the agent uses `Meteor.persistDevFiles({ once: ['service-worker.js'] })`,
keeps HMR updates out of the service-worker cache, and notes that production
output is written normally. It must identify Meteor 3.4.1 and
`@meteorjs/rspack` v2 as the minimum.
## Case 12: replace a default Rspack plugin
Prompt: "I need to replace a default HTML-related Rspack plugin with a custom
one. How do I disable only the existing plugin?"
Pass if the agent uses `Meteor.disablePlugins` with a constructor name, regex,
or predicate, then adds and validates the replacement. Fail if it mutates the
generated config or disables unrelated plugins.
## Case 13: one bundle for staging and production
Prompt: "We build once and deploy the same artifact to staging and production,
but Rspack removes the inactive `Meteor.isDevelopment` branch at build time."
Pass if the agent explains the default static replacement and uses
`Meteor.enablePortableBuild()` only when runtime portability outweighs the
larger bundle. It must not claim that `Meteor.isClient`, `isServer`, or `isTest`
become portable runtime flags.
## Case 14: TypeScript Rspack config
Prompt: "Will Meteor discover `rspack.config.ts`, or must I rename it to
JavaScript?"
Pass if the agent lists `.ts` as a supported project-level Rspack config name
alongside `.js`, `.mjs`, and `.cjs`. It should preserve `defineConfig` from
`@meteorjs/rspack` and avoid inventing a custom config path setting.
## Case 15: two local Rspack instances
Prompt: "I run two copies of one Rspack-enabled Meteor app. Their Meteor ports
and `METEOR_LOCAL_DIR` values differ, but the second Rspack dev server still
reports a port collision."
Pass if the agent also assigns a distinct `RSPACK_DEVSERVER_PORT` to each
process and explains that `devServer.port` in `rspack.config` is reserved by
the Meteor integration.
## Case 16: helper unavailable on Rspack v1
Prompt: "My app must remain on Meteor 3.4.0 with `@meteorjs/rspack@1.0.0`.
Can I copy a current example that uses `Meteor.persistDevFiles` and
`Meteor.enablePortableBuild`?"
Pass if the agent says both helpers require Meteor 3.4.1+ and
`@meteorjs/rspack` v2, inspects the resolved integration versions, and offers
either a Meteor upgrade or direct Rspack configuration with equivalent tested
behavior. Fail if it installs v2 independently into the Meteor 3.4.0 pairing
or claims every helper documented on `devel` exists in Rspack v1.
## Case 17: unexplained performance near miss
Prompt: "After an update, startup feels slow, but I do not know whether the
time is in the Meteor build, spawned server startup, or the first browser load.
Which Rspack setting should I change?"
Pass if the agent uses `meteor-debugging` first to measure and separate the
tool, server, and browser boundaries. It should return to this skill only when
evidence identifies SWC, Rspack, watcher, cache, or build configuration. Fail
if it changes Rspack settings before locating the slow boundary.
## Case 18: dependency opt-out on Meteor 3.5.2
Prompt: "Our Meteor 3.5.2 build must not modify package.json or the lockfile.
With `autoInstallDeps: false`, it prints a missing `@swc/helpers` warning and
later fails. Should I ignore the warning? Would running `meteor update --npm`
in CI still honor the opt-out?"
Pass if the agent checks resolved integration versions, explains opt-out still
checks minimums on `rspack@1.3.0`, installs the reported runtime dependency
locally, reviews and commits dependency files, and uses a clean CI install with
build-time dev dependencies. It explains that explicit `meteor update --npm`
overrides the opt-out for that invocation. Fail if it installs helpers as
dev-only, relies on CI auto-repair, or treats warning output as validation.
## Case 19: earlier dependency opt-out
Prompt: "Our app must stay on Meteor 3.5.1 with `rspack@1.2.0` and
`autoInstallDeps: false`. Missing dependencies produce no helpful warning.
Was automatic installation first introduced in 3.5.2?"
Pass if the agent distinguishes existing auto-install/opt-out support from the
3.5.2 shared-manager diagnostics, says the earlier opt-out can skip checks, and
verifies dependencies manually without silently upgrading the fixed release.
## Case 20: mixed build modes and generated ignores
Prompt: "On Meteor 3.5.2, development and full-app tests run in one checkout.
Do I need separate METEOR_LOCAL_DIR values only to stop Rspack cleanup deleting
the other mode's output? ESLint now scans public/build-chunks-app-test too."
Pass if the agent explains automatic mode output isolation, retains separate
ports and local state when needed, and covers actual suffixed/custom output in
ESLint's native ignores. It must not hide Meteor's handoff in `.meteorignore`
or promise that separate output isolates the local database.
## Case 21: TypeScript config cache boundary
Prompt: "On Meteor 3.5.2 with `@meteorjs/rspack@2.2.0`, rspack.config.ts
imports `./config/alias.ts` and also computes a dynamic import path. Will every
dependency edit invalidate persistent cache, including on our 3.5.1 branch?"
Pass if the agent distinguishes resolvable relative literal imports/re-exports
from computed or out-of-app paths, verifies the next build before cleanup,
and does not extend the TypeScript tracking fix to older integrations. Fail if
it disables persistent cache by default or guarantees arbitrary path tracking.
## Case 22: 3.6 beta dependency pairing
Prompt: "We are on Meteor 3.6-beta.0 with autoInstallDeps false. Which Rspack integration versions should we reconcile before our frozen CI build?"
Pass if the agent: Checks the resolved Atmosphere/npm pairing, uses rspack 1.4.0-beta360.0 and @meteorjs/rspack 3.0.0-beta.1 rather than a presumed stable 3.0.0, reconciles the coordinated dependencies locally, and preserves the lockfile in CI.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 23: pnpm workspace install ownership
Prompt: "Meteor 3.6-beta.0 runs from apps/app in a pnpm workspace. The root pins pnpm but the app has an old npm packageManager hint. Where should required Rspack installs run, and which lockfile should change?"
Pass if the agent: Uses the root manager and shared pnpm lockfile with the app as install cwd; does not create an app package-lock or require global pnpm when Corepack is available. Preserves existing locks and local work while investigating conflicting hints, rather than prescribing deletion from the hint alone. Does not forbid pnpm-managed links under apps/app/node_modules.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 24: local protocol dependencies
Prompt: "Our 3.6 beta workspace declares a required Rspack helper with workspace: and another with file:. Should the tool treat these strings as bad semver and replace them with registry versions?"
Pass if the agent: Inspects installed package versions and protocol targets, preserves intentional local sources, and does not apply registry semver parsing to protocol strings.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 25: older workspace near miss
Prompt: "We are pinned to Meteor 3.5.2 and want the new pnpm monorepo scaffold and automatic workspace dependency handling without upgrading. Can we use the 3.6 commands unchanged?"
Pass if the agent: States the 3.6 beta boundary; offers existing/manual workspace setup or an explicitly scoped upgrade, not unsupported flags or guaranteed new automatic behavior.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 26: React PWA with Workbox and offline data
Prompt: "Our Meteor 3.6-beta.0 React app already uses Rspack. We want a PWA
like Notes Offline. Should we convert to the new Blaze skeleton, copy its
worker, or use Workbox? Will the worker save Minimongo and replay edits?"
Pass if the agent keeps React, uses this skill for the worker/build decision,
and distinguishes optional Workbox or an app-owned worker from the new Blaze
starter. It uses Notes Offline as a React/Workbox example with separate
`jam:offline`/`jam:method` data behavior, routes data adoption to
`meteor-community-packages`, and requires offline/update/reconnect and
account-boundary checks. Fail if it treats startup as offline proof, caches
private traffic indiscriminately, or promises worker-provided method replay.
## Case 27: new pnpm workspace starter
Prompt: "Start a Meteor 3.6-beta.0 pnpm workspace with shared client and server
packages. Where is the Meteor app, how do I start it, and does the pnpm
skeleton include PWA offline behavior?"
Pass if the agent uses `meteor create --release 3.6-beta.0 --pnpm <name>`,
identifies `apps/app` and `packages/`, and explains the root start script
without switching dependency ownership to npm. It preserves the root pnpm
pin and lockfile, runs direct Meteor commands from the app, and treats PWA
as separate work. Fail if it invents offline support or requires global pnpm
when Corepack supplies the pinned version.
## Case 28: skeleton selection is not flag composition
Prompt: "For a new Meteor 3.6-beta.0 app, should I use --react, --typescript,
--svelte, --pnpm or --pwa? Can I combine --react --pnpm --pwa to get all three?
Does meteor create --list show every skeleton?"
Pass if the agent distinguishes framework choice, workspace layout and PWA
requirements, preserves the requested framework, and explains that `--pwa`
selects a Blaze starter rather than a generic modifier. It checks the selected
release's CLI/generated files instead of inventing composable flags, and
distinguishes the examples list from skeleton discovery. Fail if it promises
every skeleton enables the same stack or silently chooses another framework.
## Case 29: PWA setup on an earlier stable release
Prompt: "Our React app must remain on Meteor 3.5.2 with @meteorjs/rspack 2.2.0.
Can we still use Workbox for a PWA, or does all PWA support require the new
Meteor 3.6 --pwa option?"
Pass if the agent keeps the pinned app, explains that Workbox/app-owned
workers are independent of the new Blaze starter, and identifies the
Meteor 3.4.1/v2 floor for documented worker persistence helpers. It preserves
the paired integration and tests dev/production worker behavior separately
from offline data. Fail if it requires upgrading to 3.6, running a scaffold
over the app, or installing a newer integration major on its own.
## Case 30: narrower worker scope is valid
Prompt: "Our Meteor 3.6 React PWA is under /portal/ but serves its worker at
/sw.js. Can we register that worker with scope /portal/, or must we move it?
What if /portal/sw.js instead requests scope /?"
Pass if the agent allows the root script's narrower `/portal/` scope, explains
that the default is the script directory, and distinguishes a broader scope
requiring the worker response's `Service-Worker-Allowed` header. It checks
actual registration and avoids unnecessarily broad control or an automatic
prefix rewrite. Fail if it requires moving a root worker to narrow its scope
or treats broader-than-directory scope as always impossible or unrestricted.
## Case 31: beta.1 pairing and declaration boundary
Prompt: "Configure Rspack on a new Meteor 3.6-beta.1 TypeScript app with autoInstallDeps false. Does SWC generate native Meteor declarations and type-check it automatically?"
Pass if the agent: Uses rspack 1.4.0-beta360.1/@meteorjs/rspack 3.0.0-beta.2 and Rspack core/CLI/dev-server 2.2.0 minimums, prepares dependencies with the existing manager and keeps frozen CI. Separates transpilation, explicit native opt-in and local tsc; new templates retain legacy providers. Does not remove zodern:types as a bundler requirement.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 32: standalone declaration resolution near miss
Prompt: "Our Meteor 3.6-beta.1 bundler works, but meteor/random is any in the editor and local tsc skips our app files. We want type resolution repaired, with no SWC or Rspack migration."
Pass if the agent hands provider/configuration and source-set checking to
meteor-typescript, preserves working build/checker integration and does not
change loaders merely because the app uses TypeScript.
## Case 33: Current 3.6 dependency set
Prompt: "Configure the dependencies for our existing Meteor 3.6-beta.3 React app in a pnpm workspace. autoInstallDeps is false. Give the correct minimums and where to prepare the lockfile; native types already work."
Pass if the agent uses rspack 1.4.0-beta360.3 / @meteorjs/rspack 3.0.0-beta.3, core/CLI 2.2.7, dev server 2.2.1, SWC 1.16.2, Rsdoctor 1.6.4, helpers 0.5.23 and refresh 2.0.2/0.19.0; respects opt-out and workspace ownership.
Fail if it copies beta.1 minimums, creates an app npm lockfile, rewrites CI dependencies, or changes declaration providers.
## Case 34: Separate legacy program
Prompt: "On Meteor 3.6-beta.3 with its paired Rspack packages, create a small legacy-browser notice beside our modern app. The notice imports one npm dependency. Explain config, compilation, reload behavior and how to test it."
Pass if the agent selects explicit legacy mainModule with shared config, distinguishes callback arch/isLegacy from runtime flags, enables legacy development, addresses npm transpilation separately from ES5/polyfills and tests delivery plus actual engines.
Fail if it overwrites reserved entry/output, invents rspack.legacy.config.js discovery, imports the modern bootstrap unnecessarily or promises ES5 supplies browser APIs.
## Case 35: Earlier architecture near miss
Prompt: "We are pinned to Meteor 3.6-beta.1 and cannot update. Can copying beta.3 mainModule.legacy and Meteor.isLegacy guidance provide a separate Rspack legacy application?"
Pass if the agent explains the complete flow is not present on beta.1 and preserves the constrained shared-client behavior; may describe a future compatible upgrade separately.
Fail if it promises the beta.3 architecture flow or silently updates the app.
## Case 36: Root generated ignores and live rules
Prompt: "Beta.3 Rspack tests report zero cases. We have root test/ data, generated _build/test/ and edited .meteorignore exceptions while meteor test was running. How should we inspect the rules?"
Pass if the agent separates generated root exclusions from user last-match rules and included parents, checks actual versions and rule invalidation, preserves handoff visibility and expected test names/counts.
Fail if it copies internal METEOR_IGNORE variables, ignores _build, or accepts zero tests as green.
@@ -1,126 +0,0 @@
# Meteor 3.6 dependencies and workspaces
Workspace integration starts with Meteor 3.6-beta.0; the current target is
beta.3. Select the [release pairing](rspack-config.md); `tools-core` has the
same version as `rspack` for these betas. Inspect the manifest and workspace
lockfile. Earlier 3.x releases retain their manually managed workspace setup.
## Rspack 2 dependency set
| Package | Minimum selected by 3.6-beta.3 | Dependency category |
|---|---|---|
| `@meteorjs/rspack` | `3.0.0-beta.3` | Development |
| `@rspack/core`, `@rspack/cli` | `2.2.7` each | Development |
| `@rspack/dev-server` | `2.2.1` | Development |
| `@swc/core` | `1.16.2` | Development |
| `@rsdoctor/rspack-plugin` | `1.6.4` | Development |
| `@swc/helpers` | `0.5.23` | Runtime |
| React only: `@rspack/plugin-react-refresh`, `react-refresh` | `2.0.2`, `0.19.0` | Development |
Beta.0/beta.1 retain core/CLI/dev-server 2.2.0, SWC 1.15.32,
Rsdoctor 1.5.9, refresh plugin/runtime 2.0.0/0.17.0 and
`@meteorjs/rspack` 3.0.0-beta.1/beta.2 respectively. Do not copy beta.3's
minimums into a deliberately pinned earlier target.
`swc-loader@0.2.7` is a separately selected dependency when the beta.3 integration
needs it. Do not confuse the Meteor npm integration's major 3 with Rspack's
major 2. Do not substitute unreleased stable `@meteorjs/rspack@3.0.0` for this
beta's pin. Later releases require checking their own resolved pairing.
Automatic installation updates the coordinated set. With
`meteor.autoInstallDeps: false`, inspect the warnings and prepare the changes
locally with the detected manager. `meteor update --npm` explicitly overrides
the opt-out for that invocation; keep it out of immutable CI builds.
On npm apps with installed Rspack 1.x core, CLI, or React Refresh peers,
the beta's automatic transition uses `--legacy-peer-deps`. Its manual warning
can omit that flag. If the reported dependency update fails with the confirmed
old-peer conflict, apply the flag only to that coordinated npm install and
verify the resulting tree. Do not set a global npm option, add the flag to
pnpm/Yarn, or suppress unrelated peer errors. Prove the locked CI install
works; if that lockfile requires the same npm flag, document it in that app's
CI command and revisit it after the transition.
## Create a pnpm workspace
```bash
meteor create --release 3.6-beta.3 --pnpm my-workspace
cd my-workspace
meteor npm start
```
Inspect the generated structure:
```text
package.json # packageManager pin and root scripts
pnpm-workspace.yaml
pnpm-lock.yaml
apps/app/.meteor/release # Meteor commands target this app
apps/app/package.json # app dependencies and workspace:* links
packages/domain/ # shared npm package
packages/server-tools/ # server-only npm package
packages/ui/ # client npm package
```
Creation installs through pnpm, using Corepack when available. A global pnpm
installation is not required when Corepack can supply the pinned version.
`meteor npm start` runs the root script; it does not make npm the workspace's
dependency manager. Run direct Meteor commands from `apps/app`.
For a Meteor 3.5.2 or earlier app that must stay pinned, do not use `--pnpm`
or promise the new detection. Keep its established workspace and manager,
prepare dependencies explicitly, and verify linked imports and builds.
## Preserve installation ownership
1. Find the workspace root, root `packageManager`, workspace manifest and
lockfile. The root manager takes precedence over the nested app's hint.
2. Install app dependencies from the Meteor app directory with that manager,
so the app manifest and shared workspace lockfile change together. Do not
add them to the root manifest or create a competing `package-lock.json`.
If conflicting hints or lockfiles already exist, inspect their history and
preserve local changes before selecting an authority. Do not delete an
existing lockfile or `node_modules` merely because npm was mentioned.
pnpm can legitimately create `apps/app/node_modules` links; a shared root
lockfile does not require a root-only `node_modules` tree.
3. Keep `file:`, `link:`, `portal:` and `workspace:` declarations when they
are intentional. Check the actual installed package version and linkage;
the protocol text is not a semver range. Repair missing links or an
incompatible source version instead of replacing every link with a
registry dependency.
4. npm, pnpm and Yarn can auto-install. Other declared managers receive
manual guidance without automatic mutation. A failed pnpm/Yarn executable
can fall back to Corepack; inspect its error rather than switching managers.
5. Review both manifests and the authoritative lockfile, then use a frozen
install from the workspace root in CI: `pnpm install --frozen-lockfile`,
`yarn install --immutable` for modern Yarn, or the project's npm workflow.
Yarn Classic uses `--frozen-lockfile`. Include build-time dev dependencies.
Keep default symlink resolution for packages imported by name. Only an
app-local source symlink that needs its apparent location calls for
`resolve.symlinks: false`. Test shared client/server imports, an edit to a
linked package, client/server suite counts, and an extracted production bundle.
Move the bundle outside the checkout and test used workspace `.bin` commands
and adjacent resource reads without source access. Beta.3 repairs copied
command links, including cross-workspace links; verify older tools explicitly.
Keep generated links untouched and preserve the root manager/lockfile.
## Test selection and generated ignores
Verified on the beta.3 pairing; beta.0/beta.1 lack the complete fixes.
| Rule source | Decision |
|---|---|
| `.meteorignore`, then user `METEOR_IGNORE` | Last matching rule wins for Rspack test discovery. `!` can re-include a file only when its parents remain included. |
| Integration-generated exclusions | Scoped to the app root and entrypoint; distinct from user patterns. A root `test/` folder must not hide `_build/test/`. Do not set private `METEOR_IGNORE_*` variables to repair this. |
| Explicit user rule hiding the active build context | Still a configuration error. Keep Meteor-facing generated entries readable. |
| Edited ignore file during watch | Beta.3 invalidates the cached source scan. Check an actual inclusion/exclusion change and expected test names/counts. A zero-test exit is not success. |
Use `meteor-testing` for setup. On a constrained earlier integration, use a
verified explicit test entry/import graph when eager discovery fails; keep
production source loading unchanged.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
@@ -1,246 +0,0 @@
# Meteor Bundler Optimizations
`"meteor": { "modern": true }` in `package.json` enables: SWC transpiler,
SWC-based minifier, modern watcher, web-arch skipping in development. All
fall back to legacy behavior on incompatibility.
## Transpiler (SWC)
SWC replaces Babel for `.js`, `.jsx`, `.ts`, `.tsx` across app, npm, and
Atmosphere packages. Faster, no Fibers tax.
### Verbose output
```json
"meteor": {
"modern": {
"transpiler": { "verbose": true }
}
}
```
Each file logs which transpiler ran. Babel fallbacks log
`[Transpiler] Used Babel for <file> (<context>) Fallback`.
### Excluding files from SWC
When a file is known-incompatible, skip SWC entirely to avoid the fallback
overhead.
```json
"meteor": {
"modern": {
"transpiler": {
"excludeApp": ["\\.jsx"]
}
}
}
```
`excludeApp`, `excludeNodeModules`, `excludePackages`, `excludeLegacy`:
each accepts `true` (always Babel) or an array of paths/regex-like
patterns.
### Externalize SWC helpers
```bash
meteor npm install --save @swc/helpers
```
Meteor's pipeline detects it and emits imports for shared helpers instead
of inlining `_extends`, `_objectSpread`, etc. into every file. Preinstalled
on new apps. No `.swcrc` change is normally required. If only a production or
legacy build fails on a helper import, compare the source, Rspack output,
generated Meteor-facing module, and final bundle before changing helper config.
The later Meteor assembly can transform generated Rspack output too.
### Custom `.swcrc`
Lookup order: `.swcrc` > `swc.config.js` > `swc.config.ts`. Only the
first match is used. File name must be exactly `.swcrc`.
Add SWC plugins, JSX-in-JS support, or React runtime config here.
```json
{
"jsc": {
"parser": { "syntax": "ecmascript", "jsx": true },
"transform": {
"react": { "runtime": "automatic" }
}
}
}
```
For TypeScript: `"syntax": "typescript"` and `"tsx": true`.
### Import aliases via SWC
```json
{
"jsc": {
"baseUrl": "./",
"paths": { "@ui/*": ["ui/*"] }
}
}
```
SWC resolves aliases for `import`. It does NOT resolve aliases for
`require(...)` calls. Use an `import` or a relative path for those.
For dynamic aliases by env, use `swc.config.js`:
```javascript
var mode = process.env.MODE_ENV;
module.exports = {
jsc: {
baseUrl: "./",
paths: mode === "USER" ? { "@ui/*": ["user/*"] }
: { "@ui/*": ["admin/*"] },
},
};
```
### Transform-imports plugin
To shrink full-package imports (e.g. lodash):
```bash
meteor npm install -D @swc/plugin-transform-imports
```
```json
{
"jsc": {
"experimental": {
"plugins": [[
"@swc/plugin-transform-imports",
{
"lodash": {
"transform": "lodash/{{member}}",
"preventFullImport": true
}
}
]]
}
}
}
```
Rewrites `import { map } from "lodash"` into `import map from "lodash/map"`.
### Private class fields
SWC parses `#privateField`, `#privateMethod()`, static private members
natively. No `.swcrc` change required. Babel does not parse them in Meteor;
SWC does.
### Common Babel fallback causes
| Cause | Fix |
|------------------------------------|--------------------------------------------------------------|
| Nested imports | Move to top-level, or use dynamic `import()` / `require`. |
| JSX in `.js` files | Add `jsc.parser.jsx: true` in `.swcrc`. |
| Babel-only plugin (e.g. React Compiler) | Either keep Babel via `excludeApp: true`, or wait. |
| Custom babel-plugin-module-resolver | Move aliases to `.swcrc`'s `jsc.paths`. |
## Minifier (SWC-based)
Replaces Terser in production builds. Same flag (`"modern": true`). Opt out:
```json
"meteor": {
"modern": { "minifier": false }
}
```
This flag controls Meteor's standard minifier path. If `.meteor/packages`
contains a third-party package that provides the JavaScript minifier, do not
assume the flag replaces it. Rspack compiles app modules, then Meteor still
assembles and minifies the final bundle. Compare production output with and
without the custom package before choosing one implementation.
## Watcher (`@parcel/watcher`)
Native cross-OS file watcher. Opt out:
```json
"meteor": {
"modern": { "watcher": false }
}
```
For WSL, remote volumes, or unstable inotify, force polling:
```bash
METEOR_WATCH_FORCE_POLLING=true meteor run
METEOR_WATCH_POLLING_INTERVAL_MS=1000 METEOR_WATCH_FORCE_POLLING=true meteor run
```
Polling burns CPU but is the reliable option in those environments.
## Web Arch (dev only)
`"modern": true` makes development skip `web.browser.legacy` and
`web.cordova`. Equivalent to `--exclude-archs web.browser.legacy,web.cordova`.
Opt out:
```json
"meteor": {
"modern": { "webArchOnly": false }
}
```
This only affects development. To drop legacy from production, add
`modern` to `.meteor/platforms`:
```text
server
browser
modern
```
## .meteorignore
`.gitignore` syntax. Place at any directory level; applies to the subtree.
Lets Meteor skip docs, design assets, infra, test runners, scripts.
```gitignore
docs/
design/
mockups/
cypress/
playwright/
scripts/
tools/
*.md
!README.md
```
Subdirectory `.meteorignore` files are honored; for example one inside
`packages/<pkg>/` scopes only to that package's tree.
For per-command rules without committing the file, use the
`METEOR_IGNORE` environment variable.
Do not synchronize `.gitignore` and `.meteorignore` mechanically. Gitignored
Rspack build contexts contain generated main and test modules that Meteor reads
during final assembly, so they must remain visible to Meteor. For performance,
report large unrelated trees that Git ignores but Meteor still scans, then add
anchored `.meteorignore` rules only after proving they are not application or
test inputs.
## Profiling
Run `meteor profile` before and after enabling `"modern": true` to
quantify the improvement.
## Troubleshooting
- `meteor reset` clears the build cache.
- Do not delete `.meteor/local/` to repair a build: it also contains the local
database. `meteor reset` preserves that data; database deletion requires an
explicitly disposable target and authorization.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/meteor-bundler-optimizations.md
@@ -1,386 +0,0 @@
# Customizing `rspack.config.js`
The `rspack` Atmosphere package generates a `rspack.config.js` at install
time. Edit it with `defineConfig` from `@meteorjs/rspack`. Accepted names are
`rspack.config.js`, `rspack.config.ts`, `rspack.config.mjs`, and
`rspack.config.cjs`.
Match both integration packages to the Meteor release:
| Meteor | `rspack` | `@meteorjs/rspack` | Capability boundary |
|---|---|---|---|
| 3.4 | `1.0.0` | `1.0.0` | Base helpers, including `extendConfig`, `disablePlugins`, and `RSPACK_DEVSERVER_PORT`. |
| 3.4.1 and 3.5 | `1.1.0` | `2.0.1` | Adds `replaceSwcConfig`, `persistDevFiles`, `enablePortableBuild`, and inherited `TOOL_NODE_FLAGS`. |
| 3.5.1 | `1.2.0` | `2.1.0` | Revised client polyfills and app-extension discovery; retains the v2 helper API. |
| 3.5.2 | `1.3.0` | `2.2.0` | Required-dependency diagnostics, mode isolation, TypeScript config dependency tracking, and full-app/TLA fixes. |
| 3.6-beta.0 | `1.4.0-beta360.0` | `3.0.0-beta.1` | Rspack 2.2.0, SWC React Compiler, workspace-aware installs and stable cache configuration. |
| 3.6-beta.1 | `1.4.0-beta360.1` | `3.0.0-beta.2` | Same Rspack 2 minimums, fixed TypeScript server rebuild lifecycle; Node 26.8.2. |
| 3.6-beta.3 | `1.4.0-beta360.3` | `3.0.0-beta.3` | Core/CLI 2.2.7, dev server 2.2.1, separate architecture graphs and corrected test ignores; Node 26.8.2. |
Inspect `.meteor/versions`, `package.json`, and the lockfile. Do not install an
arbitrary `@meteorjs/rspack` major to obtain one helper; upgrade the Meteor
release and its paired dependencies.
## Required npm dependencies
With `rspack@1.3.0` and `tools-core@1.3.0` (Meteor 3.5.2), the shared manager
checks required minimums even when `meteor.autoInstallDeps` is `false` in
`package.json`. With automatic installation enabled, it installs missing or
outdated dependencies and reports changes. A satisfied dependency set is quiet.
During an ordinary build with automatic installation disabled, it prints the missing/outdated versions
and manual install commands without changing project dependencies. It continues
the build, which can still fail because those dependencies are missing. Treat
the warning as a dependency problem, not as a successful compatibility check.
An explicit `meteor update --npm` overrides the opt-out for that invocation
without changing the stored flag. Use it during authorized dependency
preparation; keep it out of an immutable CI build.
```json
{
"meteor": {
"autoInstallDeps": false
}
}
```
For the 3.5.2 pairing, the core minimums are `@rspack/core` and `@rspack/cli`
1.7.1, `@meteorjs/rspack` 2.2.0, `@rsdoctor/rspack-plugin` 1.5.7, and
`@swc/helpers` 0.5.17. Keep `@swc/helpers` in runtime dependencies; the others
are build-time dev dependencies. React adds its detected refresh dependencies.
Use the versions and categories reported by the resolved integration instead
of copying these minimums to another release.
Automatic installation and the opt-out already exist in Meteor 3.5.1. That
release skips the checks when opted out and does not provide the new warning
contract. Inspect its dependencies manually or upgrade the paired integration.
For reproducible CI/Docker, resolve dependencies locally, review and commit
`package.json` and its lockfile, and use `meteor npm ci` for npm apps in the build stage
with dev dependencies available. When build-time dependency mutation is
prohibited, keep the opt-out in project configuration and resolve every warning
before CI. Do not rely on a container silently repairing an incomplete lockfile.
For Meteor 3.6-beta.0's coordinated npm peer transition, new dependency minimums,
pnpm scaffold and workspace-owned installs, read
[3.6 dependencies and workspaces](meteor-3.6-workspaces.md).
Keep the existing manager and its frozen-install command in a workspace.
## Rspack 2 configuration boundary
Meteor 3.6-beta.0 supplies CSS through `css/auto`, persistent options under
top-level `cache`, `externalsType: "commonjs2"`, and compatible output settings.
Preserve those defaults. Use `migrate-to-rspack` to review app overrides that
still contain `experiments.css`, `experiments.cache`, `output.libraryTarget`,
or a hand-written `webpack-merge` integration.
Rspack 2's built-in SWC loader no longer discovers `.swcrc` itself, but
`@meteorjs/rspack@3.0.0-beta.1` still reads Meteor's `.swcrc`, `swc.config.js`
or `swc.config.ts` and passes options to the loader. Do not remove a working
Meteor SWC file based only on the generic Rspack migration guide. Inspect the
effective configuration; extend it with `Meteor.extendSwcConfig`.
## Configuration example
On Meteor 3.6-beta.3's pairing, use `Meteor.arch` and `Meteor.isLegacy` in
the config callback for explicit architecture compilations. These are not
runtime APIs. Read [architecture entry points](architecture-entrypoints.md)
before selecting a legacy graph or npm transpilation rules; beta.0/beta.1
do not supply the complete flow.
```javascript
const { defineConfig } = require('@meteorjs/rspack');
const { rspack } = require('@rspack/core');
module.exports = defineConfig(Meteor => ({
plugins: [
Meteor.isClient && new rspack.ProvidePlugin({ _: 'lodash' }),
new rspack.ProgressPlugin(),
].filter(Boolean),
}));
```
## Flags on the `Meteor` parameter
| Flag | Type | Meaning |
|------------------|---------|------------------------------------------------------|
| `isDevelopment` | boolean | dev mode |
| `isProduction` | boolean | prod mode |
| `isClient` | boolean | building client code |
| `isServer` | boolean | building server code |
| `isTest` | boolean | test mode |
| `isDebug` | boolean | debug mode |
| `isRun` | boolean | `meteor run` |
| `isBuild` | boolean | `meteor build` |
| `swcConfigOptions` | object | project-level SWC config (reuse in custom loaders) |
| `assetsContext` | string | name of the build-assets folder |
| `chunksContext` | string | name of the build-chunks folder |
## Helpers
### `extendConfig`
Deep-merge reusable or conditional Rspack configuration fragments without
replacing sibling nested keys:
```javascript
module.exports = defineConfig(Meteor => ({
...Meteor.extendConfig(
{ resolve: { alias: { '@ui': '/imports/ui' } } },
Meteor.isClient ? { module: { rules: [clientRule] } } : {},
),
}));
```
Use direct properties for one small config. Use `extendConfig` when composing
multiple nested fragments or presets. Inspect verbose final config to confirm
the merge result.
### `extendSwcConfig` and `replaceSwcConfig`
Both apply only to app code (Meteor packages keep their own SWC config).
`extendSwcConfig` exists in Meteor 3.4+. `replaceSwcConfig` requires Meteor
3.4.1+ and `@meteorjs/rspack` v2.
```javascript
// Smart-merge custom options onto Meteor's SWC defaults
...Meteor.extendSwcConfig({
jsc: { parser: { decorators: true } },
})
```
```javascript
// Replace Meteor's SWC config entirely. You own React-refresh, helpers, etc.
...Meteor.replaceSwcConfig({
jsc: {
parser: { syntax: 'typescript', tsx: true, decorators: true },
target: 'es2020',
transform: { react: { runtime: 'automatic' } },
},
})
```
Prefer `extendSwcConfig`. `replaceSwcConfig` requires re-supplying React
refresh, external-helpers, etc. that Meteor sets up via `Meteor.swcConfigOptions`.
### `compileWithRspack` / `compileWithMeteor`
Routes specific npm deps to one bundler or the other.
```javascript
module.exports = defineConfig(Meteor => ({
// Force Rspack/SWC to recompile a modern or local package
...Meteor.compileWithRspack(['grubba-rpc']),
// ES5 target for one dep
...Meteor.compileWithRspack(['zod'], { jsc: { target: 'es5' } }),
// Mark deps as externals so Meteor/Node load them at runtime
...(Meteor.isServer ? Meteor.compileWithMeteor(['sharp']) : {}),
}));
```
Use `compileWithMeteor` for:
- Native or binary deps (e.g. `sharp`).
- Atmosphere-package internals.
- `thread-stream` and similar worker-loading dependencies reached through
logging stacks such as `pino`. Fix
`Cannot find module '/_build/main-dev/lib/worker.js'` by adding
`thread-stream` to `compileWithMeteor`.
### `splitVendorChunk`
Splits `node_modules` into a stable `vendor` chunk to avoid duplicating
shared deps across async chunks.
```javascript
module.exports = defineConfig(Meteor => ({
...Meteor.splitVendorChunk(),
}));
```
For finer control, drop the helper and use Rspack's official
`splitChunksPlugin` config.
### `persistDevFiles` (Meteor 3.4.1+)
Rspack dev server keeps build output in memory. If Meteor's web server has
to serve a file (e.g. a Workbox-generated `sw.js`), persist it.
```javascript
// every rebuild
...Meteor.persistDevFiles(['manifest.json'])
// or split strategies
...Meteor.persistDevFiles({
once: ['sw.js'], // first build only; rewriting re-registers SW
always: ['manifest.json'],
})
```
Matchers: strings (`endsWith`), RegExp, or functions. HTML files persist
unconditionally.
| Strategy | When |
|----------|---------------------------------------|
| `always` | every build. Default for array form. |
| `once` | first build only. Use for service workers and any file whose rewrite would cascade a full reload. |
### `setCache`
```javascript
...Meteor.setCache(false) // disable
...Meteor.setCache('memory') // in-memory only
// default: persistent
```
Disable only when investigating Rspack cache bugs or OOM. Persistent is
the rebuild-speed default.
On `@meteorjs/rspack@2.2.0` (Meteor 3.5.2), a TypeScript config and its
resolvable relative local imports participate in persistent-cache dependency
tracking. Literal static imports, `import('./local')`, re-exports, and
`require('./local')` are detected. This does not promise tracking of computed
paths, arbitrary aliases, or modules outside the app. Older integrations may
miss TypeScript dependencies; upgrade before retaining a cache workaround.
If a config edit appears stale, inspect the resolved config/import paths and
rebuild first. Clear only a confirmed stale Rspack cache; use the recovery flow
in `migrate-to-rspack` instead of disabling caching permanently.
### `disablePlugins`
Match by constructor name string, RegExp, or predicate.
```javascript
...Meteor.disablePlugins([
'DefinePlugin',
/Html/i,
p => p?.constructor?.name === 'CustomConsoleLogPlugin',
])
```
### `enablePortableBuild` (Meteor 3.4.1+)
Default: `Meteor.isDevelopment` and `Meteor.isProduction` are replaced at
build time, enabling dead-code elimination of dev-only blocks.
```javascript
...Meteor.enablePortableBuild()
```
Keeps both as runtime checks. Bundle gets larger; dev/prod branches both
ship. Use only when one bundle must run in both environments without
rebuilding.
`Meteor.isClient`, `Meteor.isServer`, `Meteor.isTest` are always replaced
at build time regardless of this flag.
## Custom `HtmlRspackPlugin`
Replace or extend the default plugin to inject `<meta>` tags, CSP, etc.
```javascript
module.exports = defineConfig(Meteor => ({
plugins: [
Meteor.HtmlRspackPlugin({
meta: {
viewport: 'width=device-width, initial-scale=1, shrink-to-fit=no',
'theme-color': '#4285f4',
},
}),
],
}));
```
A `client/main.html` (or whatever the entry folder uses) still applies
customizations through Meteor's HTML pipeline.
## Dev server port
`rspack.config.js`'s `devServer.port` is reserved. Use the env var:
```bash
RSPACK_DEVSERVER_PORT=3232 meteor run
```
Meteor manages the Rspack dev server so it can coordinate with Meteor's
own server; the port must be passed through env so both processes agree.
## Logging knobs
```javascript
module.exports = defineConfig(Meteor => ({
stats: 'detailed',
infrastructureLogging: { level: 'info' },
}));
```
`stats` controls bundle info per compilation. `infrastructureLogging.level`
controls HMR verbosity in terminal and browser; off by default.
To see the final config Meteor produces, enable
`"meteor": { "modern": { "verbose": true } }` in `package.json`.
## Reserved config keys
Rspack `entry` and `output` are owned by the integration. Overriding them
triggers warnings. Everything else is fair game.
## Reserved build folders
Do not edit:
- `_build/*`: Rspack entry, intermediate app, overridden Meteor entry.
- `public/build-assets/*`, `private/build-assets/*`: built static assets.
- `public/build-chunks/*`: dynamic-import code splits.
Meteor 3.5.2 adds `-test` and `-app-test` asset/chunk contexts; a
`METEOR_LOCAL_DIR` basename can also suffix contexts. Include actual generated
variants in external formatter, linter, test, and IDE ignores. Keep the active
build handoff visible to Meteor itself.
Auto-added to `.gitignore`. To rename, set in `package.json`:
```json
{
"meteor": {
"buildContext": "build",
"assetsContext": "assets",
"chunksContext": "chunks"
}
}
```
## TypeScript declarations
Rspack/SWC transpiles TypeScript but does not type-check it or select Meteor
package declarations. Meteor 3.6-beta.1 native declarations require explicit
`meteor types` and provider configuration. Ordinary builds and new templates
retain legacy providers. Keep working `zodern:types`/`@types/meteor` setups
unless the task includes a provider migration; run the app's local `tsc`
separately. A configured checker such as the TypeScript scaffold's
`TsCheckerRspackPlugin` is a separate layer that can check during builds;
preserve it when working. See the
`meteor-typescript` skill for provider configuration and checking.
If it is not installed, consult the
[declaration guide](https://docs.meteor.com/cli/using-core-types).
## Memory limits
Rspack runs as a child process and may OOM on large apps. Raise the heap
for tool processes temporarily when capturing evidence (Meteor 3.4.1+):
```bash
TOOL_NODE_FLAGS="--max-old-space-size=16384" meteor run
```
On Meteor 3.4.0, use `NODE_OPTIONS="--max-old-space-size=16384"`.
First distinguish a one-shot build failure from growth during a long watch
session. Audit large directories visible to Meteor and check the exact release
for fixes. Test heap size and persistent cache as separate variables; revert a
change that does not improve the failure or a measured memory trend.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
@@ -1,74 +0,0 @@
# Scaffolds and service workers
Choose framework, workspace layout and offline requirements separately.
Inspect the app's release, resolved packages, lockfile and existing worker.
Enabling `meteor.modern` or adding Rspack does not itself make an app a PWA.
## Choose a starting point
These starters are documented for `3.6-beta.0`. Check the selected release's
[CLI documentation](https://docs.meteor.com/cli/#meteorcreate) and generated
files rather than treating this as an exhaustive compatibility matrix.
| Need | Starting point | Follow-through |
|---|---|---|
| React or React/TypeScript | `--react` (default), `--typescript` | `meteor-react`; see CLI docs for Tailwind, Chakra UI and Apollo variants. |
| Blaze | `--blaze` | `meteor-blaze` |
| Other frameworks | `--vue`, `--svelte`, `--solid`, or the documented alternative | Preserve the chosen framework; inspect its entries and loaders. |
| pnpm workspace | Meteor 3.6+: `--pnpm` | [Workspace ownership](meteor-3.6-workspaces.md); app at `apps/app`, shared packages under `packages/`. |
| New Blaze PWA | Meteor 3.6+: `--pwa` | `meteor-blaze`, `references/pwa-scaffold.md`: dependency-free worker, manifest, offline page. |
| Existing app | Keep the app and worker | `migrate-to-rspack` when changing bundlers or upgrading Rspack 1 to 2. |
Starter flags are not composable feature switches. `--pnpm` does not add
offline support; `--pwa` is not a React/workspace modifier. Smaller starters
such as `--minimal` may omit Rspack. `meteor create --list` lists examples,
not skeleton flags. Never scaffold over an existing app.
Meteor 3.5.2 and earlier do not have these new `--pnpm`/`--pwa` starters.
Keep existing/manual workspace and worker setups when the release must stay
pinned; pnpm and PWA support themselves are not exclusive to 3.6.
## Framework-neutral PWA build setup
Workbox and app-owned workers are framework-neutral. Preserve a working
implementation and verify the installed plugin's Rspack compatibility.
For Meteor 3.4.1+ with `@meteorjs/rspack` v2 or a later release-paired
integration, follow Meteor's
[service-worker guidance](https://docs.meteor.com/about/modern-build-stack/rspack-bundler-integration#service-worker)
for client-only `GenerateSW`, runtime caching of app bundles and network-only
HMR updates. Adapt asset/chunk matching and caching to the app.
For a custom generated worker filename, use
[`persistDevFiles`](rspack-config.md#persistdevfiles-meteor-341) with the
`once` strategy; default `sw.js` is already handled. Rewriting workers on each
rebuild can defeat HMR. Production output is written normally. On Meteor
3.4.0/v1, retain tested direct configuration; do not install another integration
major just to obtain the helper.
Check HTTPS/localhost, registration, manifest URLs and the `ROOT_URL` prefix.
Do not cache HMR/DDP traffic or private responses indiscriminately; clean up
only owned caches. A root `/sw.js` can use narrower scope `/portal/`; broader
than the script directory requires `Service-Worker-Allowed`. See the browser
[scope rules](https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register#scope)
before moving a worker or rewriting a working scaffold's prefix.
## Notes Offline: two separate offline layers
[Notes Offline at the reviewed examples PR #50 revision](https://github.com/meteor/examples/tree/a7f001d3479a6f9088c80fe1016829385e74bfda/notes-offline)
uses React and Workbox for worker/asset caching, plus `jam:offline` and
`jam:method` for data persistence and replay. It is an example, not a universal
cache configuration or an automatically added Meteor 3.6 capability.
Use `meteor-community-packages` and its `references/offline.md` for
selective persistence, replay and logout cleanup. A worker does not provide
those data semantics; IndexedDB alone does not load the shell offline.
Validate development/HMR and the production build under the real URL prefix:
offline reload, uncached routes/chunks, worker/app updates, reconnection and
account changes. Test data replay separately. Startup is not offline evidence.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/community-packages/offline.md
@@ -1,198 +0,0 @@
---
name: meteor-mongo-minimongo
description: >
Use when authoring or debugging Mongo queries in Meteor 3. Triggers on
Mongo.Collection, find/findOne, server async vs client Minimongo sync,
oplog vs change streams, indexes, selectors, modifiers, projections.
Use this skill when the user asks about Mongo on the server or asks about
Minimongo on the client.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: data
tagline: "Write and debug Mongo queries in Meteor 3 (server async vs Minimongo, oplog vs change streams, indexes, selectors, modifiers)."
bundle: ["essentials", "fullstack"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Mongo and Minimongo
Meteor ships two implementations of the Mongo API in one codebase. The server
talks to MongoDB through an async driver. The client runs Minimongo, an
in-memory synchronous Mongo emulator that holds the documents that
subscriptions have shipped.
## Decision flow
1. Where does this code run?
- Server-only: use `await Collection.*Async(...)`.
- Client-only: use `Collection.*(...)` synchronously.
- Isomorphic (`import` in shared code): use `await Collection.*Async(...)`.
On the client the work is local but still Promise-based; on the server it
talks to Mongo.
2. Does the query select more than a page of documents? Add `{ limit, skip }`
and an index that matches the selector.
3. Are you reading from a publication on the client? Use `find().fetch()`
(sync) without `await`. The data is already local.
## Server reads
```javascript
const doc = await Posts.findOneAsync(id);
const list = await Posts.find({ ownerId }, {
fields: { title: 1 }, sort: { createdAt: -1 }, limit: 50,
}).fetchAsync();
const count = await Posts.find({ ownerId }).countAsync();
```
## Server writes
```javascript
const _id = await Posts.insertAsync({ title, ownerId });
await Posts.updateAsync({ _id }, { $set: { title } });
await Posts.removeAsync({ _id });
```
## Client reads (Minimongo)
The async API is isomorphic. Prefer it in shared code so the same line works
on the server.
```javascript
const doc = await Posts.findOneAsync(id); // works in shared/client/server
const list = await Posts.find({ ownerId }).fetchAsync();
```
On the client, the operation reads in-memory Minimongo but the async API still
returns a real Promise. Code after `await` resumes in a later microtask. The
sync API also works client-side, but only there:
```javascript
const doc = Posts.findOne(id); // client-only
const list = Posts.find({ ownerId }).fetch(); // client-only
```
Pick sync when the calling scope is naturally sync and forcing `await`
would cascade async into a render path. Common cases:
- React render functions and hooks that consume reactive data.
- Blaze template helpers.
- Tracker autoruns.
Pick async (`findOneAsync`, `fetchAsync`) when the file might also run on
the server, or the containing function is already `async`.
## Indexes
Indexes are server-side. Create them on app startup:
```javascript
import { Meteor } from "meteor/meteor";
import { Posts } from "/imports/api/posts";
Meteor.startup(async () => {
await Posts.createIndexAsync({ ownerId: 1, createdAt: -1 });
await Posts.createIndexAsync({ slug: 1 }, { unique: true });
});
```
Choose compound-index key order from equality filters, sort fields, range
filters, and usable index prefixes. The JavaScript property order in an
equality selector does not have to match the index. Verify the chosen plan in
the Mongo shell (`meteor mongo`) with
`db.posts.find(...).explain("executionStats")`.
## Reactivity source: oplog or change streams
The core driver boundary is release-specific:
| Meteor | Reactive behavior |
|---|---|
| 3.0 through 3.4 | Uses oplog when `MONGO_OPLOG_URL` is configured; otherwise polling. Core change streams and reactivity-order settings are unavailable. |
| 3.5+ | Chooses a driver per query in the default order below. |
Meteor 3.5+ defaults to:
```text
changeStreams -> oplog -> polling
```
Change streams require MongoDB 6+ on a replica set or sharded cluster, an
unordered observer, no `skip` or `limit`, and a selector Minimongo can compile.
An ineligible query falls through to the next configured driver. Oplog is
available only when `MONGO_OPLOG_URL` is configured.
Meteor 3.6, verified on beta.3's `mongo@2.5.2-beta360.3`, also declines
`$where`/`$near` selectors for Change Streams: live events cannot be re-matched
with MongoDB semantics by Minimongo. Oplog declines these selectors too, so
verify a usable polling fallback. Minimongo-incompatible projections also
require fallback. A MongoDB-supported projection rejected by Minimongo is a
driver boundary, not a reason to rewrite the publication or schema. Verify
fallback before proposing that broader change. Test initial and live results;
do not strip the selector, projection or pagination merely to force Change Streams.
Earlier 3.5/beta.1 packages can choose the wrong driver for `$where`/`$near`;
on a constrained release, use a supported polling configuration or an
authorized compatible upgrade and rerun the exact query.
On Meteor 3.5+, override the app-wide order with
`METEOR_REACTIVITY_ORDER=oplog,polling` or:
```json
{
"packages": {
"mongo": {
"reactivity": ["oplog", "polling"]
}
}
}
```
On Meteor 3.5+, the `disable-oplog` package removes only the oplog step. It
does not disable change streams. Use `reactivity: ["polling"]` to force
polling. On Meteor 3.0 through 3.4, do not add these settings; upgrade first.
For duplicate observer events or intermittent login disconnects under core
change streams, check the resolved `mongo` version before rewriting queries or
disabling reactivity. `mongo@2.5.1` (Meteor 3.5.2) fixes replay of events already
covered by a causal primary snapshot. Earlier 3.5 packages lack that fix;
upgrade and rerun the failing sequence. This does not change driver eligibility
or justify dropping arbitrary application events by timestamp. Capture observer
ordering if the problem persists; use `meteor-debugging` for an unknown cause.
## Collation (Meteor 3.5+)
Use `collation` for locale-aware or case-insensitive selectors and sorting on
both Mongo and Minimongo. Back the server query with an index created using
the same collation:
```javascript
const collation = { locale: "en", strength: 2 };
const users = await Users.find(
{ email: "Alice@Example.COM" },
{ collation },
).fetchAsync();
await Users.createIndexAsync({ email: 1 }, { collation });
```
Minimongo supports `locale`, strength 1 through 3, `caseLevel`,
`numericOrdering`, and `caseFirst`. Other Mongo collation options are
server-only and are ignored by Minimongo.
## Anti-patterns
- Use sync Mongo on the server. Removed in Meteor 3.
- Use sync Mongo (`findOne`, `insert`, `update`, `remove`) in shared code.
Breaks the moment the file is imported on the server.
- Unbounded `find` on the server. Always `limit`.
- Forget `fields` projection when publishing. Always project.
- Assume the async Minimongo API resumes inline. It returns a Promise even
though the underlying read is local.
## See also
- `references/server-vs-client.md`
- `references/selectors-modifiers.md`
- `references/eval-cases.md`
@@ -1,118 +0,0 @@
# Evaluation cases for `meteor-mongo-minimongo`
## Case 1: server-side find rewrite
Prompt: "This used to work in Meteor 2 on the server:
```
const post = Posts.findOne({ slug });
```
Now it returns undefined. Fix it."
Pass if the agent rewrites to `await Posts.findOneAsync({ slug })` and marks
the caller async.
## Case 2: missing index
Prompt: "My `Posts.find({ ownerId, archived: false }, { sort: { createdAt:
-1 } })` query is slow. Suggest an index."
Pass if the agent suggests `{ ownerId: 1, archived: 1, createdAt: -1 }` (or
calls out that `archived` could be omitted if filtering is rare).
## Case 3: Minimongo on client
Prompt: "My component is client-only. Which Mongo API should I use:
`Posts.findOne(id)` or `await Posts.findOneAsync(id)`?"
Pass if the agent says both work on the client and picks based on the
calling scope:
- Async (`findOneAsync`) when the file might ever be imported in
shared/server code, or the containing function is already async.
- Sync (`findOne`) when the scope is naturally sync (React render, Blaze
helper, Tracker computation) and forcing `await` would cascade an async
migration through the component tree for no real gain.
The sync API exists for exactly that case; using it deliberately is not a
mistake. Fail if the agent claims that an async Minimongo Promise resolves
inline or synchronously; only the underlying data access is local.
## Case 4: leaking columns
Prompt: "My subscription includes the `passwordHash` field. I never wanted
that to reach the client. What did I do wrong?"
Pass if the agent identifies missing `fields` projection in the publication
and proposes a `fields: { title: 1, ... }` allow-list.
## Case 5: Meteor 3.5 reactivity driver
Prompt: "After upgrading to Meteor 3.5, is oplog still the default for every
reactive Mongo query? How can I force the old order?"
Pass if the agent gives the default `changeStreams`, `oplog`, `polling` order,
lists the main change-stream eligibility requirements, and uses either
`METEOR_REACTIVITY_ORDER=oplog,polling` or the equivalent
`packages.mongo.reactivity` setting. It must not claim that `disable-oplog`
also disables change streams.
## Case 6: case-insensitive email lookup
Prompt: "On Meteor 3.5, query email addresses case-insensitively on both the
client and server without lowercasing stored values."
Pass if the agent uses `{ collation: { locale: "en", strength: 2 } }` on the
query and creates the server index with the same collation. It should mention
that only a subset of Mongo collation options is supported by Minimongo.
## Case 7: change streams requested before Meteor 3.5
Prompt: "My app is fixed on Meteor 3.4.1 and uses Atlas. Configure core
`changeStreams,oplog,polling` reactivity with `METEOR_REACTIVITY_ORDER`."
Pass if the agent says core change streams and reactivity-order configuration
begin in Meteor 3.5, explains that 3.4.1 uses oplog only with
`MONGO_OPLOG_URL` and otherwise polling, and requires an upgrade before using
the requested core driver. Fail if it assumes Atlas implies core change-stream
support on every Meteor 3 release.
## Case 8: selector property order and compound index
Prompt: "My index is `{ ownerId: 1, archived: 1, createdAt: -1 }`, but the
query object is `{ archived: false, ownerId }`. Must I reorder its JavaScript
properties before Mongo can use the index?"
Pass if the agent says equality selector property order need not mirror the
compound index, checks index prefixes and equality-sort-range behavior, and
uses `explain('executionStats')` to verify the plan. Fail if it treats object
property order as an index-eligibility rule.
## Case 9: change-stream replay during login
Prompt: "On Meteor 3.5.1, observer traces show an event already represented by
the initial primary snapshot replaying and triggering intermittent login
disconnects. Should I drop old events in application code or force polling?"
Pass if the agent checks the `mongo@2.5.1` fix shipped with 3.5.2, proposes a
compatible upgrade and reruns the reproduction before a permanent workaround.
It preserves driver eligibility/fallback rules and does not claim every
disconnect has this cause. Fail if it drops arbitrary events by timestamp or
disables change streams without evaluating the release fix.
## Case 10: Reactive selector fallback
Prompt: "Our Meteor 3.6-beta.3 app uses mongo 2.5.2-beta360.3, Change Streams first, and reactive $near and $where queries. Should I remove these selectors and projections so all queries use Change Streams?"
Pass if the agent preserves semantics, explains local matcher limitations and Change Streams/oplog rejection, verifies polling fallback plus initial and live results; retains skip/limit/projection eligibility checks.
Fail if it forces Change Streams by stripping constraints or says configuring MONGO_OPLOG_URL guarantees these selectors use oplog.
## Case 11: Older selector near miss
Prompt: "The same $near reactive query is wrong on Meteor 3.5.2 and we must stay pinned. Does the beta.3 fix already apply, and what can we try without changing results?"
Pass if the agent checks resolved package/backports, does not claim the fix ships in 3.5.2 and offers supported polling configuration with query/live-update verification.
Fail if it promises fixed automatic eligibility or rewrites away the selector.
@@ -1,43 +0,0 @@
# Selectors, modifiers, sort and field specifiers
## Selectors
```javascript
{ ownerId: userId } // equality
{ qty: { $gt: 0 } } // operators
{ tags: { $in: ["a", "b"] } }
{ $or: [{ qty: 0 }, { archived: true }] }
{ "address.city": "Berlin" } // dotted path
```
## Modifiers
```javascript
{ $set: { title } }
{ $inc: { qty: 1 } }
{ $push: { tags: "new" } }
{ $addToSet: { tags: "new" } }
{ $pull: { tags: "old" } }
{ $unset: { archived: 1 } }
```
## Sort specifiers
```javascript
{ sort: { createdAt: -1 } }
{ sort: [["score", "desc"], ["createdAt", "asc"]] }
```
## Field specifiers
Always project. Returning a whole document leaks columns.
```javascript
{ fields: { title: 1, qty: 1 } } // include only these
{ fields: { secretToken: 0 } } // exclude this; everything else included
```
Mixing `1`s and `0`s in one specifier is invalid except for `_id`.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/collections.md#selectors
@@ -1,22 +0,0 @@
# Server Mongo vs client Minimongo
| Aspect | Server (Mongo, async) | Client (Minimongo, sync) |
|--------------------|-----------------------------------|---------------------------------|
| Read one | `await c.findOneAsync(id)` | `c.findOne(id)` |
| Read many | `await c.find(q).fetchAsync()` | `c.find(q).fetch()` |
| Count | `await c.find(q).countAsync()` | `c.find(q).count()` |
| Insert | `await c.insertAsync(d)` | `c.insert(d)` (inside stub only)|
| Update | `await c.updateAsync(q, m)` | `c.update(q, m)` (stub only) |
| Remove | `await c.removeAsync(q)` | `c.remove(q)` (stub only) |
| Index | `await c.createIndexAsync(...)` | not applicable |
Isomorphic code runs on both sides. Use the async API throughout; on the
client the lookup is local but remains Promise-based, so code after `await`
resumes in a later microtask.
To explain a query, use the Mongo shell (`meteor mongo`) and run
`db.<collection>.find(...).explain("executionStats")`. Meteor does not
expose a `Cursor#explain` on the collection API.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/collections.md
-87
View File
@@ -1,87 +0,0 @@
---
name: meteor-native
description: >
Use when building or maintaining Meteor 3 Android/iOS apps through Cordova.
Triggers on meteor add-platform, android-device, ios-device, mobile-config.js,
Cordova plugins, native signing or store artifacts, and mobile hot code push
compatibility. Use this skill when the task already concerns Meteor's
Cordova app workflow; use meteor-debugging for an unexplained cross-layer
failure and meteor-deployment for the backend. React Native/Expo, Capacitor,
and native Node.js addons are separate workflows.
metadata:
author: meteor
kind: workflow
meteor: ">=3.0"
area: build
tagline: "Build and maintain Meteor 3 Cordova apps for Android and iOS, including plugins, native artifacts, and hot code push."
docs_synced_at: "2026-09-08"
license: MIT
---
# Meteor native apps
Turn the existing Meteor application into a reproducible Cordova build and
verify the requested device or distribution behavior. Meteor manages the web
bundle, Cordova project and platform versions; Android Studio and Xcode provide
native debugging, signing and distribution tools.
## Choose the workflow
1. Read `.meteor/release`, `.meteor/platforms`, `.meteor/cordova-plugins`,
`.meteor/versions`, `package.json`, and `mobile-config.js` when present.
Record host OS, target device/platform, installed native binary version,
and whether the task needs a development run, web update, or new binary.
2. Match prerequisites to the selected Meteor release and resolved Cordova
platform. Meteor 3.5.2 uses `cordova-lib@13.0.0`,
`cordova-android@15.1.0`, and `cordova-ios@7.1.1`; earlier releases have
different pins. Do not select the newest standalone Cordova platform
merely because it is available.
3. Choose the relevant reference below. Keep durable changes in the app's
platform/plugin declarations, configuration and assets; inspect generated
native output to verify what Meteor actually produced.
4. Rebuild/reinstall when native plugins, platform versions, permissions or
native configuration change. HCP can update compatible web code/assets;
it cannot supply missing native code or change installed binary metadata.
5. Verify on the target emulator/device or inspect the requested artifact.
Record command, versions, endpoint and observable result. A successful web
build alone does not validate a native app or a signed store artifact.
| Task | Read |
|---|---|
| Set up Android/iOS, add/remove platforms, run a device, choose WebView compatibility | [Toolchain and development](references/toolchain-and-development.md) |
| Change app metadata/assets, native preferences, access rules, plugins, permissions or build overrides | [Configuration and plugins](references/configuration-and-plugins.md) |
| Build Android artifacts or an iOS project, configure signing and prepare distribution | [Build and distribution](references/build-and-distribution.md) |
| Repair mobile update delivery, compatibility rejection, download or reload behavior | [Hot code push](references/hot-code-push.md) |
## Persistent state and runtime boundaries
- `.meteor/local/cordova-build/` is generated by default. If
`METEOR_LOCAL_DIR` is set, resolve the actual local directory before opening
or clearing its `cordova-build` child. Do not erase the whole local state
or local Mongo database to repair a Cordova cache.
- `mobile-config.js` is a build-time configuration file, not an application
module. `App.configurePlugin` supplies installation variables; it neither
installs a plugin nor runs its JavaScript API.
- Call native plugin APIs from client code guarded by `Meteor.isCordova`,
inside `Meteor.startup` or after equivalent device readiness. Meteor's
Cordova startup waits for `deviceready`; browser/server code must retain a
suitable fallback. Startup does not grant OS permissions automatically.
- A physical device's `localhost` is the device. Match `--mobile-server`
during development and `meteor build --server` for distribution to a
reachable endpoint. The embedded WebView's local content server is separate
from the Meteor backend and DDP connection.
## Neighboring workflows
| Request | Owner |
|---|---|
| Unknown crash, stuck data, or failure not yet isolated to native behavior | `meteor-debugging`, then return with the confirmed native boundary |
| Host the backend, configure Galaxy/Docker, deploy server changes, preserve the HCP client bundle | `meteor-deployment` |
| Rspack/SWC/module graph or a native npm addon such as `sharp` | `meteor-modern-build-stack` or `migrate-to-rspack` |
| OAuth provider/login behavior | `meteor-accounts`; use this skill for required Cordova plugin or native configuration |
| Explicit React Native/Expo or Capacitor app | Keep the chosen stack; this skill does not implement those integrations |
## Acceptance
Use [evaluation cases](references/eval-cases.md) to check native decisions,
earlier-release behavior, and neighboring-skill routing.
@@ -1,88 +0,0 @@
# Build and distribution
## Choose the native output and backend
Confirm the added platforms, host OS, app identity/version, installed native
platforms/plugins, production endpoint and intended distribution channel.
Use an output directory outside the app source and inspect existing contents
before choosing a location that the build may replace.
```bash
meteor build ../build-output --server=https://app.example.com
```
Native builds require an explicit `--server` when building an added native
platform. Do not rely on the CLI documentation's localhost default. Match the
URL to the deployed backend's public `ROOT_URL` and account for any explicitly
separate DDP URL. A build-time `DDP_DEFAULT_CONNECTION_URL` overrides the
native DDP endpoint; changing a server environment value later does not by
itself prove that installed clients received a new embedded configuration.
Use `--mobile-settings path/to/mobile-settings.json` when the native build
needs settings. Its `public` values initialize the mobile client; configuration
code can also read build-time `App.settings`. Inspect values intentionally
copied into native configuration and keep server-only credentials out of
plugin variables or assets.
| Command choice | Outcome |
|---|---|
| Default `meteor build ... --server=...` | Build the added native platforms supported by the host, plus the server/web output |
| `--platforms=android` or `--platforms=ios` | Select an already-added native platform; does not install it or provide a missing host toolchain |
| `--packageType=bundle` | Android AAB output; the current default |
| `--packageType=apk` | Android APK output |
| `--server-only` | Skip native app artifacts; retain configured client targets for HCP, including `web.cordova` when applicable |
| `--architecture=...` | Select server bundle architecture; does not enable iOS builds on Linux or choose a phone CPU |
On a release where an option's meaning is uncertain, verify `meteor help
build` for that app's Meteor tool. Preserve the `web.cordova` target on the
backend serving installed clients; a platform-filtered browser build can
accidentally remove the HCP bundle. Use `meteor-deployment` for hosting and
backend rollout.
## Android signing and installation
For the example output path, open `../build-output/android/project/` in
Android Studio. Inspect the generated AAB/APK and build log rather than
assuming that the presence of a project directory proves a successful build
or signing step.
Use the app's existing signing identity and Android Studio's signed bundle/APK
workflow, or its established equivalent in CI. Check application ID, version
code/name, package type, signing certificate and intended backend. Keep
keystores/passwords out of tracked source and logs. A debug APK is not a
release artifact, and an AAB is not directly installed with `adb install`.
Test the appropriate APK or the distribution channel's installed build on the
target device. Reusing the existing app identity/signing setup matters for
updates to already installed applications.
## iOS archive and distribution
On macOS, open `../build-output/ios/project/` in Xcode, using its generated
`.xcworkspace` when present. Meteor produces the Xcode project; it does not
prove a signed IPA exists. Configure the existing bundle identifier, team,
signing/provisioning and build/version values, choose the intended archive
destination, then archive and export/distribute through Xcode or the project's
established CI process.
Verify the resulting archive/export and device installation. A Linux build
can skip iOS with a warning while other outputs succeed; report that as
missing iOS validation, not a completed mobile release.
## Release verification
Check cold launch, target-device plugin/permission behavior, backend/DDP
connection, and a compatible web update for each intended platform. Native
configuration and plugin changes need a newly built and distributed binary;
keep older installed clients compatible with the backend during rollout.
Record the artifact actually produced, whether it is signed and installed,
and any unexecuted steps. Verify current Apple/Google submission requirements
at upload time. Building, signing and uploading are distinct actions; prepare
only the distribution steps requested by the user, using existing credentials
and release processes where available.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/cordova.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/environment-variables.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/app.md
@@ -1,174 +0,0 @@
# Configuration and plugins
## Keep configuration in application sources
`mobile-config.js` belongs at the Meteor app root and executes during the
native build. It is not imported by application startup. Preserve the app's
existing identity and platform-specific configuration when changing one field.
```js
// mobile-config.js
App.info({
id: 'com.example.myapp',
name: 'My App',
version: '1.0.0'
});
App.setPreference('Orientation', 'portrait', 'android');
```
For `BackgroundColor`, use a supported `#` hex value, for example
`App.setPreference('BackgroundColor', '#ffffffff')` for opaque white. Old
examples using `0x...` caused Android build failures during Meteor 3 migrations.
Check the failing resource/preference before treating nearby Gradle deprecation
warnings as the cause. Preserve the intended color and the target platform's
channel ordering. See the [confirmed 3.3.2 repair](https://forums.meteor.com/t/solved-migration-from-2-16-to-3-3-2-break-cordova-android-build/64274/2)
and the current [configuration example](https://docs.meteor.com/api/app).
| Need | App-level source | Check after generation |
|---|---|---|
| ID, display name, version | `App.info` | Native application ID and displayed/build versions; preserve published IDs |
| Platform preference | `App.setPreference(name, value, platform)` | Correct platform section; supported preference for the pinned platform/plugin |
| Icons and splash images | `App.icons`, `App.launchScreens` with project-relative assets | Accepted keys, existing source images, generated resources on target devices |
| Plugin installation variables | `App.configurePlugin(id, variables)` | Exact installed plugin ID and generated native configuration |
| Extra XML / platform resources | `App.appendToConfig`, `App.addResourceFile(src, target, platform)` | Correct generated XML/resource target, without replacing unrelated configuration |
| Native files outside those APIs | App-root `cordova-build-override/`, mirroring the generated Cordova project tree | Narrow override remains compatible with the selected native platform |
Meteor copies build overrides into the generated Cordova project. Prefer the
configuration APIs for values they own; a whole generated `config.xml`, Gradle
file, or project copy can mask future Meteor/platform changes. Rebuild and
inspect output after changing native configuration. Do not treat edits under
`.meteor/local/cordova-build` as the permanent source.
`App.settings` reads the build's settings file, while native client runtime
settings use its `public` subtree. A private settings value becomes exposed
if the build copies it into plugin variables, XML or client assets. Use
client-appropriate identifiers in native config and keep server credentials
on the server; do not log full settings while checking values.
## Network access, navigation, and OS policy
Choose the rule for the requested operation:
```js
// mobile-config.js
App.accessRule('https://api.example.com');
App.accessRule('https://docs.example.com', { type: 'navigation' });
App.accessRule('myapp:*', { type: 'intent' });
```
The default rule type is network access; navigation allows the WebView to move
to a URL; intent permits asking the OS to open it. An intent rule does not
register an inbound deep-link handler. Native allow rules do not configure the
remote server's CORS policy, disable CSP, grant runtime device permissions, or
repair invalid TLS certificates. Inspect the failing layer before widening
access, and keep rules scoped to the required destinations.
For local Android HTTP development, first verify the `--mobile-server` URL.
If logs show cleartext rejection, enable the development endpoint through a
development-specific network-security configuration or the documented
`App.appendToConfig` manifest edit below:
```js
App.appendToConfig(`<edit-config file="app/src/main/AndroidManifest.xml"
mode="merge" target="/manifest/application"
xmlns:android="http://schemas.android.com/apk/res/android">
<application android:usesCleartextTraffic="true" />
</edit-config>`);
```
That example is an application-wide cleartext allowance, not a per-domain
rule. Use it only in the local development build configuration; verify the
release output excludes it and uses the intended HTTPS service. Do not add
wildcard access or a production TLS bypass as an HCP fix.
## Install, configure, and call plugins
Use Meteor's plugin declarations. Replace the identifiers/versions below with
the selected plugin's verified npm ID and compatible exact version:
```text
meteor add cordova:PLUGIN_ID@EXACT_VERSION
meteor remove cordova:PLUGIN_ID
```
Review `.meteor/cordova-plugins` and the generated installed plugin list.
Atmosphere packages can also declare Cordova dependencies; inspect those
requirements if a removed plugin returns or a version is resolved differently.
`meteor npm install` alone does not register a Cordova plugin, and
`App.configurePlugin` only supplies its build-time variables. Consult the
selected plugin's own docs for variables, supported platform versions,
permission declarations, and runtime permission requests.
On Meteor 3.0.x, a plugin's `<dependency>` can trigger lost generated
dependencies and `Cannot find module 'cordova-android'`. The complete tool fix
ships in Meteor 3.1; 3.0.4's initial fix was incomplete. If the app must remain
on an affected release, identify the actual transitive plugin in `plugin.xml`
and declare its compatible exact version through `meteor add cordova:...`.
For the reported `cordova-plugin-screen-orientation@3.0.4` case, that dependency
was `es6-promise-plugin@4.2.2`. Do not add it to unrelated apps or permanently
edit generated `package.json`. On fixed releases, diagnose the installed
dependency graph before applying this historical workaround.
[Resolution and workaround](https://github.com/meteor/meteor/issues/13303),
[complete fix](https://github.com/meteor/meteor/pull/13416).
Native APIs belong in client code after device readiness:
```js
import { Meteor } from 'meteor/meteor';
Meteor.startup(() => {
if (!Meteor.isCordova) return;
// Use the installed plugin's documented API and permission flow here.
});
```
Do not infer readiness from a timer or make browser/server startup depend on
a Cordova global. Meteor's startup guard waits for `deviceready`, not for every
plugin-specific asynchronous operation or permission grant.
If changed plugin variables are not reflected, inspect the generated config
and installed plugin first. Stop the affected build process, preserve native
logs and any untracked IDE work, then remove only the actual generated
`cordova-build` directory if stale native state is confirmed. Re-run the
Meteor build/run command. Never substitute `meteor reset --db` or deletion of
all `.meteor/local` for this recovery.
## Local plugin development
Meteor supports `cordova:PLUGIN_ID@file://...` specifications. Quote the entire
argument when paths contain shell-significant characters. Meteor 3.5.2 fixes
resolution of encoded absolute file URLs and preserves existing raw paths
with reserved characters; verify the intended directory, `plugin.xml` ID and
generated plugin source before rebuilding. Use a real file-URL encoder for an
absolute path, not repeated manual decoding.
Earlier releases can mishandle those paths. If the app must stay pinned, use
a straightforward local path without reserved characters or an independently
verified compatible fix. Local source edits require another `meteor run` or
`meteor build` and a native reinstall as appropriate. Local filesystem paths
also need to resolve in every developer/CI environment; they are not portable
published plugin versions.
## Native launch and status UI
`meteor add mobile-experience` pulls in `mobile-status-bar` and `launch-screen`
defaults. It has no JavaScript API of its own. Configure appearance with the
documented App preferences/assets for the installed plugin/platform; check
actual device behavior when Android system-bar or splash rules change.
To hold the splash for app readiness, use `LaunchScreen.hold()` in native
client code before the normal release point, then call that handle's
`release()` once the intended UI is ready. Release every acquired handle,
including a deliberate error/fallback path; do not wait forever for an
unavailable network resource. Guard native use with `Meteor.isCordova` rather
than promising a browser implementation. A rendered web page is not evidence
that the native launch screen was released.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/app.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/application-structure/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/autoupdate.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/troubleshooting/hot-code-push.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/mobile-experience.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/launch-screen.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/mobile-status-bar.md
@@ -1,307 +0,0 @@
# Evaluation cases for `meteor-native`
Run each prompt in a fresh conversation or disposable project. Keep these
criteria hidden until the run finishes; record observable outcomes separately.
## Case 1: Android setup
Prompt: "Add Android development to our Meteor 3.5.2 app on Linux. We have JDK 17
and SDK 35 installed, but no Android platform in .meteor/platforms yet."
Pass if the agent checks the app release and adds Android through Meteor, installs
SDK Platform 36 and Build Tools 36.0.0 for the 3.5.2 baseline, verifies host paths
and prerequisites, and proposes an emulator/device check. Fail if SDK 35 is
treated as sufficient or a web build is claimed to validate Android.
## Case 2: earlier toolchain boundary
Prompt: "Our Meteor 3.5.1 Android branch must stay pinned. Can we copy all 3.5.2
native prerequisites and run cordova platform add android@latest?"
Pass if the agent preserves Meteor 3.5.1, inspects its platform pins and
requirements, and uses Meteor platform commands. Fail if it forces 3.5.2
prerequisites or installs the newest standalone Cordova platform.
## Case 3: physical device endpoint
Prompt: "Our Meteor 3.5.2 Android app works in the emulator. On my USB phone, it
starts but cannot connect. The native build uses http://localhost:3000;
DDP_DEFAULT_CONNECTION_URL was also set during the last build."
Pass if the agent distinguishes device localhost from the host, chooses a
reachable LAN endpoint, inspects the embedded DDP override, and verifies the
regenerated native configuration. Fail if it uses the standard emulator address as
a universal physical-device fix.
## Case 4: iOS build host
Prompt: "Our Meteor app has Android and iOS platforms. Linux CI reports build
success but produced no IPA. Can --architecture=os.osx.arm64 create it here?"
Pass if the agent explains that iOS archives require macOS and Xcode and
distinguishes server architecture from the native build host. Fail if it claims
Linux success proves an IPA exists or that --architecture supplies Xcode.
## Case 5: persistent native configuration
Prompt: "Update our existing Meteor Cordova app's display name, splash and Android
orientation. Keep its published app ID. My edits to generated config.xml disappear
whenever Meteor rebuilds."
Pass if the agent edits app-root mobile-config.js and source assets, preserves the
published ID, and verifies the regenerated native output. Fail if it makes durable
changes only in generated config.xml.
## Case 6: plugin installation and readiness
Prompt: "I added App.configurePlugin for our chosen camera plugin and called its
API at module top level. It is undefined on the phone and breaks web and server
startup. This code is shared by all clients."
Pass if the agent distinguishes plugin declaration, build-time variables, client
runtime and permission flow. It uses Meteor.isCordova with Meteor.startup or
equivalent readiness and retains browser/server behavior. Fail if configuration
alone installs a plugin or a timer replaces readiness.
## Case 7: narrow generated-state repair
Prompt: "We changed a Cordova plugin's install variables, but the generated config
still has the old values. METEOR_LOCAL_DIR=.meteor/native-local and our local
Mongo data matters. Should we delete .meteor/local and try again?"
Pass if the agent resolves .meteor/native-local/cordova-build, first verifies
stale plugin state, and preserves logs and IDE changes before narrowly
regenerating it. Fail if it deletes all local state, uses meteor reset --db, or
targets the default directory despite METEOR_LOCAL_DIR.
## Case 8: local plugin paths
Prompt: "A local Cordova plugin lives in a directory containing spaces, # and %.
We have an encoded file URL and a raw legacy path. How should we add it on Meteor
3.5.2, and what about our pinned 3.5.1 maintenance branch?"
Pass if the agent verifies plugin identity and path encoding, explains the 3.5.2
fix, and keeps the pinned earlier branch on a simple compatible path or verified
fix. Fail if it repeatedly decodes a raw path, passes an unquoted shell-sensitive
path, or promises local source changes ship without rebuilding.
## Case 9: network policy layers
Prompt: "Our Cordova client needs an HTTPS API, an embedded docs page and an
external custom-scheme link. Local Android HCP also logs cleartext denied. Should
we use App.accessRule('*') and disable certificate checks everywhere?"
Pass if the agent distinguishes access, navigation and intent rules from CORS,
CSP, runtime permissions and TLS. Any broad Android cleartext allowance is limited
to development and verified absent from release output. Fail if it uses wildcard
rules or disables certificate checks as a production repair.
## Case 10: HCP native incompatibility
Prompt: "The server deploy adds a native plugin that installed clients don't have.
Devices say the Cordova platform/plugin versions are incompatible. Can we force
AUTOUPDATE_VERSION so everyone gets the new feature immediately?"
Pass if the agent requires a new binary for the missing native plugin, preserves
backend compatibility during rollout, and rejects a blind version override. Fail
if AUTOUPDATE_VERSION is presented as delivering missing native code.
## Case 11: HCP switch and CSS behavior
Prompt: "Our Meteor Cordova app receives a new HCP version and downloads it, but
our custom window.location.reload() still loads old code. CSS-only deploys reload
too. How do we diagnose this?"
Pass if the agent checks pending-bundle selection before custom reload, describes
Cordova CSS updates as full client reloads, and treats custom
WebAppLocalServer/Reload hooks as version-sensitive. Fail if a plain
window.location.reload is assumed to activate a pending bundle or browser CSS HMR
is promised on native production.
## Case 12: native release artifacts
Prompt: "Prepare release builds for our Meteor 3.5.2 Android/iOS app on a Mac,
using https://app.example.com. We need an Android AAB and an iOS archive for
review, with the existing signing identities. Do not upload yet."
Pass if the agent selects the requested endpoint, inspects the Android AAB and
Xcode archive with existing app/signing identities, and distinguishes generated
projects, signing, device installation and upload. Fail if it claims artifacts or
signing were executed without evidence, installs an AAB with adb install, or
uploads without authorization.
## Case 13: settings exposure
Prompt: "Can mobile-config.js read a value from our mobile settings file to
configure a plugin? The same file has a server API secret and public app settings;
I want to put the server secret into App.configurePlugin."
Pass if the agent distinguishes build-time App.settings from public client
settings and keeps the server secret out of plugin variables, XML and assets. Fail
if a private key is considered secret after embedding in the native app.
## Case 14: modern output and OS compatibility
Prompt: "Did Cordova's default bundle become modern in Meteor 3.3.2 or 3.4? We
also support a pinned 3.3.1 branch. Will meteor.modern.cordova=false let our 3.5.2
Android app run below cordova-android's minimum supported OS?"
Pass if the agent identifies the 3.3.2 capability/opt-out floor, retains the
earlier legacy branch, and notes that affected default configuration must be
verified rather than promising all 3.3.2+ tools emit modern output. It
distinguishes JavaScript compatibility from the native platform minimum OS. Fail
if a legacy bundle is claimed to restore unsupported device OS versions.
## Case 15: splash readiness
Prompt: "Our React-based Meteor Cordova app uses mobile-experience. We hold the
splash until data arrives, but it stays visible offline. Can I import a mobile-
experience API and just wait ten seconds?"
Pass if the agent treats mobile-experience as a package bundle and uses balanced
LaunchScreen.hold/release behavior, including an offline fallback. Fail if it
invents a mobile-experience API or hides missing readiness with a fixed delay.
## Case 16: platform removal
Prompt: "We are dropping iOS from this Meteor app but retaining Android and the
web app. How do we stop Meteor generating the iOS project without losing our
shared plugins or application data?"
Pass if the agent removes only iOS with meteor remove-platform ios and reviews
platform declarations. Fail if it removes shared plugins, Android, the web app or
local data without a separate reason.
## Case 17: neighboring stack exclusions
Prompt: "Two separate tasks: our Expo React Native app consumes a Meteor backend,
and sharp fails in the Meteor server's Docker build. Should either task start by
adding Meteor's Cordova Android platform?"
Pass if the agent preserves the Expo stack and routes the server addon/container
failure to build or deployment guidance. Fail if it adds Cordova to either
project.
## Case 18: stale HCP manifest
Prompt: "Our Meteor 3.2.2 iOS app updates locally but stays on the old client
behind NGINX in production. Android updates. DDP announces the new version, but
the public /__cordova/manifest.json GET has an old version and a cache hit; the
origin GET has the new version. Plugins are unchanged. Fix the update path."
Pass if the agent diagnoses manifest caching, bypasses caching and purges stale
content only for the affected manifest route through the deployment workflow,
preserves hashed-asset caching, and verifies the next version reaches iOS. Fail if
it changes compatibility hashes, TLS policy or native plugins, or disables caching
for every asset.
## Case 19: fresh manifest with plugin mismatch
Prompt: "Our Meteor 3.5.2 iOS client downloads a fresh /__cordova/manifest.json,
whose version matches the origin. Logs reject the update because it adds a plugin
missing from installed clients. Should we apply the NGINX no-cache workaround?"
Pass if the agent rules out stale-manifest caching from the evidence and selects
compatible binary rollout. Fail if it repeats the caching workaround or forces HCP
past the native mismatch.
## Case 20: background color migration
Prompt: "Our Meteor 3.3.2 Android build fails while processing resources. mobile-
config.js has App.setPreference('BackgroundColor', '0xff0000ff'). There is also a
Gradle property-syntax deprecation warning. Should we change Gradle versions?"
Pass if the agent checks the invalid preference as the concrete cause, uses a
supported # hex value while preserving the intended color, and verifies generated
resources/build output. Fail if it blindly changes Gradle or copies an ambiguous
color-name assertion from a forum.
## Case 21: transitive plugin on pinned 3.0.4
Prompt: "Our Meteor 3.0.4 branch must stay pinned this week. Android meteor build
started failing with Cannot find module cordova-android after adding cordova-
plugin-screen-orientation@3.0.4. Its plugin.xml declares es6-promise-plugin@4.2.2,
but the generated dependencies disappear. What durable workaround fits?"
Pass if the agent recognizes the incomplete 3.0.4 fix, keeps the release
constraint, and explicitly declares only the verified transitive plugin through
Meteor. It names 3.1 as the complete tool fix and verifies the next build. Fail if
it edits generated package.json permanently, installs an unrelated global Cordova,
or claims 3.0.4 already fixed it.
## Case 22: plugin failure after the tool fix
Prompt: "A Meteor 3.5.2 Android build cannot find a custom plugin module. The
generated Cordova dependencies are present and that plugin has no es6-promise-
plugin dependency. Should we add es6-promise-plugin@4.2.2 because a closed Meteor
issue says it fixes missing modules?"
Pass if the agent rejects the historical workaround for this evidence and examines
the actual plugin declaration, compatibility and generated source. Fail if it adds
the old dependency or treats every missing-module error as issue 13303.
## Case 23: misleading core-js error
Prompt: "Our Meteor 3.0.4 Cordova app starts in the browser but shows a white
screen after adding accounts-base on Android and iOS. The first exception comes
from url/legacy.js and says core-js is missing. Installing core-js in the app did
not help. .meteor/versions has url@1.3.4. How do we repair it?"
Pass if the agent identifies the URLSearchParams integration fix in url@1.3.5
shipped with Meteor 3.1, checks compatible package/release selection and
overrides, and verifies accounts startup. Fail if it removes accounts, repeatedly
installs app-level core-js, or diagnoses every white screen identically.
## Case 24: runtime iterators versus modern output
Prompt: "Our Meteor 3.4 Vue Cordova app emits modern JavaScript, but Vue Router
and another library fail with Map.entries is not a function or its return value is
not iterable. .meteor/versions has ecmascript-runtime-client@0.12.3. The same
WebView works when browsing the server URL. Should we downgrade Vue or set
modern.cordova=true?"
Pass if the agent distinguishes runtime constructor replacement from
transpilation, inspects the loaded polyfills, and selects the compatible
ecmascript-runtime-client@0.13.0 fix shipped in 3.4.1. Fail if it considers modern
output alone sufficient or blindly downgrades Vue.
## Case 25: runtime fix with a release constraint
Prompt: "Our Meteor 3.2.2 maintenance branch must stay pinned. A Cordova-only
Map.entries failure matches the ecmascript-runtime-client fix, and someone
suggests editing ~/.meteor/packages or copying the whole devel packages folder.
What is the smallest supportable approach?"
Pass if the agent preserves the release constraint, verifies whether the fixed
runtime package can be used compatibly, or scopes a verified app-local backport of
the relevant fix. It tests the supported native and browser clients. Fail if it
forces a release upgrade, edits the global cache or imports unrelated packages.
## Case 26: native Rspack proxy failure
Prompt: "Meteor 3.4 with Atmosphere rspack@1.0.0 works in normal web development.
meteor run android-device produces SockJS Invalid frame header errors in both
Android and a desktop browser attached to that run. The same deployment proxy
works in normal mode. What should we check and change?"
Pass if the agent matches the native run-mode proxy defect, identifies the fixed
Atmosphere rspack@1.1.0 integration shipped in 3.4.1, and verifies compatible
package/release selection plus both clients. Fail if it only changes production
proxy settings, treats Map errors as the same cause, or promises native Rspack
HMR.
## Case 27: absent modern config on older tools
Prompt: "Our Meteor 3.5 Cordova app has no meteor.modern field and METEOR_MODERN
is unset. The generated web.cordova bundle is still legacy. We want modern Cordova
output without changing other build options; another branch intentionally uses
modern.cordova=false. A thread says 3.5 fixed the default."
Pass if the agent distinguishes the 3.3.2 capability from the defaulting defect
fixed in 3.5.1, verifies actual output, and suggests a narrow explicit cordova
setting on the pinned tool or a fixed release. It preserves other options and the
intentional legacy branch, accounting for object-form configuration inheriting
enabled defaults. Fail if it treats the reporter statement as proof for 3.5, sets
every modern feature true, removes the legacy opt-out, or requires a new binary
solely for changing JavaScript output with unchanged native compatibility and
supported WebViews.
@@ -1,73 +0,0 @@
# Native hot code push
## Decide whether the update can use HCP
HCP replaces compatible web code/assets in the installed Cordova shell. It
does not install new native plugins, upgrade Cordova platforms, or alter
native permissions, app identity, icons or signing. A Meteor upgrade can
change the native compatibility contract; do not assume every installed
binary can accept its client bundle.
Compare generated native changes, not merely edited filenames or the Meteor
release label. The compatibility hash covers platform/plugin versions; it does
not capture every native permission or configuration change. Those changes
still need a new binary even when the hash is unchanged.
When a change needs native code/configuration, rebuild and distribute a new
binary and preserve backend compatibility for old installations. Do not make
`AUTOUPDATE_VERSION` or another compatibility override the default way to
silence a platform/plugin mismatch. Such an override needs a verified native
and JavaScript API contract across the installed client population.
## Find the failed stage
Inspect `.meteor/versions` for HCP packages (`hot-code-push`, `autoupdate`,
`reload`) and the native webapp plugin; minimal/custom apps may omit them.
The default `meteor-base` setup supplies HCP. Compare an installed native
build with its intended server, not just with a successful browser reload.
| Stage | Evidence and next decision |
|---|---|
| Backend produced the update | Verify the deployed `web.cordova` bundle and changed version. A `--server-only` deployment can serve HCP; a build excluding that client target cannot. |
| Device reached the server | Check the embedded build URL, `--mobile-server` for local work, public `ROOT_URL`, and any DDP override. Distinguish network/TLS/cleartext failures from compatibility. |
| Client learned the version | Inspect DDP subscription/device logs and changed version hashes. A fixed `AUTOUPDATE_VERSION` must be changed when intentionally delivering another update. |
| Client fetched the current manifest | Compare the version in `/__cordova/manifest.json` through the public proxy/CDN and directly at the origin. Inspect GET response headers and cache hits. If the public manifest is stale, bypass caching for this endpoint and purge its stale copy; keep versioned asset caching separate. |
| Native shell accepted it | Read compatibility rejection logs. A platform/plugin mismatch calls for the native-version comparison and binary rollout above. |
| Assets downloaded | Check the failing URL, response, connectivity and device storage. Large `public/` files can block update downloads; relocate only confirmed problem assets as the app requires. |
| Pending version became active | Verify download completion, pending-version selection and reload. Custom reload code can reload the old bundle if it bypasses the native switch. |
| New client started | Capture the first startup failure or rollback on the device. A version notification or download alone does not prove successful startup. |
An iOS-only production failure can be a cached manifest even when development
and Android update correctly. A [Meteor 3.2.2 reporter confirmed this repair](https://forums.meteor.com/t/cordova-ios-hot-push-code/63707/6).
Meteor marks its manifest non-cacheable; a proxy must preserve that behavior.
Verify a subsequent deployment changes the public manifest version and reaches
the device. A fresh manifest with a real plugin mismatch still requires the
compatibility decision above. Use `meteor-deployment` for the proxy change.
Use selected version values and stage transitions for diagnostics. Never log
full runtime settings, session credentials or private payloads to inspect HCP.
Collect native logs through Android Studio/Xcode and WebView debugging when
needed; use `meteor-debugging` if the failure still spans unknown layers.
## Reload behavior
Cordova HCP reloads the whole client even for CSS-only changes. Browser CSS
refresh and development HMR are different paths; do not promise state-preserving
CSS HMR in a production native app merely because a browser supports it.
Prefer the built-in reload path. When an app already customizes reloads,
inspect that code against its resolved Meteor/reload/webapp-plugin versions:
the native pending bundle must be selected before a forced page reload. The
docs describe `WebAppLocalServer.switchToPendingVersion` and the retry callback
of `Reload._onMigrate`; these are version-sensitive integration hooks, not a
reason to add custom reloader code to every app. Preserve unsaved-state handling
and remove temporary instrumentation after reproducing the repair.
For local HTTP failures, see
[configuration and plugins](configuration-and-plugins.md). A development-only
network exception is not a production compatibility or TLS repair.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/troubleshooting/hot-code-push.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/autoupdate.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/cordova.md
@@ -1,172 +0,0 @@
# Toolchain and development
## Resolve versions before installation
Read the app release and existing platform declarations. Meteor pins Cordova
platforms independently of its Cordova library version. Use Meteor commands
at the app root; a global `cordova` executable is not the authority for the
Meteor-generated project.
Meteor 3.5.2 uses `cordova-lib@13.0.0`; verify Meteor's bundled Cordova tooling
alongside its platform pins when diagnosing a toolchain mismatch.
| Target | Meteor 3.5.2 baseline | Verification |
|---|---|---|
| Android | `cordova-android@15.1.0`, JDK 17, SDK Platform 36, Build Tools 36.0.0, Android command-line tools; Gradle available for project setup | `java -version`, `gradle --version`, SDK Manager, actual generated Gradle/platform output |
| iOS | `cordova-ios@7.1.1`; macOS with Xcode, command-line tools, accepted Xcode license and CocoaPods | `xcode-select -p`, `xcodebuild -version`, `pod --version`, selected simulator/device and signing team |
On earlier Meteor releases, inspect that release's native platform pins and
the corresponding Cordova requirements. For example, a branch pinned to
Meteor 3.5.1 does not acquire 3.5.2's SDK 36 requirement. Preserve a requested
release constraint. A platform upgrade may also raise minimum device OS
support; JavaScript transpilation cannot reverse that change.
For the 3.5.2 Android baseline, install missing SDK components with SDK Manager
or:
```bash
sdkmanager 'platforms;android-36' 'build-tools;36.0.0'
```
Resolve `JAVA_HOME` and `ANDROID_HOME` to the actual host installations;
`ANDROID_SDK_ROOT`, if set, must agree. Add the required command-line tools,
platform-tools and emulator directories to PATH. Do not copy a macOS SDK path
onto Linux or Windows. Keep the generated project's compatible Gradle wrapper
and Android Gradle Plugin pairing rather than accepting an unrelated IDE
upgrade suggestion.
For iOS, a Linux/Windows build cannot produce the Xcode archive or signed IPA.
Use the project's macOS workstation or runner. Native platform requirements
and current store submission requirements are separate; check Apple's current
requirements when preparing an upload.
## Platform lifecycle
```bash
meteor list-platforms
meteor add-platform android
meteor run android
```
Use `meteor add-platform ios` and `meteor run ios` on macOS. The run targets
`android` and `ios` select an emulator/simulator; `android-device` and
`ios-device` select a physical-device workflow. Ensure the device is visible
and authorized in Android Studio/ADB or Xcode before blaming app startup.
To stop targeting a native platform, use `meteor remove-platform android` or
`meteor remove-platform ios` and review `.meteor/platforms`. Do not remove the
shared application or plugins still needed by another platform. Meteor
regenerates its native project from app-level state; running standalone
`cordova platform add/remove` inside generated output is not a durable
replacement for these declarations.
## Device networking and native IDEs
For the standard Android emulator, `10.0.2.2` reaches the host machine:
```bash
meteor run android --mobile-server=http://10.0.2.2:3000
```
For a physical device, use the development machine's reachable LAN address
and port, for example:
```bash
meteor run android-device --mobile-server=http://192.168.1.4:3000
```
Replace that address with the real endpoint. Verify network reachability,
server bind address/firewall, device authorization, and the URL embedded by the
current native build. A custom `DDP_DEFAULT_CONNECTION_URL` can override the
DDP endpoint independently; inspect it when HTTP and subscriptions disagree.
Do not change `--cordova-server-port` expecting it to repair the backend URL.
For cleartext rejection, use the scoped guidance in
[configuration and plugins](configuration-and-plugins.md).
Open the generated project for device logs and native diagnostics:
| Platform | Default development path |
|---|---|
| Android Studio | `.meteor/local/cordova-build/platforms/android/` |
| Xcode | `.meteor/local/cordova-build/platforms/ios/`; prefer the generated `.xcworkspace` when present |
Resolve custom local state first. Preserve useful IDE evidence, then express
durable native changes in `mobile-config.js` or the app's build overrides.
## WebView JavaScript compatibility
Meteor 3.3.2 introduced modern Cordova output with a legacy opt-out. Earlier
Meteor 3 releases used the legacy default. On 3.3.2+, an app that still needs
legacy JavaScript can merge this setting into its existing `package.json`:
```json
{
"meteor": {
"modern": { "cordova": false }
}
}
```
Preserve the other options' effective values; modern objects enable omitted
options, as detailed below. Test the actual supported WebView and
plugins; this setting neither restores OS support dropped by a native platform
nor creates separate modern/legacy Cordova binaries. Web-only development
architecture exclusions are a separate build concern: verify `web.cordova`
is produced when developing native apps or serving HCP.
Check the effective bundle rather than inferring it from the release alone.
Affected 3.3.2 through 3.5 tools can normalize an absent modern setting to
legacy; Meteor 3.5.1 fixes that defaulting defect. Inspect `METEOR_MODERN` and
`meteor.modern` overrides first. On an affected pinned release, explicitly set
`meteor.modern.cordova` to `true` when the supported WebViews allow modern
output, preserving the other effective settings. Objects inherit enabled
defaults, so `{ "cordova": true }` also enables omitted modern options. For an
affected app with no modern setting and no environment override, preserve its
otherwise disabled options with:
```json
{
"meteor": {
"modern": {
"transpiler": false,
"minifier": false,
"webArchOnly": false,
"watcher": false,
"cordova": true
}
}
}
```
Merge this into the existing `meteor` object. If the app already configures
modern options, preserve their effective values instead of copying those
four `false` values. Preserve a deliberate Cordova legacy requirement.
[Fix and regression coverage](https://github.com/meteor/meteor/pull/14411).
Changing only JavaScript output does not itself require a new native binary.
Verify the installed WebViews support that output and the native compatibility
hash is unchanged before using HCP; a release upgrade can separately change
platform/plugin pins. See [hot code push](hot-code-push.md).
## Version-specific startup failures
Match the first exception and resolved package before selecting a repair.
Inspect `.meteor/versions` and app-local `packages/` overrides; npm dependencies
and the Meteor release label alone do not identify the loaded Atmosphere code.
| Confirmed signature | Fixed package / release | Decision |
|---|---|---|
| Early Meteor 3 Cordova startup fails after adding accounts, with a misleading missing `core-js` error from `url/legacy.js` | `url@1.3.5`, shipped in Meteor 3.1 | Check for a shadowing `packages/url` override before choosing a compatible fixed package/release, then verify account startup. Adding app-level `core-js` or removing accounts does not repair the URLSearchParams integration. [Fix](https://github.com/meteor/meteor/pull/13459) |
| `Map.keys`, `Map.entries` or iteration fails in a modern library only in the Cordova bundle | `ecmascript-runtime-client@0.13.0`, shipped in Meteor 3.4.1 | Check whether legacy polyfills replaced native Map/Set/Symbol. Modern transpilation alone is not this fix. Use the compatible fixed package/release; for a constrained branch, verify an app-local backport against its supported WebViews. Do not edit the global Meteor cache or downgrade unrelated UI libraries. [Meteor 3 confirmation](https://forums.meteor.com/t/solved-vue3-does-not-work-with-cordova/61109/10) |
| Meteor 3.4 Rspack `android-device`/iOS development produces SockJS `Invalid frame header` or proxy errors, including in a desktop browser attached to that native run | Atmosphere `rspack@1.1.0`, shipped in Meteor 3.4.1 | Use the fixed native integration that skips the desktop HMR bootstrap/proxy. Confirm the native run-mode reproduction and resolved package; healthy fixed versions or production proxy failures need separate diagnosis. [Fix](https://github.com/meteor/meteor/pull/14226) |
On earlier constrained releases, verify package compatibility before a
selective update or backport. Retest both the native client and any affected
browser clients. Do not force a framework upgrade contrary to the app's
release constraint or apply these repairs to an unexplained white screen.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/cordova.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/index.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/environment-variables.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.3.2.md
-153
View File
@@ -1,153 +0,0 @@
---
name: meteor-pubsub
description: >
Use when authoring or debugging Meteor publications and subscriptions
(Meteor.publish, Meteor.subscribe). Triggers on publication strategies
(SERVER_MERGE, NO_MERGE, NO_MERGE_NO_HISTORY), the low-level publish API
(added/changed/removed), cursor authorization, reactive joins, leaked
documents. Use this skill when the user asks about pub/sub or asks about
reactive data fetching.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: data
tagline: "Author and debug publications/subscriptions (publish strategies, low-level `added/changed/removed`, authorization, reactive joins)."
bundle: ["essentials", "fullstack"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Meteor publications and subscriptions
Publications stream a set of documents to subscribed clients and keep them
live. The publication is the only place server-side authorization can
filter rows before they reach the client.
## Decision flow
1. Does the client need this data reactively? If no, prefer a method (one-shot
read). If yes, use a publication.
2. Is the data user-specific? Filter by `this.userId` inside the publish
function. Without that filter, documents leak across users.
3. Can the publication be expressed as a single cursor? Return it directly.
4. Does it need one async lookup before choosing a cursor? Use an async
publish handler, await the lookup, then return the cursor.
5. Does it need per-document async joins, custom aggregation output, or an
external reactive source? Drop to the low-level `this.added` /
`this.changed` / `this.removed` API.
## Scaffold
```javascript
import { Meteor } from "meteor/meteor";
import { Items } from "/imports/api/items";
Meteor.publish("items.mine", function () {
if (!this.userId) {
return this.ready();
}
return Items.find(
{ ownerId: this.userId },
{ fields: { title: 1, qty: 1, updatedAt: 1 }, sort: { updatedAt: -1 } },
);
});
```
Project `fields` whenever the collection contains columns the subscriber
must not receive.
Async publish handlers may also return a cursor:
```javascript
Meteor.publish("items.byTeam", async function (teamId) {
const member = await Memberships.findOneAsync({
teamId,
userId: this.userId,
});
if (!member) return this.ready();
return Items.find({ teamId }, { fields: { title: 1, qty: 1 } });
});
```
Meteor awaits the handler before processing the returned cursor.
## Subscribing
```javascript
import { Meteor } from "meteor/meteor";
const handle = Meteor.subscribe("items.mine");
// React / Blaze / Svelte hooks observe handle.ready() and the local cursor.
handle.stop();
```
## Publication strategies
Set per-collection with `Meteor.server.setPublicationStrategy`. Three options:
```javascript
import { DDPServer } from "meteor/ddp-server";
Meteor.server.setPublicationStrategy(
"items",
DDPServer.publicationStrategies.NO_MERGE,
);
```
| Strategy | When to use |
|----------------------|-----------------------------------------------------------------------------|
| `SERVER_MERGE` | Default. Tracks merged document fields across publications and sends deltas. |
| `NO_MERGE` | Tracks sent document IDs so unsubscribe can remove them. Use when the collection is owned by one publication. |
| `NO_MERGE_NO_HISTORY`| Remembers nothing and sends no removals on stop. Reserve for send-and-forget queues where stale client documents are intentional. |
See `references/publication-strategies.md`.
## Low-level publish API
For joins or async work:
```javascript
Meteor.publish("feed", async function () {
const cursor = Posts.find({}, { fields: { title: 1, authorId: 1 } });
const observer = await cursor.observeChangesAsync({
added: async (id, doc) => {
const author = await Users.findOneAsync(doc.authorId, {
fields: { username: 1 },
});
this.added("feed", id, { ...doc, authorName: author?.username });
},
changed: (id, changes) => this.changed("feed", id, changes),
removed: (id) => this.removed("feed", id),
});
this.ready();
this.onStop(() => observer.stop());
});
```
Note: cursor `transform` functions remain synchronous. Use a separate
publication or the low-level API for per-document async joins.
Live observer delivery does not wait for one async callback before later
changes arrive. If ordering or backpressure matters, serialize the work with a
per-subscription Promise queue. Attach an error policy and stop the observer
from `this.onStop`; see `references/low-level-publish-api.md`.
## Anti-patterns
- Publish without a `this.userId` filter when data is user-specific.
- Publish sensitive or unnecessary columns. Add a `fields` projection when
the full document is not part of the publication contract.
- Confuse an async publish handler with an async cursor transform. Meteor
awaits the handler Promise, but each transform callback must return a
document synchronously.
- Use cursor transforms for async joins. Transforms are synchronous; the
low-level API is the right tool.
- Subscribe to large unbounded collections. Page the data with `limit`/`skip`.
## See also
- `references/publication-strategies.md`
- `references/low-level-publish-api.md`
- `references/eval-cases.md`
@@ -1,93 +0,0 @@
# Evaluation cases for `meteor-pubsub`
## Case 1: missing auth filter
Prompt: "Why are documents from other users showing up in my client when I
subscribe to this publication?"
```javascript
Meteor.publish("items", function () {
return Items.find({});
});
```
Pass if the agent adds `this.userId` filtering and an `ownerId` selector.
## Case 2: async join
Prompt: "I want my feed publication to include the author username. The
cursor transform crashed with 'returned a Promise'."
Pass if the agent rewrites to the low-level publish API with
`observeChangesAsync`.
## Case 3: strategy choice
Prompt: "My server runs out of memory under load. I publish a real-time
activity feed to every user."
Pass if the agent chooses `NO_MERGE` only when the collection is owned by one
publication and explains that it tracks sent IDs for removals on unsubscribe.
It may choose `NO_MERGE_NO_HISTORY` only for a send-and-forget queue whose
consumer owns cleanup, and must warn that no removals are sent on stop. Fail if
it calls either strategy stateless without qualification.
## Case 4: unsubscribe
Prompt: "How do I stop the subscription when the user leaves the page?"
Pass if the agent stores the handle and calls `.stop()` in unmount/cleanup.
## Case 5: async handler returning a cursor
Prompt: "My publication awaits a membership lookup and then returns
`Items.find({ teamId })`. Does an async `Meteor.publish` handler require the
low-level API?"
Pass if the agent says Meteor awaits async publish handlers and accepts the
returned cursor. Fail if it rejects the handler only because it returns a
Promise. It may recommend the low-level API only for custom or per-document
async output.
## Case 6: ordered async join
Prompt: "My `observeChangesAsync` `added` callback awaits a user lookup. Under
bursty updates, later changes overtake earlier joins and rejected lookups only
appear in logs."
Pass if the agent explains that live delivery does not await each callback,
serializes dependent work with a per-subscription Promise queue, registers
observer teardown with `this.onStop`, and defines a terminal error policy such
as `this.error`. Fail if it assumes `async added()` alone provides
backpressure.
## Case 7: publication error lifecycle
Prompt: "Can I call `this.error(err)` to report a warning and keep the
subscription alive?"
Pass if the agent says `this.error` stops the subscription and sends the error
to the client. It should recommend a separate data or logging channel for a
non-fatal warning.
## Case 8: optimistic resubscribe in beta.1
Prompt: "With NO_MERGE_NO_HISTORY and a pending optimistic method write, resubscribing sends another added for the same document. What changes with ddp-client 3.4.2-beta360.1, and who clears documents on unsubscribe?"
Pass if the agent: Describes merging server fields into the saved snapshot while stub values remain visible until writes settle. Retains application-owned cleanup; does not claim new history or removals on unsubscribe. Scopes cleanup to owned data instead of clearing a shared collection or prescribing private collection handles as a generic fix.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 9: earlier optimistic duplicate add
Prompt: "Our Meteor 3.5.2 client throws Server sent add for existing id only while a stub write is outstanding during resubscribe. Is duplicate-added tolerance already guaranteed on this version?"
Pass if the agent: Checks client package and pending-write path, identifies the beta.1 fix boundary, and recommends a compatible tested upgrade or app-level sequencing. Does not claim all older clients support that path or switch publication strategies without considering ownership/cleanup.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 10: Fieldless retained document
Prompt: "On beta.1, after stopping a NO_MERGE_NO_HISTORY subscription, an ID-only resubscription throws Cannot convert undefined or null to object. DDP added has no fields. Is this the pending-stub fix, and what should beta.3 preserve?"
Pass if the agent distinguishes mongo fieldless replication from ddp-client pending-stub fix; beta.3 missing fields are a no-op preserving retained values, wire cleared removes fields while null sets a value, and later updates are tested.
Fail if it deletes retained fields for absent fields, publishes dummy fields, clears a shared collection, confuses null with removal, or promises unsubscribe removals.
@@ -1,73 +0,0 @@
# Low-level publish API
When a publish function needs to join, transform asynchronously, or react to
external sources, return nothing and drive the publication imperatively.
## Methods on `this`
- `this.added(collectionName, id, fields)`: announce a document.
- `this.changed(collectionName, id, fields)`: update fields.
- `this.removed(collectionName, id)`: drop a document.
- `this.ready()`: signal initial population complete.
- `this.onStop(fn)`: register a teardown.
- `this.error(err)`: stop the subscription and send the error to the client.
- `this.stop()`: end the subscription.
- `this.userId`, `this.connection`: identity.
## Pattern
```javascript
Meteor.publish("feed", async function () {
const handle = await Posts.find().observeChangesAsync({
added: (id, doc) => this.added("posts", id, doc),
changed: (id, doc) => this.changed("posts", id, doc),
removed: (id) => this.removed("posts", id),
});
this.ready();
this.onStop(() => handle.stop());
});
```
Always pair `observeChangesAsync` with `onStop`. Leaks otherwise.
## Async callback ordering
Initial `added` callbacks can be awaited while the observer is attaching, but
live notifications do not wait for an async callback before scheduling later
changes. Returning a Promise gives Meteor a rejection to log; it does not add
live-event backpressure. Serialize dependent work yourself:
```javascript
Meteor.publish("feed", async function () {
let work = Promise.resolve();
const enqueue = (task) => {
work = work.then(task).catch((error) => this.error(error));
return work;
};
const handle = await Posts.find().observeChangesAsync({
added: (id, doc) => enqueue(async () => {
const author = await Users.findOneAsync(doc.authorId, {
fields: { username: 1 },
});
this.added("feed", id, { ...doc, authorName: author?.username });
}),
changed: (id, fields) => enqueue(async () => {
this.changed("feed", id, fields);
}),
removed: (id) => enqueue(async () => {
this.removed("feed", id);
}),
});
this.ready();
this.onStop(() => handle.stop());
});
```
Keep independent callbacks synchronous when no asynchronous join is needed.
If one queued task fails, `this.error` terminates the subscription instead of
leaving the client with partially joined data.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/meteor.md#publish-and-subscribe
@@ -1,76 +0,0 @@
# Publication strategies
## `SERVER_MERGE` (default)
The server maintains a per-client view of every published document and only
sends diffs. Highest memory cost; lowest bandwidth. Right for typical apps
where the working set per client is small.
## `NO_MERGE`
The server does not merge fields across publications, but it remembers the
document IDs sent by this subscription. It can therefore send removals when
the subscription stops. Client handling is forgiving: duplicate `added`
messages become changes, a `changed` for an unknown ID becomes an add, and a
`removed` for an unknown ID is ignored.
There is an earlier-client exception while an optimistic method write is
pending. Meteor 3.6-beta.1's `ddp-client@3.4.2-beta360.1` handles a repeated
`added` by merging server fields into the saved server snapshot; the stub's
visible value remains until outstanding writes settle. Earlier clients can
throw `Server sent add for existing id` in this path. Inspect the client's
resolved version and reproduce with a pending write before relying on the fix.
It also covers resubscribing under `NO_MERGE_NO_HISTORY`; it does not add
server history, ownership merging or unsubscribe removals to that strategy.
A separate fix is verified in Meteor 3.6-beta.3's
`mongo@2.5.2-beta360.3`: DDP can omit empty `fields`, including an ID-only
publication's repeated `added` after a retained full document. The resulting
fieldless change is a no-op, preserving existing fields, and later updates
continue. Earlier packages can throw `Cannot convert undefined or null to
object` in this path even with beta.1's pending-stub fix. Capture the wire
message and loaded client packages before selecting the fix. Explicit field
clears still remove fields: the wire uses `cleared: ["fieldName"]`, which
parses into `fields: { fieldName: undefined }`. `fields: { fieldName: null }`
sets a null value; it does not remove the field. Missing `fields` is not an
instruction to erase the document. Do not add dummy published fields or clear
a shared collection to hide the crash.
Use this when a collection is supplied by only one publication. It uses less
server state than `SERVER_MERGE`, but multiple publications for the same
collection can overwrite each other's document view.
## `NO_MERGE_NO_HISTORY`
The server remembers nothing about sent documents and does not send removals
when the subscription stops. Use only for special send-and-forget queues where
the consumer handles retention and stale client documents are intentional.
Scope consumer cleanup to documents it owns. Do not clear an entire shared
Minimongo collection or use private collection handles as a generic repair;
pending optimistic writes and other active subscriptions may still own data.
## Setting the strategy
Strategies are set per collection name, not per publication.
```javascript
import { DDPServer } from "meteor/ddp-server";
Meteor.server.setPublicationStrategy(
"feed",
DDPServer.publicationStrategies.NO_MERGE,
);
// Read it back
Meteor.server.getPublicationStrategy("feed");
```
## Choosing
- Default app (collaborative editor, dashboards): `SERVER_MERGE`.
- Collection owned by one publication, with unsubscribe cleanup: `NO_MERGE`.
- Send-and-forget queue with application-owned cleanup: `NO_MERGE_NO_HISTORY`.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/api/meteor.md#publication-strategies
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
-212
View File
@@ -1,212 +0,0 @@
---
name: meteor-react
description: >
Use when building or debugging React interfaces in Meteor 3: meteor create
--react, createRoot, JSX or TSX entry points, Rspack React detection, Fast
Refresh, react-meteor-data, useTracker, useSubscribe, useFind, withTracker,
Suspense, and Tracker.withComputation. Triggers on isLoading being treated as
a boolean, useFind receiving fetch(), stale closure inputs, duplicate tracker
side effects, unstable Suspense keys, lost reactivity after await, state reset
after refresh, or React tests leaking computations. Use this skill when the
user asks about a React skeleton, React Compiler, React-specific rspack.config rules, reactive
data hooks, or classic versus Suspense integration. Route general bundler
configuration to meteor-modern-build-stack and Meteor 2 upgrades to
migrate-to-meteor-3.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: data
tagline: "Build and debug Meteor 3 React interfaces (Rspack scaffold, reactive data hooks, Suspense, Fast Refresh, and testing)."
bundle: ["react"]
docs_synced_at: "2026-09-23"
license: MIT
---
# React interfaces for Meteor 3
React owns rendering and local UI state; Meteor owns reactive data and the
build handoff. Components consume authorized data and invoke methods.
Publications and methods remain the server authority.
## Decision flow
1. For a new JavaScript app, run `meteor create --react <name>`; React is also
the default skeleton. For TypeScript and TSX, run
`meteor create --typescript <name>`.
2. Inspect `package.json`, `.meteor/packages`, `.meteor/versions`, the client
entry, and `rspack.config.*`. Skeletons and `react-meteor-data` versions can
change independently of this skill.
3. Mount one React root from `Meteor.startup` with `createRoot`.
4. Pick one `react-meteor-data` surface for a component:
- Classic hooks for explicit loading UI and synchronous Minimongo reads.
- Suspense hooks only when an upstream Suspense fallback and rejection
boundary already own the pending and error states.
5. Use `useSubscribe` for readiness, `useFind` for reactive lists with stable
document references, and `useTracker` for other Tracker values.
6. Keep React-specific Rspack rules here. Route aliases, loaders, code
splitting, cache, output, or migration work to the build skills.
7. Test UI behavior in a browser-backed client suite and always unmount the
rendered root so Tracker computations and subscriptions can stop.
## Current scaffold
```bash
meteor create --react my-app
cd my-app
meteor
```
Current Meteor 3.4+ scaffolds use Rspack and `react-meteor-data`. Inspect
`.meteor/versions`: Meteor 3 requires 3.0.0+, these examples target 4.0.1, and
`references/react-meteor-data.md` records feature floors.
```jsx
import { Meteor } from "meteor/meteor";
import { createRoot } from "react-dom/client";
import { App } from "/imports/ui/App";
import "/imports/ui/styles.css";
Meteor.startup(() => {
const container = document.getElementById("react-target");
if (!container) throw new Error("Missing #react-target");
createRoot(container).render(<App />);
});
```
TypeScript uses `client/main.tsx`, a `tsconfig.json`, and usually
`rspack.config.ts`. Meteor discovers that TypeScript config directly.
## Reactive data selection
| Need | API | Contract |
|------|-----|----------|
| Subscription readiness | Classic `useSubscribe` | Returns an `isLoading` function. Call it. |
| Reactive list | Classic `useFind` | Return a cursor, never `fetch()`. |
| User, count, single document, ReactiveVar | Classic `useTracker` | Return the reactive value. Avoid arbitrary side effects. |
| Async value with Suspense | Suspense `useTracker` | Supply a stable key and Promise-producing function. |
| SSR-capable collection query | Suspense `useFind` | Pass the collection and the `find` argument tuple. |
| Existing class component | `withTracker` | Keep it during focused maintenance; plan hooks separately. |
Classic list scaffold:
```jsx
import { useFind, useSubscribe } from "meteor/react-meteor-data";
import { Tasks } from "/imports/api/tasks";
export function TaskList({ listId }) {
const isLoading = useSubscribe("tasks.byList", listId);
const tasks = useFind(
() => Tasks.find({ listId }, { sort: { createdAt: -1 } }),
[listId],
);
if (isLoading()) return <p>Loading...</p>;
if (tasks.length === 0) return <p>No tasks.</p>;
return <ul>{tasks.map((task) => <li key={task._id}>{task.title}</li>)}</ul>;
}
```
`useFind` owns cursor observation and updates only changed document references.
Use `useTracker` when a transformed aggregate is clearer. Read
`references/react-meteor-data.md` before tuning dependencies or `skipUpdate`.
## Suspense and async reactivity
Suspense imports change signatures; they are not drop-in replacements:
```jsx
import { Suspense } from "react";
import { useFind, useSubscribe } from "meteor/react-meteor-data/suspense";
import { Tasks } from "/imports/api/tasks";
function TaskList({ listId }) {
useSubscribe("tasks.byList", listId);
const tasks = useFind(Tasks, [
{ listId },
{ sort: { createdAt: -1 } },
], [listId]);
return <ul>{tasks.map((task) => <li key={task._id}>{task.title}</li>)}</ul>;
}
export function TaskScreen({ listId }) {
return (
<AppErrorBoundary>
<Suspense fallback={<p>Loading...</p>}>
<TaskList listId={listId} />
</Suspense>
</AppErrorBoundary>
);
}
```
Treat Suspense `useSubscribe` as a suspension-only call. In the currently
audited package, its declared return type and runtime value disagree, so do not
consume the return. Read `references/suspense-and-async.md` for stable keys,
rejections, SSR, and `Tracker.withComputation` after `await`.
## Build and refresh ownership
Rspack detects React from the app's npm dependencies, enables JSX or TSX SWC
parsing, and installs and injects React Refresh for client development. A
normal React Rspack app does not add the refresh plugin manually.
Keep `rspack.config.*` minimal. The generated JavaScript skeleton demonstrates
an optional SVGR rule; the TypeScript skeleton demonstrates type checking.
Compose custom rules through `defineConfig` from `@meteorjs/rspack` without
replacing Meteor's SWC defaults.
For React Compiler, the Meteor 3.6-beta.0 pairing supports SWC; older pairings
can retain Babel. Read [compiler setup](references/build-refresh-and-testing.md#react-compiler)
for React-version targets and runtime requirements.
| Request | Owner |
|---------|-------|
| React detection, JSX or TSX, React Refresh boundary | This skill |
| General `rspack.config` helpers, SWC, aliases, cache, chunks | `meteor-modern-build-stack` |
| Convert an existing app or legacy build plugin to Rspack | `migrate-to-rspack` |
| Meteor-bundler HMR or custom `module.hot` lifecycle | Build skill, then this skill for React symptoms |
If edits reload the page or reset component state, first determine which
bundler compiled the module. In a Rspack client graph, inspect React Refresh
boundaries and avoid a second `react-fast-refresh` stack. In a Meteor-bundler
graph, verify `hot-module-replacement` and the bundled React Fast Refresh
integration. See `references/build-refresh-and-testing.md`.
## Mutations and tests
Call `Meteor.callAsync` from event handlers, model pending and rejection in
React state, and leave validation and authorization inside the method. Do not
write sensitive collections directly from a component.
For tests, separate a presentational component that accepts data as props from
the hook-owning container. Unit-test the former with the project's existing
React test library. Test the latter in a browser client with controlled
Minimongo or a real publication. Assert rendered behavior, not the number of
reactive-function calls, because React can discard work and invoke initial
render logic more than once.
## Anti-patterns
- Treat classic `isLoading` as a boolean. It is a function and must be called.
- Pass `Tasks.find().fetch()` to `useFind`. Return the cursor.
- Put a subscription inside a `useFind` factory. Subscribe separately.
- Call React state setters, methods, analytics, or arbitrary effects inside a
`useTracker` reactive function.
- Force every classic component onto Suspense. Both surfaces remain useful.
- Reuse a generic Suspense key for unrelated mounted computations.
- Read a Tracker source only after `await` without restoring the computation.
- Add `@rspack/plugin-react-refresh` to project config when Meteor already
injected it.
- Replace all Rspack SWC options to add one React transform. Extend them.
- Mock away all Meteor data behavior in a component integration test.
## Authoritative resources
- [Meteor React tutorial](https://docs.meteor.com/tutorials/react/)
- [`react-meteor-data` documentation](https://docs.meteor.com/packages/react-meteor-data.html)
- [`meteor/react-packages` source and changelog](https://github.com/meteor/react-packages/tree/master/packages/react-meteor-data)
- [Meteor Rspack integration](https://docs.meteor.com/about/modern-build-stack/rspack-bundler-integration.html)
- [React `createRoot`](https://react.dev/reference/react-dom/client/createRoot)
- [React Suspense](https://react.dev/reference/react/Suspense)
- `references/eval-cases.md`
@@ -1,188 +0,0 @@
# React build, refresh, and testing
## Generated application contract
Create from the selected Meteor release, then inspect the result:
```bash
meteor create --react my-app
meteor create --typescript my-ts-app
```
Current JavaScript React skeletons use:
```text
client/main.jsx
server/main.js
tests/main.js
rspack.config.js
```
Current TypeScript skeletons use `.tsx` and `.ts` entries, a
`rspack.config.ts`, `swc.config.ts`, `tsconfig.json`, Meteor package types, and
a Rspack type-checking plugin. Both skeletons declare `meteor.mainModule`,
`meteor.testModule`, and `meteor.modern` in `package.json`.
Do not paste dependency versions from documentation into an older app. Match
`@meteorjs/rspack` to the Meteor release, run `meteor update --npm`, and commit
the resulting `package.json` and lockfile changes.
## React-specific Rspack behavior
The Meteor Rspack package currently recognizes React when `react` exists in
the app's npm dependencies and `preact` does not. It then:
- enables JSX for JavaScript entries or TSX for TypeScript entries;
- configures the SWC React transform;
- keeps `react` and `react-dom` external to the Rspack app bundle;
- ensures `@rspack/plugin-react-refresh` and `react-refresh` are installed;
- injects the refresh plugin only for client development runs.
The generated JavaScript config adds only an SVGR rule:
```javascript
const { defineConfig } = require("@meteorjs/rspack");
module.exports = defineConfig(() => ({
module: {
rules: [{
test: /\.svg$/i,
issuer: /\.[jt]sx?$/,
use: ["@svgr/webpack"],
}],
},
}));
```
Keep this project layer limited to real application needs. Use
`Meteor.extendConfig` for composable Rspack fragments and
`Meteor.extendSwcConfig` for a narrow SWC change. Do not use
`Meteor.replaceSwcConfig` just to add a React transform; replacement discards
Meteor's parser, helper, and refresh defaults unless reconstructed exactly.
## React Compiler
Meteor 3.6-beta.0 pairs Atmosphere `rspack@1.4.0-beta360.0` with npm
`@meteorjs/rspack@3.0.0-beta.1` and Rspack 2.2.0. Beta.1 pairs
`rspack@1.4.0-beta360.1` with `@meteorjs/rspack@3.0.0-beta.2` and retains
that Rspack minimum. Both pairings support the
SWC React Compiler path introduced upstream in Rspack 2.1. Inspect the resolved
packages and React major before selecting it. Earlier Meteor/Rspack pairings
can keep `babel-plugin-react-compiler` with `babel-loader`; do not copy the
new SWC option into an older compiler.
For React 19:
```javascript
const { defineConfig } = require("@meteorjs/rspack");
module.exports = defineConfig((Meteor) => ({
...Meteor.extendSwcConfig({
jsc: {
transform: {
react: { runtime: "automatic" },
reactCompiler: true,
},
},
}),
}));
```
For React 17 or 18, install `react-compiler-runtime` with the project's package
manager and use `reactCompiler: { target: "17" }` or `{ target: "18" }`.
Do not upgrade an existing app to React 19 merely because a new scaffold uses
it. Preserve Meteor's parser, helpers, and refresh defaults through
`extendSwcConfig`. Do not compile the same modules with both compiler paths.
Before removing Babel, inventory its remaining plugins and verify that the
SWC compiler supports the options the app needs. Compare component behavior,
production output, and development refresh. Keep a narrow Babel path when
required options or other transforms have no verified replacement.
## Two HMR graphs
Rspack compiles application modules. Meteor still compiles Atmosphere packages
and any modules deliberately delegated with `Meteor.compileWithMeteor`.
| Module owner | Refresh mechanism |
|--------------|-------------------|
| Rspack client graph | Rspack HMR plus `@rspack/plugin-react-refresh` |
| Meteor bundler graph | `hot-module-replacement` plus Meteor's React Fast Refresh integration |
Current Rspack React skeletons include `hot-module-replacement` for the second
graph. That does not require manually adding `react-fast-refresh` to the Rspack
graph. Identify the module owner before changing packages.
Fast Refresh can preserve local component state only when the edited module
remains a valid refresh boundary. If state resets or a full reload occurs:
1. Inspect the first client console or build error.
2. Confirm whether Rspack or Meteor compiled the edited module.
3. Keep component modules focused. Move unrelated mutable singletons, Tracker
computations, and side-effectful registration into lifecycle-owned modules.
4. Verify component export shape and hook order did not change.
5. Remove duplicate refresh plugins or manual `module.hot.accept()` code added
without a specific non-React resource owner.
Never use refresh as resource cleanup. Stop timers, observers, global event
listeners, and manually created computations through React effects or the
owning module's explicit HMR disposal.
## React-specific test shape
Use `meteor-testing` for runner and browser-driver setup. This reference only
owns React integration behavior.
Split components when possible:
```jsx
export function TaskListView({ loading, tasks }) {
if (loading) return <p>Loading...</p>;
return <ul>{tasks.map((task) => <li key={task._id}>{task.title}</li>)}</ul>;
}
export function TaskListContainer({ listId }) {
const isLoading = useSubscribe("tasks.byList", listId);
const tasks = useFind(() => Tasks.find({ listId }), [listId]);
return <TaskListView loading={isLoading()} tasks={tasks} />;
}
```
Test `TaskListView` with the React test library already selected by the
project. Test `TaskListContainer` in a browser client where Tracker and
Minimongo exist. Use controlled Minimongo documents for a hook-focused test or
a real authorized publication for an integration test.
Every test that mounts a root or rendered component must unmount it in cleanup.
Flush React updates using the `act` API compatible with the project's installed
React version. Do not hardcode an import copied from a different React major.
Assert user-visible state:
- loading before subscription readiness;
- empty after ready with zero documents;
- rows update when Minimongo changes;
- rejected method or Suspense Promise reaches error UI;
- unmount stops owned work and prevents later state updates.
Do not assert that a reactive function or effect ran exactly once. Strict Mode
and concurrent rendering can replay or discard initial work. Test the committed
DOM and resource cleanup instead.
## Test-mode build checks
The client test entry is a separate Rspack graph. A green server-only run does
not prove JSX or TSX client compilation. In CI:
1. Configure a browser driver.
2. Confirm expected client suites and assertions ran.
3. Exercise the real `meteor.testModule` entry.
4. Retain a production browser smoke for build-only differences.
Generated Rspack directories can enter typecheck, lint, or test discovery after
the first build. Exclude the active `_build`, `public/build-assets`,
`public/build-chunks`, and `private/build-assets` paths in each tool's native
configuration, not in `.meteorignore`.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
@@ -1,205 +0,0 @@
# Evaluation cases for `meteor-react`
## Case 1: create a current JavaScript React app
Prompt: "Create the baseline for a new Meteor 3 React app."
Pass if the agent uses `meteor create --react`, inspects the generated client,
server, test, package, and Rspack files for the selected release, and mounts one
root with `createRoot` inside `Meteor.startup`. Fail if it reconstructs an old
skeleton from memory without inspecting generated state.
## Case 2: create a TypeScript React app
Prompt: "I want Meteor, React, TypeScript, and Rspack from the start."
Pass if the agent uses `meteor create --typescript`, preserves `.tsx` and `.ts`
entry points plus `rspack.config.ts`, and inspects generated type and SWC config.
Fail if it creates JavaScript first and renames files without updating entries.
## Case 3: loading never finishes
Prompt: "`const loading = useSubscribe('tasks')`; `if (loading)` always shows
my spinner."
Pass if the agent calls `loading()`, explains that classic `useSubscribe`
returns a function, and keeps the classic import. Bonus if it notes that the
call opts into readiness reactivity.
## Case 4: `useFind` warns about a cursor
Prompt: "Why does `useFind(() => Tasks.find().fetch())` warn and rerender every
row?"
Pass if the agent returns the cursor without `.fetch()`, keeps subscription
ownership in `useSubscribe`, and explains stable unchanged document references.
## Case 5: list prop changes but query does not
Prompt: "My `useFind` list stays on the previous `listId`."
Pass if the agent includes `listId` in the cursor factory and dependency array.
Fail if it adds a changing subscription inside the cursor factory.
## Case 6: side effect fires twice
Prompt: "An analytics call inside `useTracker` fires twice in development. Is
Tracker broken?"
Pass if the agent removes arbitrary side effects from the reactive function,
models them in a commit-owned React effect if needed, and explains that React
can discard or replay initial render work. Fail if it suppresses the duplicate
with a global flag.
## Case 7: measured `useTracker` optimization
Prompt: "A complex Minimongo aggregate is expensive. How should I retain its
computation and skip irrelevant updates?"
Pass if the agent first includes captured inputs in `deps`, measures the
render, and uses a narrow `skipUpdate` comparator where true means skip. Fail if
it deep-compares the entire result by default.
## Case 8: keep a class component
Prompt: "A stable class component uses `withTracker`. Must I rewrite it before
upgrading `react-meteor-data`?"
Pass if the agent verifies the installed package, notes current v4's
development deprecation warning, and allows a focused later hooks migration.
Fail if it rewrites the component during unrelated work without behavior tests.
## Case 9: adopt Suspense safely
Prompt: "Switch this task list from classic hooks to Suspense."
Pass if the agent changes the import and signatures, adds a Suspense fallback
and error boundary, treats `useSubscribe` as a statement, supplies a stable
tracker key where needed, and uses the collection plus find-argument tuple for
Suspense `useFind`.
## Case 10: consume a Suspense subscription handle
Prompt: "TypeScript says Suspense `useSubscribe` returns a handle, so I call
`.stop()` on it. Runtime returns null."
Pass if the agent identifies the current declaration/runtime mismatch, stops
consuming the return, and verifies the exact installed package version. Fail if
it type-casts the null value to a handle.
## Case 11: reactive read after `await`
Prompt: "My Suspense `useTracker` calls a method, then `fetchAsync`, but it
never reruns when Minimongo changes."
Pass if the agent accepts the computation argument and wraps the reactive read
after `await` in `Tracker.withComputation(computation, ...)`. Fail if it wraps
only the earlier nonreactive method call.
## Case 12: duplicate React Refresh plugin
Prompt: "My Rspack config manually adds `@rspack/plugin-react-refresh`, and
updates now run twice."
Pass if the agent confirms React detection and removes the manual duplicate
from the Rspack graph while retaining Meteor's generated dependencies. It
should distinguish `hot-module-replacement` for Meteor-owned modules.
## Case 13: state resets on every edit
Prompt: "Rspack rebuilds quickly, but editing this React component resets its
state."
Pass if the agent identifies the compiling graph, checks the first console
error and refresh-boundary export shape, separates unrelated side effects, and
does not promise state preservation for every edit.
## Case 14: React-specific Rspack rule
Prompt: "Add SVG imports as React components to the generated Meteor React
app."
Pass if the agent extends the generated `defineConfig` with an SVGR rule scoped
to JSX or TSX issuers and preserves Meteor's defaults. Route general aliases,
chunking, or output configuration to `meteor-modern-build-stack`.
## Case 15: component integration test
Prompt: "Test a React task list that uses `useSubscribe` and `useFind`."
Pass if the agent separates presentational and hook-owning coverage, runs the
integration in a browser client with Tracker and Minimongo or a real
publication, unmounts the component, and asserts DOM state instead of exact
reactive-function call counts.
## Case 16: server tests only
Prompt: "My React-only Rspack change passes six server tests, but the runner
says browser client tests were not run. Is that enough?"
Pass if the agent requires a browser driver, verifies client suite counts and
the test entry graph, and retains a production browser smoke.
## Case 17: publication authorization
Prompt: "Can I hide other users' tasks by filtering them only inside
`useFind`?"
Pass if the agent says no, routes authorization and field projection to
`meteor-pubsub`, and treats the component query only as a local view.
## Case 18: Meteor 2 React migration
Prompt: "Upgrade this React app from Meteor 2 and convert all data hooks."
Pass if the agent routes the framework upgrade to `migrate-to-meteor-3`, then
uses this skill for the chosen React target. Fail if it forces Suspense as a
Meteor 3 requirement.
## Case 19: Preact project
Prompt: "Meteor's Rspack integration detected Preact. Should I add React
Refresh packages manually?"
Pass if the agent does not apply the React bundle blindly, notes that Meteor
skips React-specific dependencies when Preact is present, and routes general
Preact build work to `meteor-modern-build-stack`.
## Case 20: raw HTML
Prompt: "Render this user-provided HTML with `dangerouslySetInnerHTML`."
Pass if the agent routes sanitization and CSP review to `meteor-security` and
does not treat React escaping as protection after opting into raw HTML.
## Case 21: Suspense on an older package line
Prompt: "This Meteor 3 app pins `react-meteor-data@2.6.3`. Add the Suspense
`useFind` import from the current docs without changing dependencies."
Pass if the agent inspects `.meteor/versions`, says the Suspense entry point
begins in 2.7.0 and official Meteor 3 compatibility begins in 3.0.0, and
requires an upgrade before using the current API. It should prefer a tested
3.0.0+ version, with current examples verified against 4.0.1. Fail if it
assumes the Meteor 3 release supplies every package feature.
## Case 22: React 19 SWC compiler
Prompt: "Our Meteor 3.6-beta.0 app has the paired Rspack packages and React 19. Enable React Compiler without a second Babel pass."
Pass if the agent: Uses extendSwcConfig and jsc.transform.reactCompiler true with automatic React runtime, preserves Meteor defaults, and verifies production/component/refresh behavior without adding duplicate transforms.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 23: React 18 compiler target
Prompt: "We upgraded the build to Meteor 3.6-beta.0 but must retain React 18. Can SWC React Compiler work without a React major upgrade?"
Pass if the agent: Keeps React 18, selects target 18 and react-compiler-runtime, verifies installed dependencies, and does not force React 19 or copy the React 19 boolean setting alone.
Fail if it contradicts these boundaries or invents unsupported commands.
## Case 24: older compiler near miss
Prompt: "This app stays on Meteor 3.5.2 with its paired Rspack packages and Babel React Compiler. Can we simply delete Babel and set jsc.transform.reactCompiler true?"
Pass if the agent: Rejects assuming the new SWC path exists in the old pairing, retains the required Babel transform or requests a scoped paired upgrade, and inventories other Babel plugins.
Fail if it contradicts these boundaries or invents unsupported commands.
@@ -1,178 +0,0 @@
# Classic `react-meteor-data`
Use the classic import when the component owns explicit loading UI or needs
synchronous Tracker and Minimongo values:
```javascript
import {
useFind,
useSubscribe,
useTracker,
withTracker,
} from "meteor/react-meteor-data";
```
`react-meteor-data` versions move independently from Meteor core releases.
Inspect `.meteor/versions` before relying on a signature or bug fix. The
official `meteor/react-packages` master revision audited on 2026-08-25 was
`a2dbe228957fc4225b76e9206386861b49b1527b`, package version 4.0.1.
Use these package floors to diagnose existing apps, not to recommend old
package lines for a Meteor 3 app:
| Capability | First `react-meteor-data` version | Meteor 3 guidance |
|---|---|---|
| `useTracker` | 2.0.0 | Use 3.0.0+; current examples target 4.0.1. |
| `useSubscribe` and `useFind` | 2.4.0 | Use 3.0.0+ and verify the installed signature. |
| Suspense hook entry point | 2.7.0 | Use 3.0.0+; do not infer it from the Meteor release. |
| Isomorphic Suspense `useFind` | 2.7.2 | Use 3.0.0+ for Meteor 3 compatibility. |
| Official Meteor 3 compatibility | 3.0.0 | Minimum package line for Meteor 3 apps. |
| `useSubscribeSuspenseServer` | 3.0.3 | Require 3.0.3+ only when that server helper is needed. |
The current package may contain later fixes without changing a hook's public
name. Pin the project version, verify its changelog, and test the selected
client and SSR paths before copying a current signature into an older app.
## Hook selection
| Hook | Use it for | Return |
|------|------------|--------|
| `useSubscribe(name, ...args)` | Subscription lifetime and readiness | `() => boolean`, true while loading |
| `useFind(factory, deps?)` | Reactive cursor list with stable unchanged document references | Array, or null when factory returns null |
| `useTracker(reactiveFn, deps?, skipUpdate?)` | Any other Tracker-derived value | Value returned by `reactiveFn` |
| `withTracker(mapper)` | Existing function or class component container | Wrapped component |
## `useSubscribe`
The return value is a function:
```javascript
const isLoading = useSubscribe("tasks.byList", listId);
if (isLoading()) return <Loading />;
```
Calling `isLoading()` both reads readiness and opts the component into the
readiness update. Testing `if (isLoading)` is always truthy and never reads the
subscription state.
Use a falsy name to bypass the subscription without conditionally calling a
hook:
```javascript
const isLoading = useSubscribe(enabled ? "tasks.byList" : null, listId);
```
When bypassed, `isLoading()` returns false. Changing the name or serialized
arguments causes the hook-managed subscription to be replaced and cleaned up.
## `useFind`
Return a `Mongo.Cursor`, not its fetched documents:
```javascript
const tasks = useFind(
() => Tasks.find({ listId }, {
fields: { title: 1, done: 1 },
sort: { createdAt: -1 },
}),
[listId],
);
```
`useFind` creates its own cursor observer. It preserves references for
unchanged documents, which helps memoized rows avoid unrelated renders.
Calling `.fetch()` in the factory defeats that contract and produces a
development warning.
The current v4 implementation defaults `deps` to `[]`. Include every React
value captured by the factory when changing that value must create a new
cursor. Do not add subscription work to the factory: it runs nonreactively and
exists only to select the cursor. Call `useSubscribe` separately.
Return `null` or `undefined` to disable the cursor without conditionally
calling the hook:
```javascript
const tasks = useFind(
() => enabled ? Tasks.find({ listId }) : null,
[enabled, listId],
);
```
Handle the nullable return before mapping.
## `useTracker`
Without a dependency array, the hook recreates its computation around renders
and returns the first reactive value synchronously:
```javascript
const user = useTracker(() => Meteor.user());
```
With dependencies, the computation is retained until a dependency changes:
```javascript
const task = useTracker(
() => Tasks.findOne({ _id: taskId }),
[taskId],
);
```
Use dependencies for captured inputs and measured expensive computations. Do
not add `[]` mechanically to a closure that reads changing props or state.
The reactive function can receive the current `Tracker.Computation`, although
some published type declarations omit that optional argument. Return data from
the function. Do not call React state setters or perform analytics, method
calls, timers, DOM work, or other arbitrary side effects there. Concurrent
rendering, Suspense, and error boundaries can cause an initial reactive
function to run more than once before commit.
Meteor subscriptions created in a `useTracker` computation are stopped with
the computation, but prefer `useSubscribe` when only readiness and lifetime
are needed.
## `skipUpdate`
The comparator returns true to skip an update:
```javascript
const task = useTracker(
() => Tasks.findOne(taskId),
[taskId],
(previous, next) =>
previous?._id === next?._id &&
previous?.updatedAt?.getTime() === next?.updatedAt?.getTime(),
);
```
Use it only after measuring a render problem. Do not deep-compare large query
results by default; the comparison can cost more than the render. Prefer
`useFind` plus memoized rows for lists.
## `withTracker`
Do not rewrite a working class-component container during unrelated
maintenance. Current v4 source still exports `withTracker`, but logs a
development deprecation warning and directs new code toward hooks. Isolate the
data container from the presentational component, then migrate in a focused
change with behavior tests.
## Data and authority boundaries
- Client hooks query Minimongo synchronously. Do not rewrite render-path reads
to server-style async Mongo only because the app uses Meteor 3.
- A subscription only delivers what its publication authorizes. Filters and
fields in a component are not security controls.
- Mutations belong in validated, authorized methods invoked with
`Meteor.callAsync`.
- Route publication design to `meteor-pubsub`, database semantics to
`meteor-mongo-minimongo`, and method design to `meteor-methods`.
Additional primary source:
[`meteor/react-packages`](https://github.com/meteor/react-packages/tree/master/packages/react-meteor-data)
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/react-meteor-data.md
@@ -1,149 +0,0 @@
# Suspense and async Tracker data
Import Suspense hooks from a distinct subpath:
```javascript
import {
useFind,
useSubscribe,
useTracker,
} from "meteor/react-meteor-data/suspense";
```
Do not switch import paths without changing signatures and adding pending and
error ownership.
## Classic versus Suspense
| Concern | Classic | Suspense |
|---------|---------|----------|
| Loading | `const isLoading = useSubscribe(...); isLoading()` | `useSubscribe(...)` throws until ready |
| Tracker | `useTracker(reactiveFn, deps?)` | `useTracker(key, asyncReactiveFn, deps?)` |
| Find | `useFind(() => Collection.find(...), deps?)` | `useFind(Collection, [selector, options], deps?)` |
| Errors | Component state or returned error | Rejected Promise reaches an error boundary |
| Server query | First synchronous Tracker read | `useTracker` and `useFind` can suspend server rendering |
Classic hooks remain supported. Choose Suspense because the application has a
deliberate boundary and async rendering strategy, not because it runs Meteor 3.
## Boundaries
Every suspending subtree needs a fallback and a rejection owner:
```jsx
<AppErrorBoundary>
<Suspense fallback={<TaskListSkeleton />}>
<TaskList listId={listId} />
</Suspense>
</AppErrorBoundary>
```
The nearest Suspense boundary owns pending Promises. A rejected subscription or
async tracker result is not a loading state; it must reach an error boundary or
another explicit rejection policy.
Place boundaries by user-visible loading unit. One root-wide fallback can hide
the entire application for an isolated refetch.
## Stable tracker keys
The first `useTracker` argument indexes a module-level cache. Use a stable,
specific key for one logical computation and avoid generic keys reused by
unrelated mounted components:
```javascript
const task = useTracker(
`task-details:${taskId}`,
() => Tasks.findOneAsync(taskId),
[taskId],
);
```
Keep dependency inputs in the dependency array. A key is cache identity, not a
replacement for captured-input dependencies.
## Reactivity after `await`
Tracker captures reactive dependencies while its computation is current. An
unrelated `await` clears that ambient context. Restore the hook's computation
around a later reactive read:
```javascript
import { Tracker } from "meteor/tracker";
const tasks = useTracker(
`visible-tasks:${listId}`,
async (computation) => {
const access = await Meteor.callAsync("lists.access", listId);
if (!access.allowed) return [];
return Tracker.withComputation(
computation,
() => Tasks.find({ listId }).fetchAsync(),
);
},
[listId],
);
```
If the reactive read occurs before the first `await`, the hook captures it
without the extra wrapper. Wrap the smallest reactive read after `await`, not
the network request or entire component.
## Suspense `useSubscribe`
Use it as a statement:
```javascript
useSubscribe("tasks.byList", listId);
```
At `react-meteor-data` 4.0.1, the published declaration says the hook returns a
`Meteor.SubscriptionHandle`, while the client implementation resolves to
`null` and the server implementation returns `undefined`. The package docs
also say it does not return a handle. Do not consume the return value. If the
component must manually stop or inspect a handle, use a separately owned
subscription strategy instead of relying on this mismatch.
The client cache identifies subscriptions from the name and EJSON-serialized
parameters and delays cleanup to tolerate React Strict Mode effect replay. Do
not reproduce that cache in application code.
## Suspense `useFind`
The second argument is the argument tuple passed to `Collection.find`:
```javascript
const tasks = useFind(Tasks, [
{ listId },
{ fields: { title: 1 }, sort: { createdAt: -1 } },
], [listId]);
```
Pass `null` to disable the query. Do not pass a cursor factory or call
`.fetch()` as with the classic signature. On the client it observes Minimongo;
on the server it uses `fetchAsync()` and suspends until the query resolves.
## Server rendering limits
Suspense `useFind` and `useTracker` have server paths, but a client subscription
does not populate server-rendered Minimongo. The current Suspense
`useSubscribe` server path is a no-op. Design server data preload, request
scoping, error handling, and hydration deliberately. Verify the exact package
version before relying on changelog-only SSR hooks; the current public subpath
exports only `useFind`, `useSubscribe`, and `useTracker`.
## Anti-patterns
- Consume the Suspense `useSubscribe` return as a handle.
- Use the same key such as `"user"` for multiple unrelated mounted trackers.
- Put a changing prop only in the key while omitting it from dependencies.
- Add Suspense without an error boundary for rejected Promises.
- Assume a server-side subscription populated data during SSR.
- Wrap every sync Minimongo query in an async Suspense tracker.
Additional primary source:
[`meteor/react-packages` Suspense implementation](https://github.com/meteor/react-packages/tree/master/packages/react-meteor-data/suspense)
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/react-meteor-data.md
-214
View File
@@ -1,214 +0,0 @@
---
name: meteor-security
description: >
Use when auditing or hardening a Meteor 3 application. Triggers on
missing check() on method arguments, missing this.userId guards on
publications, browser-policy CSP, DDPRateLimiter rules, oauth-encryption
via Accounts.config oauthSecretKey, audit-argument-checks, allow/deny
legacy patterns, BrowserPolicy.content.disallowInlineScripts,
BrowserPolicy.framing.disallow. Use this skill when the user asks about
hardening, asks about a security review, or asks about CSP for a
third-party script (Stripe, Google Maps, fonts).
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: security
tagline: "Audit and harden Meteor 3 apps (`check()` coverage, `this.userId` guards, browser-policy CSP, rate limits, oauth-encryption)."
bundle: ["essentials", "fullstack"]
docs_synced_at: "2026-09-23"
license: MIT
---
# Meteor security
Meteor's security model is opinionated: the server holds authority, the
client cannot be trusted, and the only places that filter data before it
reaches users are methods (write paths) and publications (read paths).
## Decision flow
1. Audit every method: does it `check()` every argument and guard on
`this.userId` or `Meteor.userId()` when authentication matters?
2. Audit every publication: does it filter by `this.userId` (when
user-specific) and project columns with `fields`?
3. Add `audit-argument-checks` in dev to catch missing `check()`.
4. Add `browser-policy` and configure CSP.
5. Add `DDPRateLimiter` rules for sensitive methods (login, password
reset, resource creation).
6. If the app uses OAuth, set `oauthSecretKey` to encrypt provider
secrets at rest.
7. Remove `allow` / `deny` rules. They are legacy and easy to misuse;
use methods instead.
## Method guard checklist
```javascript
import { Meteor } from "meteor/meteor";
import { check, Match } from "meteor/check";
Meteor.methods({
async updateProfile(payload) {
check(payload, { displayName: String, bio: Match.Optional(String) });
if (!this.userId) {
throw new Meteor.Error("not-authorized");
}
await Meteor.users.updateAsync(this.userId, { $set: { profile: payload } });
},
async updateAddress(payload) {
check(payload, String);
if (!Meteor.userId()) {
throw new Meteor.Error("not-authorized");
}
await Meteor.users.updateAsync(Meteor.userId(), { $set: { address: payload } });
},
});
```
Reject any method that does not match: `check` on every argument, userId
gate when needed, `Meteor.Error(code, reason)` for failures, `*Async`
Mongo on the server.
## Publication guard checklist
```javascript
Meteor.publish("items.mine", function () {
if (!this.userId) return this.ready();
return Items.find(
{ ownerId: this.userId },
{ fields: { title: 1, qty: 1 }, limit: 200 },
);
});
```
Reject any publication that returns an unbounded cursor, omits the field
projection, or skips a userId filter on user-specific data.
## CSP via `browser-policy`
```bash
meteor add browser-policy
```
```javascript
// server top-level or inside Meteor.startup
import { BrowserPolicy } from "meteor/browser-policy-common";
import { Meteor } from "meteor/meteor";
Meteor.startup(async () => {
await BrowserPolicy.content.disallowInlineScripts();
BrowserPolicy.content.disallowEval();
BrowserPolicy.framing.disallow();
});
```
`BrowserPolicy` is server-only. Configure it during module initialization or
startup so every request receives one deterministic process-wide policy. The
current implementation invalidates its cached CSP after a mutation, but do not
mutate this global policy per request or per user. See
`references/browser-policy-csp.md` for recipes (Stripe, Google Maps,
fonts, inline-style allowance).
## DDPRateLimiter for sensitive methods
```javascript
import { DDPRateLimiter } from "meteor/ddp-rate-limiter";
DDPRateLimiter.addRule(
{
type: "method",
name: "login",
clientAddress: () => true,
},
5,
60000, // 5 attempts per 60s, per IP
);
```
Only matcher fields contribute to the rate-limit bucket key. Without
`clientAddress`, `connectionId`, or `userId`, every matching caller shares one
global bucket. Meteor 3.5+ permits async matcher functions for database-backed
decisions; keep their queries fast because the connection waits for them. On
Meteor 3.0 through 3.4, matchers must stay synchronous. Use a fixed rule,
precomputed synchronous state, or upgrade rather than awaiting Mongo there.
The default rule (5 in 10s per matched method per DDP connection for login / signup / password
reset) ships with `accounts-base`. Meteor 3.6-beta.1's
`accounts-base@3.4.0-beta360.1` also matches `requestLoginTokenForUser`;
`accounts-passwordless@3.1.2-beta360.1` validates its complete payload before
lookup/creation. Inspect both package versions on older apps. Remove the
default rule with `Accounts.removeDefaultRateLimit()` only if you replace it.
For cookie hardening on `accounts-base@3.4.0-beta360.1`, use `meteor-accounts`:
trusted origins, valid tokens, no-store responses and `SameSite=Strict` have
specific migration checks. Its 30-per-10-second HTTP endpoint limit is per
client address, separate from DDP. HttpOnly storage does not stop active
same-origin XSS from obtaining the resume token used for DDP authentication.
## OAuth secret encryption
Add `oauth-encryption` and pass a 16-byte base64 key (NOT 32 bytes) to
`Accounts.config` at module top level (not inside `Meteor.startup`):
```bash
meteor node -e "console.log(require('crypto').randomBytes(16).toString('base64'))"
```
```javascript
import { Accounts } from "meteor/accounts-base";
Accounts.config({
oauthSecretKey: Meteor.settings.oauthSecretKey,
});
```
At startup, `accounts-oauth` seals an unsealed provider application secret at
`ServiceConfiguration.configurations.secret`. Provider packages also seal
supported per-user token fields, such as `services.github.accessToken` or
Twitter's `accessTokenSecret`. There is no generic
`Meteor.users.services.<provider>.secret` field. Inspect the provider schema
before asserting which user credential is encrypted.
## `audit-argument-checks`
```bash
meteor add audit-argument-checks
```
Throws if any method or publication runs without `check()` covering
every argument. Methods that legitimately accept arbitrary input declare
this explicitly:
```javascript
Meteor.methods({
rawLog(...args) {
check(args, [Match.Any]);
// ...
},
});
```
## Anti-patterns
- `Collection.allow` / `Collection.deny` rules. Legacy; easy to combine
into a soft-fail. Replace with methods.
- `Meteor.settings.public.<secret>`. The client sees `public`. Move
secrets to the top level of `settings.json`.
- Publish the entire `Meteor.users` collection. Always project (e.g.
`fields: { username: 1, profile: 1 }`) and filter. Publish email only to
the owning user or another explicitly authorized audience.
- Use `BrowserPolicy.content.allowOriginForAll` for a third-party script. It
grants the origin to every current content directive. Allow only the script,
frame, connect, image, style, or font directives the integration needs.
- Methods that accept callback-shaped arguments. Functions cannot travel
over DDP.
- Call `Accounts.config({ oauthSecretKey })` inside `Meteor.startup`.
Must be at module top level so it loads before the OAuth packages
read it.
## See also
- `references/method-and-publish-guards.md`
- `references/browser-policy-csp.md`
- `references/eval-cases.md`
- Related skills: `meteor-methods`, `meteor-pubsub`, `meteor-accounts`.
@@ -1,88 +0,0 @@
# `browser-policy` CSP recipes
`BrowserPolicy` is server-only. Call its functions at module top level or
inside `Meteor.startup` so policy initialization is deterministic. The policy
is process-global, not request-specific. Current implementations invalidate
the cached CSP when it changes, but do not use runtime mutation for per-user or
per-route authorization.
## Install
```bash
meteor add browser-policy
```
Pulls in both `browser-policy-content` (CSP) and `browser-policy-framing`
(X-Frame-Options). Add either standalone for a smaller surface.
## Tight default
```javascript
import { BrowserPolicy } from "meteor/browser-policy-common";
await BrowserPolicy.content.disallowInlineScripts();
BrowserPolicy.content.disallowEval();
BrowserPolicy.framing.disallow();
```
`disallowInlineScripts`, `allowInlineScripts`, and `setPolicy` are async in
current Meteor. Await them from an async startup callback when startup order
matters.
Removes `eval`, inline `<script>` blocks, and embedding by other sites.
## Stripe Checkout / Elements
```javascript
BrowserPolicy.content.allowScriptOrigin("https://js.stripe.com");
BrowserPolicy.content.allowFrameOrigin("https://js.stripe.com");
BrowserPolicy.content.allowFrameOrigin("https://hooks.stripe.com");
BrowserPolicy.content.allowConnectOrigin("https://api.stripe.com");
```
Inspect CSP violation reports for the Stripe features actually enabled. Add a
new origin only to the directive named by the violation.
## Google Maps / Fonts / GTM
```javascript
BrowserPolicy.content.allowScriptOrigin("https://maps.googleapis.com");
BrowserPolicy.content.allowConnectOrigin("https://maps.googleapis.com");
BrowserPolicy.content.allowStyleOrigin("https://fonts.googleapis.com");
BrowserPolicy.content.allowFontOrigin("https://fonts.gstatic.com");
BrowserPolicy.content.allowScriptOrigin("https://www.googletagmanager.com");
```
Do not replace these calls with `allowOriginForAll`. That helper adds the
origin to every directive already in the policy, including resource types the
provider does not need.
## Inline styles (framework injects them)
```javascript
BrowserPolicy.content.allowInlineStyles();
```
Tradeoff: weakens style protection. Use only when the framework (e.g.
Material UI, styled-components) genuinely needs it.
## Frame-ancestors (Chrome / Safari)
`X-Frame-Options` is partly ignored by Chrome / Safari. To restrict
framing across browsers, use the CSP `frame-ancestors` directive:
```javascript
BrowserPolicy.content.allowFrameAncestorsOrigin("https://example.com");
```
## Reset
```javascript
await BrowserPolicy.content.setPolicy(...) // override entire content policy
BrowserPolicy.framing.allowAll() // unset X-Frame-Options
```
Used in tests where the default policy interferes.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/browser-policy.md
@@ -1,117 +0,0 @@
# Evaluation cases for `meteor-security`
## Case 1: missing `check()`
Prompt: "Audit this method:
```javascript
Meteor.methods({ async addItem(p) { await Items.insertAsync(p); } });
```
"
Pass if the agent flags missing `check()`, missing `this.userId` guard,
and rewrites with `check(p, { title: String, qty: Match.Integer })` plus
a userId gate.
## Case 2: leaky publication
Prompt: "What's wrong with this publication?
```javascript
Meteor.publish('items', function () { return Items.find({}); });
```
"
Pass if the agent flags missing `this.userId` filter, missing `fields`
projection, and missing `limit` on an unbounded cursor.
## Case 3: Stripe CSP
Prompt: "Add a CSP that lets Stripe Checkout load."
Pass if the agent uses `browser-policy`, calls
`BrowserPolicy.content.allowScriptOrigin("https://js.stripe.com")`, and
adds `BrowserPolicy.content.allowFrameOrigin("https://js.stripe.com")`
and `"https://hooks.stripe.com"`. It may add
`allowConnectOrigin("https://api.stripe.com")` when the integration needs it.
Fail if it uses `allowOriginForAll`.
## Case 4: OAuth secret in plaintext
Prompt: "My Google application secret in
`ServiceConfiguration.configurations.secret` is plaintext, and I also want
supported per-user OAuth tokens encrypted at rest."
Pass if the agent adds `oauth-encryption`, generates a 16-byte (not 32)
base64 key, and configures
`Accounts.config({ oauthSecretKey: Meteor.settings.oauthSecretKey })`
at module top level (not inside `Meteor.startup`). It must distinguish the
provider application secret from provider-specific user fields and reject a
generic `services.<provider>.secret` path.
## Case 5: allow/deny in legacy code
Prompt: "I have `Items.allow({ insert: () => true });` in my code. Is
that ok?"
Pass if the agent rejects allow/deny as a legacy pattern and rewrites the
mutation as a `Meteor.method` with `check()` + `this.userId` guard.
## Case 6: async publication authorization
Prompt: "Audit this publication. It awaits an organization membership check
and then returns a filtered cursor from an async publish handler."
Pass if the agent validates the authorization selector and projection while
accepting the async handler. Fail if it requires the low-level publish API
only because the handler returns a Promise.
## Case 7: per-IP limiter is accidentally global
Prompt: "I limited the `login` method with `{ type: 'method', name: 'login' }`,
but one client's failures block every user. I wanted five attempts per IP."
Pass if the agent explains that only matcher fields form the bucket key and
adds `clientAddress: () => true`. It should test two addresses with independent
counters. Fail if it changes only the numeric limit.
## Case 8: database-backed rate decision
Prompt: "On Meteor 3.5, apply a stricter method limit to free-tier users. The
tier is in `Meteor.users`."
Pass if the agent uses a projected `findOneAsync` inside an async `userId`
matcher, warns that it delays message processing on the connection, and
defines behavior for a rejected matcher Promise.
## Case 9: audit argument checks
Prompt: "How can I detect methods and publications that forgot to validate
all DDP arguments?"
Pass if the agent adds `audit-argument-checks`, validates every argument with
`check`, and uses `check(args, [Match.Any])` only when arbitrary arguments are
intentional. Fail if it treats the package as a replacement for authorization.
## Case 10: user directory email leak
Prompt: "Publish usernames and profiles for our member directory. Should I
include every member's `emails` field too?"
Pass if the agent defaults to `{ username: 1, profile: 1 }`, filters and limits
the directory, and includes email only for a concrete authorized requirement.
## Case 11: database-backed limiter before Meteor 3.5
Prompt: "On Meteor 3.4, make a DDP rate-limit matcher await a user plan lookup."
Pass if the agent says async matchers begin in Meteor 3.5, rejects the awaited
matcher on 3.4, and offers a synchronous fixed rule, precomputed state, or a
framework upgrade. Fail if it applies the current 3.5 API unconditionally.
## Case 12: Accounts hardening ownership
Prompt: "Review Meteor 3.6-beta.1 passwordless and HttpOnly-cookie abuse protections. Are their rate limits interchangeable, and does HttpOnly remove our XSS risk?"
Pass if the agent: Keeps security audit ownership and uses meteor-accounts for configuration details. Separates per-connection DDP and per-address HTTP limits, checks resolved beta packages, preserves method authorization and notes the in-memory DDP token remains exposed to active same-origin XSS.
Fail if it contradicts these boundaries or invents unsupported APIs.
@@ -1,89 +0,0 @@
# Method and publish guards
The two attack surfaces an agent must audit on every PR.
## Method checklist
For every `Meteor.methods({ ... })` entry:
- [ ] `check()` on every argument.
- [ ] `this.userId` guard when authentication is required.
- [ ] Role check when elevated privileges are required (e.g.
`alanning:roles`).
- [ ] `Meteor.Error(code, reason, details?)` thrown on failure; never a
plain `Error` (the client gets `"Internal server error"`).
- [ ] `*Async` Mongo on the server. Sync Mongo is removed in Meteor 3.
- [ ] `DDPRateLimiter.addRule` if the method is rate-sensitive (login,
password reset, resource creation, expensive queries).
```javascript
Meteor.methods({
async addItem(payload) {
check(payload, { title: String, qty: Match.Integer });
if (!this.userId) throw new Meteor.Error("not-authorized");
return await Items.insertAsync({
...payload,
ownerId: this.userId,
createdAt: new Date(),
});
},
});
```
## Publication checklist
For every `Meteor.publish(...)`:
- [ ] `this.userId` filter when data is user-specific.
- [ ] `fields` projection limiting columns.
- [ ] `limit` and `sort` on unbounded collections.
- [ ] An async publish handler may await authorization or setup work and
return a cursor. Cursor `transform` callbacks remain synchronous; use
the low-level API for per-document async output.
```javascript
Meteor.publish("items.mine", function () {
if (!this.userId) return this.ready();
return Items.find(
{ ownerId: this.userId },
{
fields: { title: 1, qty: 1, updatedAt: 1 },
sort: { updatedAt: -1 },
limit: 200,
},
);
});
```
## Sensitive-fields denylist
For `Meteor.users`:
```javascript
Meteor.publish("users.public", function () {
if (!this.userId) return this.ready();
return Meteor.users.find(
{},
{ fields: { username: 1, profile: 1 }, limit: 200 },
);
});
```
Never publish `services.*`. That subtree holds OAuth secrets, password
bcrypt hashes, and resume tokens. Do not publish every user's `emails` field by
default. Publish an email only to the owning user or to a narrowly selected,
explicitly authorized audience.
## Audit packages
```bash
meteor add audit-argument-checks
```
Crashes the request when a method or publish handler runs without
`check()` covering every argument. Dev-time signal; safe to leave on in
production too.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/security/security.md
-243
View File
@@ -1,243 +0,0 @@
---
name: meteor-testing
description: >
Use when setting up, designing, writing, or repairing tests and test
harnesses in a Meteor 3 app. Triggers on
meteortesting:mocha, --driver-package, TEST_WATCH, TEST_BROWSER_DRIVER,
MOCHA_GREP, meteor.testModule, focused tests, .only,
Meteor.server.method_handlers, Meteor.server.publish_handlers,
DDP.connect, --full-app integration mode, sinon, async test signatures,
Playwright/Cypress E2E. Use this skill when the user asks about test
runners, asks about testing publications, or asks about Jest vs Mocha
in Meteor. For a failing, hanging, or flaky test whose failing layer or root
cause is unknown, use meteor-debugging before changing the test or app.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: testing
tagline: "Set up and write Meteor 3 tests (`meteortesting:mocha`, async signatures, methods/publications, Playwright/Cypress E2E)."
bundle: ["fullstack"]
docs_synced_at: "2026-09-29"
license: MIT
---
# Testing Meteor 3 apps
`meteortesting:mocha` is the canonical Meteor test driver. It boots the
app in test mode (no app code runs except the test files) and reports
results in the server console.
If an existing test fails, hangs, or flakes and the failing layer is unknown,
use `meteor-debugging` to isolate the cause. Return here when evidence points to
test setup, design, driver behavior, fixtures, or regression coverage.
## Decision flow
1. Unknown failure in an existing test? Use `meteor-debugging` to classify
application, data, harness, browser, environment, or shared-state causes.
2. Pure logic, no Meteor APIs? Plain Mocha or any test runner; nothing
Meteor-specific.
3. Method or publication? Integration test it with `meteortesting:mocha`
using `Meteor.server.method_handlers[name].apply(ctx, args)` or
`publish_handlers`.
4. Need to drive a real DDP client (cross-process or end-to-end DDP
semantics)? Use `--full-app` mode and `DDP.connect`.
5. UI flow / browser interaction? Start the normal app with deterministic
test settings and run Playwright or Cypress against it. Use
`meteor test --full-app` only when the browser flow must load app-test
modules.
## Setup
```bash
meteor add meteortesting:mocha
meteor npm install --save-dev @types/mocha
```
```json
// package.json
{
"scripts": {
"test": "TEST_WATCH=1 meteor test --driver-package meteortesting:mocha",
"test:ci": "meteor test --once --driver-package meteortesting:mocha",
"test:full": "meteor test --full-app --driver-package meteortesting:mocha"
}
}
```
Test-mode conventions:
- Normal test mode eagerly loads `*.test[s].*` and `*.spec[s].*` files, while
ordinary application code loads only when imported by a test.
- Filename discovery ignores `tests/` directories. A configured
`meteor.testModule` instead loads its explicit entry module and imports.
- `--full-app` eagerly loads the normal app plus `*.app-test[s].*` and
`*.app-spec[s].*` files, and sets `Meteor.isAppTest`.
For Meteor 3.5.2 Rspack full-app/TLA behavior, parent-`private` discovery
failures, and the jQuery harness regression fixed in Meteor 3.6-beta.0, read
[release-specific test setup](references/meteor-3.5.2-testing.md). Check
resolved packages and suite counts before applying a version-specific fix.
To focus an existing test, prefer a supported driver filter such as
`MOCHA_GREP` after checking the installed driver in `.meteor/versions`; use
`.only` only temporarily. These select registered tests but do not prevent
other test modules from evaluating. If loading itself causes interference,
inspect `meteor.testModule` and read `references/focused-runs.md` before
narrowing entrypoint imports. Restore every temporary focus or import change,
then run the normal affected suite. Read the configured entrypoint paths from
the project; do not invent paths, scripts, ports, or helpers.
For 3.6-beta.3 Rspack ignore exceptions or separate legacy test entries, use
the [architecture and ignore boundaries](references/focused-runs.md#rspack-architecture-and-ignore-boundaries).
Check expected suites on each selected program; a modern zero-exit run is
not proof of legacy coverage.
## Method test (server-side)
```javascript
import assert from "node:assert/strict";
import { Meteor } from "meteor/meteor";
import { Items } from "/imports/api/items";
if (Meteor.isServer) {
describe("items.add", function () {
beforeEach(async function () {
await Items.removeAsync({});
});
it("inserts when authed", async function () {
const _id = await Meteor.server.method_handlers["items.add"].apply(
{ userId: "u1" },
[{ title: "x", qty: 1 }],
);
const doc = await Items.findOneAsync(_id);
assert.equal(doc.title, "x");
});
it("rejects when unauthed", async function () {
await assert.rejects(() =>
Meteor.server.method_handlers["items.add"].apply({ userId: null }, [{}]),
);
});
});
}
```
`.apply(context, argsArray)` is the documented form;
`Meteor.server.method_handlers[name]` is the registered method
implementation. Pass a stub `this` with `userId` (and `unblock`,
`connection`, etc. when needed).
## Publication test (server-side)
```javascript
if (Meteor.isServer) {
describe("items.mine publication", function () {
it("only ships the subscribing user's items", async function () {
await Items.removeAsync({});
await Items.insertAsync({ _id: "a", ownerId: "u1" });
await Items.insertAsync({ _id: "b", ownerId: "u2" });
const cursor = await Meteor.server.publish_handlers["items.mine"]
.apply({ userId: "u1" }, []);
const docs = await cursor.fetchAsync();
assert.deepEqual(docs.map((d) => d._id), ["a"]);
});
});
}
```
For publications using the low-level `this.added` / `this.changed` API,
test with a real DDP client via `--full-app` mode (next section).
Always await the direct publish handler. Conventional handlers return the
cursor immediately; async handlers return a Promise of the cursor.
## End-to-end DDP test (`--full-app` mode)
```javascript
import { DDP } from "meteor/ddp-client";
import { Mongo } from "meteor/mongo";
import { Tracker } from "meteor/tracker";
const conn = DDP.connect(Meteor.absoluteUrl());
const RemoteItems = new Mongo.Collection("items", { connection: conn });
function ready(sub) {
return new Promise((resolve) => {
const computation = Tracker.autorun((c) => {
if (sub.ready()) {
c.stop();
resolve();
}
});
});
}
const sub = conn.subscribe("items.mine");
await ready(sub);
const docs = RemoteItems.find().fetch();
```
Run with `meteor test --full-app --driver-package meteortesting:mocha`.
## Client unit test (Minimongo)
```javascript
if (Meteor.isClient) {
describe("Items minimongo", function () {
beforeEach(function () { Items.remove({}); });
it("filters by ownerId", function () {
Items.insert({ _id: "a", ownerId: "u1" });
Items.insert({ _id: "b", ownerId: "u2" });
assert.equal(Items.find({ ownerId: "u1" }).count(), 1);
});
});
}
```
Client tests run in the browser the driver spawns. With
`TEST_BROWSER_DRIVER=puppeteer`, the browser is headless Chromium and
results flow back to the server console.
Do not treat a server-only green run as complete client coverage. The driver
prints a message when no browser is connected; configure
`TEST_BROWSER_DRIVER` in CI and confirm client test counts are present.
## Browser E2E
Run Playwright or Cypress against the normal application unless the test
needs Meteor's app-test modules. The server command must work from a clean
clone with a tracked, nonsecret settings fixture or fully documented test
environment variables. Do not point it at an ignored developer settings file.
Cover at least one complete mutation flow and one rejected server action.
Basic page-title checks do not exercise async method stubs, authorization, or
publication readiness.
## Anti-patterns
- Reach for Jest. Jest does not understand Meteor's build system. Use
`meteortesting:mocha`.
- Mock Mongo. Run the real driver against a clean DB.
- Forget `if (Meteor.isServer) { ... }` guards. Server tests crash if
they run in the browser harness.
- Skip `beforeEach` cleanup. Tests leak state across runs.
- Catch and log a `beforeEach` failure without rethrowing. The test then runs
against unknown state and can report a misleading assertion.
- Assert only the database postcondition for a rejected method. Also require
the Promise to reject with the expected `Meteor.Error`.
- Replace `Meteor.userId` or another global without restoring it in
`afterEach`.
- Use `Meteor.call` with callbacks in async test code. Use
`Meteor.callAsync` or unwrap `method_handlers` directly.
## See also
- `references/mocha-setup.md`
- `references/focused-runs.md`
- `references/ddp-test-helpers.md`
- `references/eval-cases.md`
@@ -1,88 +0,0 @@
# DDP-based test helpers
`--full-app` mode runs the whole app alongside tests. A second DDP
connection lets you drive the app like a client would and inspect its
local state.
## Connect to the running app
```javascript
import { DDP } from "meteor/ddp-client";
const conn = DDP.connect(Meteor.absoluteUrl());
```
`conn` is a stand-alone DDP client. It has its own resume token, its own
collections, its own subscription handles.
Register each named collection against that connection before subscribing:
```javascript
import { Mongo } from "meteor/mongo";
const RemoteItems = new Mongo.Collection("items", { connection: conn });
```
## Wait for a subscription to be ready
```javascript
import { Tracker } from "meteor/tracker";
function ready(sub) {
return new Promise((resolve) => {
const computation = Tracker.autorun((c) => {
if (sub.ready()) {
c.stop();
resolve();
}
});
});
}
const sub = conn.subscribe("items.mine");
await ready(sub);
```
## Inspect the resulting documents
```javascript
const docs = RemoteItems.find().fetch();
```
Do not inspect `conn._stores`, `._docs`, or `conn.connection`. The first two
are private internals, and `DDP.connect` returns the connection directly, so
there is no nested `.connection`. A collection constructed with
`{ connection: conn }` is the supported local-cache interface.
## Method invocation on a separate connection
```javascript
await conn.callAsync("items.add", { title: "x", qty: 1 });
```
This goes over the wire, hits the real method handler, and the result is
the value the method resolved to.
## Disconnect
```javascript
conn.disconnect();
```
Call this in `after` / `afterEach` so the test process exits cleanly.
## When to use which
| Need | Use |
|-----------------------------------------|------------------------------------------------------------------|
| Test a method's logic | `Meteor.server.method_handlers[name].apply(ctx, args)` directly. |
| Test a publication's cursor | `Meteor.server.publish_handlers[name].apply({ userId }, [])`. |
| Test the full DDP path (auth, ratelimits, multi-user merge) | `DDP.connect(Meteor.absoluteUrl())` + `--full-app`. |
| Test client reactivity through DDP | `--full-app` + `DDP.connect` + Tracker autorun. |
Direct `method_handlers` / `publish_handlers` invocation is the fast
default. Reach for `--full-app` and `DDP.connect` only when the path
under test actually depends on the network round trip.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/testing/testing.md
@@ -1,213 +0,0 @@
# Evaluation cases for `meteor-testing`
## Case 1: setup from zero
Prompt: "Set up Mocha tests for my Meteor 3 app."
Pass if the agent adds `meteortesting:mocha`, writes the `package.json`
scripts (with `--once` for CI and `TEST_WATCH=1` for dev), and shows a
`.test.js` example with `if (Meteor.isServer)` guards.
## Case 2: method handler test
Prompt: "Write a test for my `items.add` method."
Pass if the agent uses
`Meteor.server.method_handlers["items.add"].apply({ userId: "u1" }, [args])`
with a stubbed userId and awaits the Mongo result. Avoids
`Meteor.call`/`callAsync` from the test (which goes over the wire and
adds DDP overhead).
## Case 3: publication test
Prompt: "Test that my `items.mine` publication only ships items owned by
the subscribing user."
Pass if the agent uses
`await Meteor.server.publish_handlers["items.mine"].apply(
{ userId: "u1" }, [])`, calls `.fetchAsync()` on the resolved cursor, and
asserts on the returned `_id`s. The `await` is required so the test also
works when the publication handler is async.
## Case 4: --full-app DDP test
Prompt: "I need to test that an unauthed client cannot see my admin
publication's documents even over DDP."
Pass if the agent uses `meteor test --full-app`, then `DDP.connect` to a
second client and `subscribe` without logging in, and asserts on the
empty named collection created with
`new Mongo.Collection(name, { connection: conn })`. Fail if it reads
`conn.connection._stores`, `conn._stores`, or another private cache.
## Case 5: Jest detour
Prompt: "Can I use Jest instead of Mocha?"
Pass if the agent steers away from Jest, explains Meteor's build system
exposes a test-driver hook that Jest does not implement, and recommends
`meteortesting:mocha` (or any other Meteor test-driver package).
## Case 6: swallowed async setup failure
Prompt: "My `beforeEach` catches and logs `removeAsync` and `insertAsync`
errors, but later assertions fail with unexpected document counts."
Pass if the agent removes the catch or rethrows, requires setup to reject the
test, and isolates startup seeding from the test database.
## Case 7: negative method assertion
Prompt: "This authorization test only checks that the document count did not
change after `callAsync`. Is that enough?"
Pass if the agent also asserts that `callAsync` rejects with the expected
`Meteor.Error`, while retaining the postcondition as a second assertion.
## Case 8: client tests silently skipped
Prompt: "All server tests pass, but the runner says to load the app in a
browser. Can CI still be green?"
Pass if the agent says client tests were not executed, configures
`TEST_BROWSER_DRIVER`, and checks that client test results appear in CI.
## Case 9: Playwright clean-checkout server
Prompt: "Playwright's webServer uses `private/settings.dev.json`, which is
ignored and missing in CI. How should I validate the migration?"
Pass if the agent introduces a tracked nonsecret test fixture or explicit
environment setup, starts the normal app deterministically, and covers a
mutation plus a rejected action rather than only static page checks.
## Case 10: ignored tests directory
Prompt: "Why does `meteor test` ignore `tests/users.test.js`, and what filename
should I use for a full-app test?"
Pass if the agent explains that every `tests/` directory is ignored by the
Meteor build tool, moves a normal test to a non-ignored path matching
`*.test[s].*` or `*.spec[s].*`, and uses `*.app-test[s].*` or
`*.app-spec[s].*` for `--full-app`. Fail if it says the directory itself is a
discovery convention.
## Case 11: CI Node for Meteor 3.3
Prompt: "Configure the CI Node version for a Meteor 3.3 test job. Can it reuse
Node 20 from Meteor 3.0?"
Pass if the agent selects Node 22 for Meteor 3.3, explains that only Meteor 3.0
uses Node 20 while 3.1 through 3.4 use Node 22, and recommends `meteor node -v`
to verify the exact target. Fail if it treats all pre-3.4 releases as Node 20.
## Case 12: unexplained failing-test near miss
Prompt: "A full-app Meteor test hangs only in CI. I do not know whether the
problem is its DDP subscription, database cleanup, browser driver, or product
code. Rewrite the test to make it pass."
Pass if the agent routes first to `meteor-debugging` to preserve the failure,
compare local and CI evidence, and isolate the application, data, harness,
browser, environment, or shared-state boundary. It should return to
`meteor-testing` only after evidence identifies test setup, design, driver,
fixture, or regression work. Fail if it rewrites the test or raises timeouts
before classifying the failure.
## Case 13: focus one test through the Meteor driver
Prompt: "I use `meteortesting:mocha`. How can I repeatedly run only the
`items.add` unauthenticated case without changing which modules Meteor loads?"
Pass if the agent checks the installed driver version and uses `MOCHA_GREP`
with a quoted regular expression matching the full test title. It may offer
temporary `it.only`, but requires cleanup and an affected-suite run. Fail if it
invents an unsupported `meteor test --grep` flag, requires `.only` on every
ancestor, or edits the test module graph for ordinary execution focus.
## Case 14: focus test module loading
Prompt: "Our `meteor.testModule` entrypoints import every spec. `MOCHA_GREP`
focuses the assertion, but module-scope setup from unrelated imports still
runs. How can I isolate this safely?"
Pass if the agent distinguishes execution filtering from module loading and
temporarily narrows the configured entrypoint import graph only because
load-time behavior is the problem. It preserves and restores the imports,
removes focus markers, and runs the normal affected suite. Fail if it claims
the title filter prevents module evaluation, changes private runner internals,
or gives project-specific paths, ports, helpers, or scripts.
## Case 15: full-app tests with a server-only test entry
Prompt: "On Meteor 3.5.2 with its paired Rspack packages, mainModule has client
and server entries, testModule has only a server entry, and the server imports
a module with top-level await. How should full-app tests load this app?"
Pass if the agent keeps the configured application client/server bundles,
awaits the module initialization, and separates client bundle compilation from
client test execution. Fail if it removes the app client entry, adds a sleep,
or guarantees every detached Promise or async startup callback has settled.
## Case 16: zero full-app tests below a parent private path
Prompt: "A Meteor 3.5.1 Rspack app under /workspace/private/my-app runs zero
full-app tests; the same commit elsewhere discovers them. Should I remove all
private-directory exclusions?"
Pass if the agent checks the 3.5.2 eager-discovery fix and the app-relative test
patterns and entrypoints, proposes a paired upgrade or a disposable path
reproduction, and preserves the app's private-assets exclusion. Fail if it
accepts zero passing tests as validation or includes private assets as tests.
## Case 17: package test lost transitive jQuery
Prompt: "After test-in-browser updated to 1.6.0 with Meteor 3.5.2, my package's
client tests fail because they use jQuery. Where should I declare it?"
Pass if the agent adds `jquery` to the existing `Package.onTest` client
dependencies or uses `meteor test-packages --extra-packages=jquery` with the
real package target. Fail if it changes unrelated production app dependencies.
## Case 18: jQuery-free tests and earlier packages
Prompt: "One branch uses test-in-browser 1.5.x; another uses 1.6.0. Neither
branch's tests uses jQuery. Must I add jquery to both apps for Meteor 3.5.2?"
Pass if the agent rejects adding production dependencies, distinguishes the
1.6.0 harness regression from the package's own jQuery-free tests, and checks
whether the browser UI starts. It offers an invocation-only extra package or
compatible fixed driver for a failing 1.6.0 harness, not for working 1.5.x.
Fail if it claims jQuery-free tests prove driver 1.6.0 cannot need jQuery.
## Case 19: restored driver in the 3.6 beta
Prompt: "Meteor 3.6-beta.0 resolves test-in-browser 1.6.1-beta360.0. My package
tests do not use jQuery. Should I add it to the app before running test-packages?"
Pass if the agent recognizes the restored driver dependency, adds no app or
unneeded package-test dependency, and verifies the UI and expected client/server
assertions. Fail if it repeats the 1.6.0 workaround unconditionally.
## Case 20: CI runtime for beta.1
Prompt: "Adapt our Node 24 Meteor 3.5.2 test job for a deliberate upgrade to 3.6-beta.1. What runtime and native dependency checks belong in CI?"
Pass if the agent: Verifies the selected Meteor runtime, uses Node 26.8.2/npm 11.19.0 for beta.1, rebuilds native deps and preserves frozen dependency installation and actual client/server test execution. Does not claim existing 3.5.2 jobs need Node 26.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 21: Rspack test file exceptions
Prompt: "In beta.3 our Rspack CI should load *.tests.js only directly under imports/accounts, while excluding other *.tests.js. We also have a root test/ data directory. How should the file selection and pass check work?"
Pass if the agent uses ordered file/environment negation with included parents, distinguishes file selection from Mocha title filtering, preserves generated entries and checks expected names/counts.
Fail if it uses only MOCHA_GREP to prevent module evaluation, ignores _build/test or accepts zero cases.
## Case 22: Legacy program coverage
Prompt: "On beta.3 our testModule maps client and legacy separately. meteor test --once with current Chromium passes. Have we covered legacy browsers? What about the same setup pinned to beta.1?"
Pass if the agent requires explicit legacy program selection with webArchOnly false/no exclusion, expected cases per program and actual engine tests; explains beta.1 lacks the complete separate-graph flow.
Fail if it claims a modern headless pass or user-agent spoof alone proves old-engine compatibility, or promises beta.3 behavior on beta.1.
@@ -1,85 +0,0 @@
# Focused Meteor test runs
Use two separate controls. Do not confuse test execution with module loading.
| Need | Control |
|---|---|
| Run selected registered tests | Driver filter such as `MOCHA_GREP`, or temporary Mocha `.only` |
| Prevent unrelated test modules from evaluating | `meteor.testModule` entrypoints and their import graph |
## Focus test execution
For an installed `meteortesting:mocha` version that supports it, set
`MOCHA_GREP` to a regular expression matching the full Mocha title:
```bash
MOCHA_GREP='items\.add.*rejects unauthenticated' \
meteor test --once --driver-package meteortesting:mocha
```
Use `MOCHA_INVERT=1` to exclude matching titles. Use `TEST_SERVER=0` or
`TEST_CLIENT=0` only when isolating one runtime side preserves what the test
proves. Inspect `.meteor/versions` and the
[`meteortesting:mocha` run options](https://github.com/Meteor-Community-Packages/meteor-mocha#run-tests-inclusively-grep-or-exclusively-invert)
before relying on package-specific behavior.
`describe.only` and `it.only` are temporary source-local alternatives. They do
not require `.only` on every ancestor, and they are incompatible with Mocha
parallel mode. Remove every focus marker before handoff and run the affected
suite. See [Mocha exclusive tests](https://mochajs.org/declaring/exclusive-tests/).
## Control the loaded test graph
Configure explicit entry modules when the project needs deterministic test
loading. `meteor.testModule` accepts one shared entry-module string or a runtime
map, usually `client` and `server`. Read those values from the project's
`package.json`; do not invent an entrypoint path. Each entry module imports the
tests for its runtime.
With `meteor.testModule`, Meteor eagerly loads only the configured entry module
for that runtime, then normal imports determine the remaining graph. Without
it, Meteor's filename patterns determine which test modules are eager.
`MOCHA_GREP` and `.only` filter registered test execution. They do not prevent
loaded modules from running module-scope code, declaring suites, or registering
hooks. Narrow an entrypoint's imports only when evidence shows module loading
itself causes interference or dominates the focused run. Preserve the original
imports, make the smallest temporary change, restore it immediately, and run
the normal affected suite. Never commit a narrowed test graph or a focus marker.
## Rspack architecture and ignore boundaries
Meteor 3.6-beta.3 with `rspack@1.4.0-beta360.3` and
`@meteorjs/rspack@3.0.0-beta.3` supports separate `testModule.legacy` and
exact `web.browser`, `web.browser.legacy`, `web.cordova` entries. Preserve the
matching app entries in `--full-app` mode. Enable legacy development/test
programs with `modern.webArchOnly: false` and do not exclude that architecture.
Use `meteor-modern-build-stack` for graph/config details.
A modern headless `meteor test --once` does not exercise the legacy test
program. Select it explicitly and check test names/counts for both programs.
A user-agent override tests delivery, not an old JS engine. Beta.0/beta.1
and older Rspack integrations lack this complete flow; retain their supported
test graph or select a compatible paired upgrade.
For beta.3 eager Rspack test selection, `.meteorignore` precedes user
`METEOR_IGNORE`; the last matching pattern wins. Keep parent directories
included before a file exception:
```bash
METEOR_IGNORE='**/*.tests.* !imports/accounts/*.tests.*' \
meteor test --once --driver-package meteortesting:mocha
```
This selects files, not test titles. `MOCHA_GREP` remains a separate control.
Generated Rspack exclusions are separate and scoped to the app root: a root
`test/` data directory must not hide `_build/test/`. User rules can still
incorrectly hide the handoff. Do not copy internal `METEOR_IGNORE_*` variables
into CI or ignore the active build context. For older integrations, use a
verified explicit entry/import graph when eager discovery is broken. Reject
zero tests when cases were expected, even if the process exits successfully.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/modules.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/environment-variables.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
@@ -1,77 +0,0 @@
# Meteor 3.5.2 and 3.6 beta testing boundaries
## Rspack full-app tests
Meteor 3.5.2 pairs `rspack@1.3.0` and `@meteorjs/rspack@2.2.0`. Its full-app
fixes preserve configured `meteor.mainModule` client and server bundles even
when `meteor.testModule` defines only server tests:
```bash
meteor test --full-app --once --driver-package meteortesting:mocha
```
The server module graph can use top-level `await`; awaited module dependencies
settle before their consumers and app tests run. Keep required initialization
in that awaited graph or an explicit awaited test setup. This does not imply
that detached Promises, timers, or every async `Meteor.startup` callback under
every driver finish before tests. Inspect the installed driver and verify the
specific readiness condition instead of adding a sleep.
A built client application bundle does not mean client tests executed. Use a
browser driver when testing browser behavior, and inspect both server and
client suite counts. Keep an existing application client entry for full-app
tests even when there is no client test entry. On earlier integrations,
reproduce and upgrade the paired release before relying on the 3.5.2 fixes.
## Zero tests under a parent `private` directory
`@meteorjs/rspack@2.2.0` fixes eager-test exclusion when an app's absolute
parent path contains `private`, for example a checkout at
`/workspace/private/my-app`. That parent segment is not the application's
private-assets folder. Earlier versions can silently discover zero tests there.
Check the app-relative filename pattern, `meteor.testModule`, ignore rules,
and expected suite count. Prefer upgrading; if an older release is fixed in
scope, moving a disposable checkout out of that parent path can isolate the
known regression. Do not remove the actual app `private/` asset exclusion.
## Package tests and the browser harness
`test-in-browser@1.6.0`, shipped with Meteor 3.5.2, removes transitive jQuery.
Its released Blaze test UI can still require jQuery even when the package's
own tests do not. Meteor 3.6-beta.0 restores the driver's client dependency in
`test-in-browser@1.6.1-beta360.0`. Inspect the resolved driver independently of
the Meteor release and distinguish a harness startup failure from a failed
application assertion.
If package tests themselves use jQuery, declare it in the existing
`Package.onTest` callback:
```javascript
Package.onTest((api) => {
// Keep the package's existing test dependencies and entrypoint.
api.use("jquery", "client");
});
```
Or supply it for the test invocation:
```bash
meteor test-packages --extra-packages=jquery ./packages/my-package
```
Use the actual local package path. On a branch pinned to driver 1.6.0, the
invocation-only extra package also works around the harness regression when
the tests themselves are jQuery-free. Prefer the fixed driver through a
compatible release when an upgrade is in scope. Do not add a production app
dependency to repair the test harness.
Earlier 1.5.x and the fixed 1.6.1 beta driver supply jQuery themselves; a
jQuery-free package does not need a new test dependency there. Tests that do
use jQuery should declare it explicitly regardless of transitive availability.
Confirm the browser UI loads and expected client and server assertions run;
an empty or crashed UI is not a passing test suite.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/about/modern-build-stack/rspack-bundler-integration.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/packages/7.writing-atmosphere-packages.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/generators/changelog/versions/3.6.0.md
@@ -1,100 +0,0 @@
# `meteortesting:mocha` setup
## Install
```bash
meteor add meteortesting:mocha
meteor npm install --save-dev @types/mocha
```
## Env vars
| Var | Purpose |
|------------------------|----------------------------------------------------------------------|
| `TEST_WATCH=1` | Re-run on file change. Use in dev. |
| `TEST_BROWSER_DRIVER` | Run client tests in a headless browser. `puppeteer`, `playwright`. |
| `TEST_SERVER=0` | Skip server tests. |
| `TEST_CLIENT=0` | Skip client tests. |
| `MOCHA_GREP` | Run titles matching a regular expression. |
| `MOCHA_INVERT=1` | Exclude titles matching `MOCHA_GREP`. |
| `MONGO_URL` | External Mongo for tests (e.g. `mongodb://localhost:27017/test`). |
These driver options depend on the installed `meteortesting:mocha` version.
Inspect `.meteor/versions`, then use
[`meteortesting:mocha`'s documented options](https://github.com/Meteor-Community-Packages/meteor-mocha#run-tests-inclusively-grep-or-exclusively-invert).
## Scripts
```json
{
"scripts": {
"test": "TEST_WATCH=1 meteor test --driver-package meteortesting:mocha",
"test:once": "meteor test --once --driver-package meteortesting:mocha",
"test:ci": "TEST_BROWSER_DRIVER=puppeteer meteor test --once --driver-package meteortesting:mocha",
"test:full": "meteor test --full-app --driver-package meteortesting:mocha"
}
}
```
`--once`: exit after the first run (CI). Without it, the runner stays
alive and re-runs on file change.
`--full-app`: runs the whole app plus tests. Use this when tests need to
hit live publications, methods, or HTTP endpoints over DDP. Server and
client tests both run; you can `DDP.connect(Meteor.absoluteUrl())` from a
test file.
## GitHub Actions example
```yaml
name: test
on: [pull_request]
jobs:
test:
runs-on: ubuntu-latest
services:
mongo:
image: mongo:7
ports: ["27017:27017"]
steps:
- uses: actions/checkout@v4
- uses: actions/setup-node@v4
with: { node-version: 22 }
- name: Install Meteor
run: curl https://install.meteor.com/ | sh
- run: meteor npm ci
- name: Run tests
run: |
TEST_BROWSER_DRIVER=puppeteer MONGO_URL=mongodb://localhost:27017/test \
meteor test --once --driver-package meteortesting:mocha
```
Node version must match the bundled Node.js for the Meteor version: 3.0 uses
Node 20, 3.1 through 3.4 use Node 22, and 3.5.x / 3.6-beta.0 use Node 24.
Meteor 3.6-beta.1 through beta.3 use Node 26.8.2 and npm 11.19.0. The example above targets
3.1-3.4; adjust its Node selection for the actual job. Run `meteor node -v`
and `meteor npm -v` in the target app, rebuild native dependencies for that
runtime, and keep dependency installation frozen in CI.
## Test discovery
- Normal test mode: `*.test[s].*` and `*.spec[s].*` outside ignored
`tests/` directories.
- Full-app mode: `*.app-test[s].*` and `*.app-spec[s].*` outside ignored
`tests/` directories.
- Every `tests/` directory is ignored by Meteor's build tool. Reserve it for
an external test runner.
Server-only modules stay server-only when imported from tests. Client
tests run in a browser instance the driver spawns.
For focused execution and the separate `meteor.testModule` loading boundary,
read [Focused Meteor test runs](focused-runs.md).
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/tutorials/testing/testing.md
-99
View File
@@ -1,99 +0,0 @@
---
name: meteor-typescript
description: >
Use when setting up or repairing Meteor application declarations, TypeScript
configuration, JavaScript IntelliSense, or local and CI type-checking.
Triggers on meteor types, meteor/* imports resolving to any, missing
declarations, duplicate Meteor identifiers, zodern:types, @types/meteor,
.meteor/types, tsconfig.json, jsconfig.json, and tsc --noEmit in a Meteor app.
Use this skill when choosing or migrating declaration providers without
changing the app's runtime or bundler. For a Meteor 2-to-3 runtime migration
use migrate-to-meteor-3 first; for SWC/Rspack compilation use
meteor-modern-build-stack or migrate-to-rspack. General TypeScript language
questions and Atmosphere declaration publishing are outside this app scope.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: build
tagline: "Configure Meteor app declarations, TypeScript and JavaScript IntelliSense, and reliable local/CI type-checking."
docs_synced_at: "2026-09-29"
license: MIT
---
# TypeScript in Meteor applications
Make the editor and checker resolve the intended Meteor declarations and
actually inspect application source. Preserve working provider choices unless
the task includes changing them. A runtime or bundler upgrade does not imply
a declaration migration.
For a runtime migration or bundler configuration request, load the owning
skill before proposing migration steps or build configuration. This skill's
declaration guidance does not supply that procedure; do not substitute a
generic TypeScript/Rspack recipe when the owning skill is unavailable.
## Identify the layer
| Layer | Evidence and action |
|---|---|
| Compilation | The Atmosphere `typescript` package or Rspack/SWC strips types. Use the build owner for syntax transforms, loaders and bundling. |
| Declaration provider | Inspect `.meteor/packages`, `.meteor/versions`, npm/workspace manifests and lockfile for direct `zodern:types`, `@types/meteor` and native opt-in. |
| Resolution | Inspect active `tsconfig.json`/`jsconfig.json`, `extends`, `files`, `include`, `exclude`, `paths` and `types`. Check the editor uses the intended project/compiler. |
| Checking | Inspect the installed npm `typescript` and scripts; it is separate from the Atmosphere compiler. Preserve a configured checker such as `TsCheckerRspackPlugin`. |
Do not infer that an app is checked because `meteor run` or `meteor build`
succeeded. Conversely, do not claim an explicitly configured checker never
runs just because SWC itself only transpiles.
## Choose the provider
Native declarations start with 3.6-beta.1; this workflow is verified through
3.6-beta.3. Beta.3 adds the declaration corrections linked below.
| Target and intent | Decision |
|---|---|
| Meteor 3 before 3.6-beta.1 | Native `meteor types` is unavailable. Keep a working legacy provider; use the earlier-release branch in the provider reference if declarations are missing. |
| New or existing 3.6 native-types-capable app with working legacy types | Keep them unless native adoption is requested. Beta.1 TypeScript templates still install direct `zodern:types` and `@types/meteor`; a native fallback path is not opt-in. |
| Explicit native adoption on 3.6-beta.1 through beta.3 | Root config required. Checkpoint providers/config, remove direct `zodern:types`, generate successfully, then merge native resolution and remove overlapping ambient types. |
| JavaScript-only 3.6 beta app wanting IntelliSense | Use `jsconfig.json` and the same provider decision; no TypeScript source conversion or bundler switch is required. |
Read [declaration providers](references/declaration-providers.md) for the
ordered switch, native adapter/barrel distinction, inherited configuration,
TypeScript 7 compatibility, earlier providers and rollback. Read
[JavaScript IntelliSense](references/javascript-intellisense.md) for JS apps.
## Verify the effective project
1. Confirm generation actually ran. A direct `zodern:types` makes
`meteor types` skip with exit zero; ordinary Meteor commands do not select
or regenerate native declarations on beta.1 through beta.3.
2. Use the app's local compiler. With native declarations, run
`meteor types && tsc --noEmit` in a package script; select the intended
config explicitly when the app has several projects.
3. Check `tsc --listFiles --noEmit` includes application source. Appending a
barrel under `files` can disable implicit inclusion; retain existing source
patterns and exclusions. A deliberate temporary wrong type should fail;
remove the probe and rerun. JavaScript IntelliSense alone does not enable
`checkJs`; select JS checking separately when requested.
4. Restart the editor's TypeScript server after configuration changes. If
CLI and editor disagree, compare selected config/compiler before clearing
Meteor state or reinstalling providers.
5. Keep generated `.meteor/types/` untracked and unedited. Fix exposed app
errors rather than masking them with `any` or a new `skipLibCheck` bypass.
## Diagnose the boundary
| Symptom | First check |
|---|---|
| Native command reports nothing to do | Root `tsconfig.json` or `jsconfig.json`. For a new native-only setup, generate with the root config before adding entries that point to nonexistent output. |
| Generation fails | Read the error; local packages may need fixing. Stop the provider switch, preserve config and old output, restore the previous provider for rollback. |
| Ordinary imports work, scoped/sub-path imports fail | Explicit native barrel in `files` plus wildcard mapping to per-package adapters, not to the barrel. |
| Duplicate identifiers | Overlapping providers, inherited `types: ["meteor"]` and app ambient declarations before symlinks. |
| Peer types fail inside Meteor's package store | Consider `preserveSymlinks` for that specific boundary; it cannot remove duplicate providers. |
| One community package remains untyped | Check whether the installed package publishes declarations. No generator can promise coverage for every Atmosphere package. |
| Generated relative imports or subscription handle types disagree with runtime | Check the beta.3 declaration corrections in [provider guidance](references/declaration-providers.md#compiler-configuration-compatibility), then regenerate and type-check. Keep generated files unedited and structural handles usable. |
If the actual task is publishing package declarations, use the official
[Atmosphere package types documentation](https://docs.meteor.com/packages/7.writing-atmosphere-packages#typescript-types).
Do not edit generated application adapters as a package-authoring solution.
@@ -1,161 +0,0 @@
# Meteor declaration providers
Inspect the release, direct Atmosphere constraints, resolved package versions,
npm/workspace manifests, lockfile and all active TypeScript configs before
changing providers. Keep compiler upgrades separate from declaration changes.
## Choose by release and provider
| Project state | Action |
|---|---|
| Meteor 3 before 3.6-beta.1 | Native `meteor types` is unavailable. Retain working legacy declarations; use the `zodern:types` branch below when package declarations are missing. |
| Upgrading to 3.6-beta.1 with working `@types/meteor` or `zodern:types` | Keep the provider and paths unless the task includes adopting native declarations. Runtime upgrade alone does not switch providers. |
| Explicit native adoption on 3.6-beta.1 | Follow the ordered migration below. The command needs a root `tsconfig.json` or `jsconfig.json`. |
| Direct `zodern:types` still installed | `meteor types` skips successfully and leaves both output trees unchanged. A zero exit is not proof of native generation. A transitive dependency alone does not select the legacy provider. |
The classic `typescript` package and Rspack/SWC transpile app source without
type-checking it themselves. A separately configured checker, such as the
TypeScript scaffold's `TsCheckerRspackPlugin`, is a distinct layer; preserve
a working checker when changing declarations. On beta.1, ordinary `run`, `build`, `test` and `lint` neither
generate nor select native declarations. New TypeScript templates also keep
the legacy provider first; a native fallback path is not an opt-in.
## Native adoption on Meteor 3.6-beta.1
1. Checkpoint provider dependencies, lockfile and TypeScript configuration.
Keep the app's local TypeScript compiler version fixed during this change.
2. Remove `zodern:types` only if it is a direct app dependency, then generate:
```bash
meteor remove zodern:types
meteor types
```
Generation can build local packages but does not bundle or type-check the
application. On failure, stop before changing provider paths: the command
exits nonzero and preserves the old `.meteor/local/types` output. Restore
the removed provider if rolling back. Successful generation removes that
stale legacy output.
3. After success, merge these entries into the active TypeScript config:
```json
{
"files": ["./.meteor/types/packages.d.ts"],
"include": ["**/*.ts", "**/*.tsx"],
"compilerOptions": {
"paths": {
"meteor/*": ["./.meteor/types/packages/*"]
}
}
}
```
Append the barrel to existing `files`; retain existing `include`, aliases,
compiler options and `extends`. If the app previously had neither `files`
nor `include`, adding `files` disables implicit source inclusion: explicitly
preserve it with `include: ["**/*"]`, or the app's intended source patterns.
Do not broaden an intentionally files-only project. Resolve paths against the config
that declares them. The adapters resolve normal package imports; the barrel
supplies scoped and sub-path modules such as
`meteor/react-meteor-data/suspense`. Explicit `files` works even when
`.meteor/**` is excluded. Do not map `meteor/*` directly to the native barrel.
4. Remove a direct `@types/meteor` dependency with the project's existing
package manager, and remove only `"meteor"` from `compilerOptions.types`
wherever it is inherited or declared. Preserve other type libraries and
the workspace lockfile. Prefer one provider per Meteor module ID; a hybrid
for uncovered packages needs deliberate non-overlap and type-checking.
5. Use the app's installed `typescript` compiler, adding a compatible pinned
dev dependency only if missing. For an npm app:
```json
{
"scripts": {
"check-types": "meteor types && tsc --noEmit"
}
}
```
```bash
meteor npm run check-types
```
Use the equivalent script runner for pnpm/Yarn. CI must generate before
invoking local `tsc`; a successful app build does not prove type safety.
Fix errors exposed by corrected declarations without casting everything
to `any`. Check `tsc --listFiles --noEmit` includes application source; a
deliberate temporary wrong type should fail. Remove that probe and rerun.
Restart the editor's TypeScript server after config changes.
Do not edit or commit `.meteor/types/`; generation replaces its contents and
writes its own `.gitignore`. Roll back by restoring legacy dependencies,
lockfile and config, then regenerate using the app's previous provider workflow.
Ordinary Meteor commands and a skipped native run do not delete either tree.
## Compiler configuration compatibility
For Meteor 3.6, the workflow above is verified through beta.3. Keep native
generation explicit; working legacy providers remain valid. After a paired
tool/package upgrade, rerun `meteor types` before checking the app.
If reaching beta.3 requires changing the framework release, use
`meteor-cli-installation` for retained local-data preparation before that
release starts; declaration regeneration is not a database migration.
| Native declaration symptom | Beta.3 verification and earlier-version boundary |
|---|---|
| Relative imports/re-exports or ambient declarations break inside a generated package | Beta.3's generator preserves the declaration tree and ambient entry location and parses module structure. Beta.1 lacks these layout fixes. Inspect the package's shipped files, regenerate with the fixed tool and run the local checker; do not flatten or patch `.meteor/types`. A package that did not ship its referenced file still needs a package fix. |
| DDP imports or subscription handles disagree with runtime | Beta.3's `ddp-client`, `ddp-common`, `meteor` and `minimongo` declarations are corrected. Match resolved package versions and regenerate. Real `Meteor.subscribe` / DDP handles return `SubscriptionHandleWithId`; structural `Meteor.SubscriptionHandle` still requires only `ready()` and `stop()`. Do not require synthetic adapters to invent `subscriptionId`, or loosen all handles to `any`. |
These are declaration corrections, not new runtime methods. Internal Minimongo
helper declarations do not make those helpers a recommended public app API.
Keep earlier native/legacy setups when the app cannot change its release;
do not promise beta.3 declaration fixes on beta.1 or force a provider switch.
Inspect the installed npm `typescript`, not only the Atmosphere `typescript`
package: they are separate tools. Beta.1's TypeScript scaffold selects npm
TypeScript 7 and `moduleResolution: "bundler"`. Do not copy older docs'
`baseUrl` or `moduleResolution: "node"` into it.
[TypeScript 7 removes both options](https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/).
`paths` works without `baseUrl` on TypeScript 4.1+; use explicit relative
targets, preserving aliases and their previous base directory. Keep an older
app's compatible compiler/configuration rather than upgrading its compiler
just to change Meteor declarations.
## Earlier-release legacy declarations
If required package declarations are missing on an older Meteor 3 app:
```bash
meteor add zodern:types
```
Merge the legacy settings, preserving any intentional working provider order:
```json
{
"compilerOptions": {
"preserveSymlinks": true,
"paths": {
"meteor/*": ["./.meteor/local/types/packages.d.ts"]
}
}
}
```
Regenerate through the existing provider workflow, restart the editor's
TypeScript server, and run the local compiler. Keep generated output untracked.
The legacy barrel mapping is not the native adapter mapping.
## Diagnose the first missing boundary
| Symptom | Check |
|---|---|
| `meteor types` reports nothing to do | Root `tsconfig.json` or `jsconfig.json`; do not delete caches. |
| Generation says it skipped | Direct `zodern:types` constraint, not only `.meteor/versions`. |
| Ordinary imports work but scoped/sub-path imports fail | Explicit native barrel in `files`, not just wildcard `paths`. |
| Duplicate identifiers after switching | Overlapping providers, inherited `types: ["meteor"]`, old paths and ambient declarations before blaming symlinks. |
| Bundled npm peer types fail under the package store or degrade to `any` | Try `compilerOptions.preserveSymlinks: true` for that resolution boundary. This does not fix overlapping declaration providers. |
| One community module has no native adapter | The package may publish no type information. Inspect its version and metadata; do not invent generated declarations or claim all Atmosphere packages are covered. |
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/typescript/meteor-types.md
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/using-core-types.md
@@ -1,135 +0,0 @@
# TypeScript acceptance cases
Use the current skill and relevant references in a fresh conversation or a
disposable app. Keep pass/fail criteria hidden until the run finishes.
## Case 1: native provider adoption in a beta.1 app
Prompt: "Our Meteor 3.6-beta.1 TypeScript app was just created, and we explicitly want native declarations. We have direct zodern:types and @types/meteor, tsconfig extends, a files array and meteor in compilerOptions.types. Give the migration and CI sequence."
Pass if the agent: Preserves the compiler and app config, checkpoints state, removes direct zodern:types, generates before switching paths/removing @types/meteor, appends the native barrel and per-package adapters, removes only inherited meteor ambient loading, runs local tsc through a script and keeps generated files untracked. Provides rollback without treating compilation as checking.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 2: preserve providers during runtime upgrade
Prompt: "Upgrade our existing Meteor app to 3.6-beta.1 but keep the working TypeScript provider. meteor types exits zero saying zodern:types is installed. Did it generate native types, and should we remove the provider?"
Pass if the agent: Keeps the explicit existing-provider preference, explains successful skip and direct dependency precedence, and distinguishes runtime upgrade, native generation and type-checking. Does not remove working providers.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 3: native generation failure
Prompt: "After removing direct zodern:types on 3.6-beta.1, meteor types fails. Should we replace paths, uninstall @types/meteor and delete .meteor/local/types to finish?"
Pass if the agent: Stops provider switching until generation succeeds, preserves old output and config, restores the removed package for rollback and reports nonzero generation failure. Does not delete fallback output or invoke a destructive reset.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 4: native scoped imports and mixed providers
Prompt: "After beta.1 native opt-in, meteor/random resolves but meteor/react-meteor-data/suspense fails. Our tsconfig excludes .meteor and extends a config with types [meteor,node]. Why do we also see duplicate declarations?"
Pass if the agent: Checks explicit native barrel in files despite exclude, keeps paths mapped to packages/* rather than the barrel, checks installed package declaration coverage and removes overlapping ambient meteor provider while preserving node and unrelated config. Does not blame all failures on preserveSymlinks.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 5: TypeScript 7 configuration during native adoption
Prompt: "After selecting Meteor 3.6-beta.1 native declarations, our existing TypeScript 7 app reports TS5102 for baseUrl copied from the guide. Should we downgrade TypeScript or copy moduleResolution: node as well? The Rspack config already has TsCheckerRspackPlugin."
Pass if the agent preserves the compiler and checker, removes the unsupported
baseUrl while preserving alias semantics through relative paths, keeps a
compatible bundler/nodenext resolution mode, and separates checker behavior
from SWC transpilation and native generation. It must not downgrade TypeScript
or claim the configured checker does not run just because SWC itself strips types.
## Case 6: generated barrel hides application source
Prompt: "After beta.1 native opt-in we added files: [.meteor/types/packages.d.ts] to a tsconfig that previously had neither files nor include. tsc now passes even with a wrong assignment in imports/probe.ts. Are native types working?"
Pass if the agent checks the effective source set with local tsc --listFiles,
explains that adding files removed implicit inclusion, and preserves the
previous source set with explicit include patterns while retaining exclusions.
It verifies a temporary deliberate type error fails, then removes it and
reruns. It must not disable checks or claim a green exit proved app coverage.
## Case 7: Meteor TypeScript imports become `any`
Prompt: "After moving from Meteor 2 to Meteor 3.5.2, required package
declarations are missing. We want zodern:types; the editor also reports
duplicate identifiers. What should we inspect and configure?"
Pass if the agent checks existing providers and inherited configuration, uses
the legacy `zodern:types` workflow with `preserveSymlinks` and the legacy barrel
mapping, and restarts the TypeScript server. It must inspect overlapping
declarations before attributing duplicates to symlinks, keep generated output
untracked, and not prescribe native `meteor types` on 3.5.2.
## Case 8: JavaScript IntelliSense without conversion
Prompt: "Our JavaScript-only Meteor 3.6-beta.1 app wants IntelliSense for meteor/random. There is no root tsconfig or jsconfig and no direct zodern:types. We do not want a TypeScript conversion, a bundler change or JS lint errors."
Pass if the agent adds a root jsconfig, generates native declarations before
selecting their paths, includes native adapters/barrel and intended JS source,
preserves compatible resolution and verifies editor types. It keeps checkJs
and CI error checking optional and does not convert source or add Rspack.
## Case 9: missing root configuration
Prompt: "On 3.6-beta.1, meteor types says there is nothing to do. We only have tsconfig files under imports/ui and packages. Should we delete .meteor/local or run meteor reset?"
Pass if the agent checks for an appropriate root config, preserves nested
project ownership, reruns generation, and checks real output. It does not
reset application state or assume a successful no-op generated declarations.
## Case 10: a package is missing from native output
Prompt: "Native types work for meteor/random but a community package is untyped and has no generated adapter. Another declared package has TS2307 for a bundled peer under the Meteor package store. Should we edit .meteor/types or enable preserveSymlinks for everything?"
Pass if the agent separates missing declaration metadata from peer resolution,
checks installed package/version metadata, tries preserveSymlinks only for the
peer boundary, and does not edit generated files or promise universal coverage.
Any hybrid provider is deliberate, non-overlapping and checked.
## Case 11: bundler configuration near miss
Prompt: "Configure SWC decorators and CSS loaders in rspack.config.ts for our Meteor app. Existing editor types and type-checks already work."
Pass if the agent routes bundler configuration to meteor-modern-build-stack
and leaves working providers alone. The config's .ts suffix alone does not
make declarations the primary task.
Fail if it supplies a generic Rspack configuration without consulting the
Meteor build owner and release pairing.
## Case 12: runtime migration near miss
Prompt: "Move this Meteor 2 app to Meteor 3, replacing removed Fibers and propagating async Mongo calls through methods. We use TypeScript but are not changing providers."
Pass if the agent selects migrate-to-meteor-3 for runtime/API conversion and
preserves the working declaration provider. It does not replace that task
with native type setup.
Fail if it invents a runtime procedure under this skill, including flipping
the release before async conversion and package triage.
## Case 13: package-author boundary
Prompt: "Publish declarations for my reusable Atmosphere package with api.types and package-types.json. Is editing the app's generated adapter the right workflow?"
Pass if the agent rejects editing generated adapters and directs the actual
package-author workflow to the official Atmosphere types documentation. It
does not claim the app-provider skill implements package publication or that
api.types exists on every Meteor 3 release.
## Case 14: Native declaration layout recovery
Prompt: "Our beta.1 native generated declarations lose a package relative import and nested ambient declaration path. The package ships those files. We can update to beta.3. Should we flatten or edit .meteor/types?"
Pass if the agent checks exact tool/packages, uses beta.3 layout corrections then explicit meteor types and local compiler/source inclusion checks, preserving provider config and unedited generated files.
Fail if it patches generated files, adds any/skipLibCheck to hide errors, or promises the generator recreates unshipped files.
## Case 15: Structural subscription handles
Prompt: "On beta.3 native declarations we read subscriptionId from Meteor.subscribe and DDP.connect(...).subscribe. Our wrapper returns only ready and stop and is typed Meteor.SubscriptionHandle. Must we invent an ID for it?"
Pass if the agent distinguishes concrete SubscriptionHandleWithId returns from structural SubscriptionHandle, keeps wrapper valid without synthetic IDs, checks resolved declarations/regeneration and notes older providers may differ.
Fail if it makes subscriptionId mandatory for all structural handles, uses any or treats type corrections as new runtime APIs.
@@ -1,59 +0,0 @@
# JavaScript IntelliSense
Native Meteor-import declarations require Meteor 3.6-beta.1 or later; on an
earlier Meteor 3 app retain the existing legacy declarations. A JS app does
not need a TypeScript conversion or Rspack migration to obtain editor types.
Inspect the existing provider and root config first. If `tsconfig.json`
already owns these files, configure that project instead of creating a
competing `jsconfig.json`. Otherwise create or merge a root `jsconfig.json`,
retaining the app's source patterns, aliases, resolver and exclusions.
For beta.1 native opt-in, follow the generation-before-switch and rollback
sequence in [declaration providers](declaration-providers.md). The root config
must exist before `meteor types`; a direct `zodern:types` still causes a
successful skip. Once generation succeeds, merge:
```json
{
"files": ["./.meteor/types/packages.d.ts"],
"include": ["**/*.js", "**/*.jsx"],
"compilerOptions": {
"paths": {
"meteor/*": ["./.meteor/types/packages/*"]
}
}
}
```
Append the barrel to existing `files`; preserve intentional JS/JSX source
inclusion and generated-output exclusions. The barrel is explicit even when
`.meteor/**` is excluded. Use relative `paths` targets; do not copy removed
TypeScript 7 `baseUrl` or `moduleResolution: "node"` options from older
examples. Retain a compatible resolver already used by the editor/project.
Remove overlapping direct `@types/meteor` and only the `meteor` entry from
inherited `compilerOptions.types` after successful generation. Restart the
editor's TypeScript server and check hover/completion for a public import
such as `meteor/random`, plus a used scoped/sub-path import when relevant.
If a package supplies no declarations, do not claim generation typed it.
`jsconfig.json` provides a JavaScript project for editor services; enabling
native declarations does not automatically enable JS error checking. If the
user also wants CI checks, use the app's compatible local TypeScript compiler
and opt into `checkJs` deliberately:
```json
{
"scripts": {
"check-js": "meteor types && tsc --project jsconfig.json --allowJs --checkJs --noEmit"
}
}
```
Verify the intended JS source appears in the compiler's file list and a
temporary invalid assignment is rejected. Keep this optional check separate
from a request for IntelliSense only. Do not edit or commit generated types.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/docs/cli/using-core-types.md
-149
View File
@@ -1,149 +0,0 @@
---
name: migrate-to-meteor-3
description: >
Use when migrating a Meteor 2.x application to Meteor 3.x. Triggers on
callAsync, *Async Mongo, removed Fibers, implicit-global ReferenceError,
lost Blaze reactivity, a publish function returning a Promise, a scheduler
dropping a Promise, a read API receiving update modifiers, async allow/deny,
an Iron Router controller not running, "Method stub took too long",
Atmosphere resolution, Express 5 WebApp handlers, lost async context,
rawCollection callbacks, TypeScript declaration failures during upgrades, useTracker, and
useSubscribe. Use this skill when the user asks about upgrading Meteor,
async caller propagation, iterators with await, or replacing and forking
packages. Standalone declarations and type-checking belong to meteor-typescript.
metadata:
author: meteor
kind: knowledge
meteor: ">=3.0"
area: migration
tagline: "Migrate a Meteor 2.x app to 3.x (`callAsync`, async Mongo, Fibers removal, Blaze reactivity, Express 5, Atmosphere resolution)."
bundle: ["migration"]
docs_synced_at: "2026-09-23"
license: MIT
---
# Migrate a Meteor 2.x application to Meteor 3.x
Meteor 3 removed Fibers. Server-side Mongo APIs are async. The module system
enforces strict mode. Client reactivity inside async code needs care.
Atmosphere packages often need forking or replacement. Approach the migration
in phases. Do not flip the framework version flag first.
## Recommended strategy
1. Update the project to the latest 2.x release.
2. Run the app with `WARN_WHEN_USING_OLD_API=true meteor run`. The console
logs every sync-API call that needs an async sibling, giving you a
to-do list before the framework flip.
3. Migrate server-side sync Mongo calls to `*Async` siblings while still
on 2.x. Trace each changed function through every server-side caller:
await where the caller consumes the value, forward Promises deliberately,
and restructure sync-only boundaries. Stop only at an async-capable
framework boundary. See `references/async-rewrites.md` and
`references/call-vs-callAsync.md`. A community jscodeshift codemod automates
the easy cases, but it misses non-standard collection imports (for example,
`meteor/<publisher>:collections`). Review the diff by hand, then audit
callback Promise ownership and collection argument shapes.
4. Audit Atmosphere packages. Find replacements or fork outdated ones;
pin `api.versionsFrom(['2.x', '3.0'])`. See
`references/package-triage.md`. Save `.meteor/versions` and npm lockfile
checkpoints so package-major changes remain distinguishable from Meteor.
5. Upgrade to Meteor 3.x.
6. Sweep implicit globals; rewrite to `const` or `export` / `import`.
See `references/module-system.md`.
7. Audit Blaze helpers and `Tracker.autorun` blocks for lost reactivity
after `await`. See `references/client-reactivity.md`.
8. Replace iterators that contain `await` (`forEach`, `map`, `filter`)
with `for...of` or `Promise.all`. See `references/js-iterators.md`.
9. Audit publications using internal cursor APIs (`_cursorDescription`,
manual `sub.added`) and framework handlers that read invocation `this`.
Both synchronous and async publish handlers may return cursors; keep cursor
transforms synchronous and use ordinary functions when Meteor must bind
`this`. When a package patches `Meteor.publish` with an
`EnvironmentVariable`, scope `publish.call` at the wrapper's top level,
not inside the invoked handler. Verify invocation context before and after
`await`. See `references/publications.md` and
`references/other-breaking-changes.md`.
10. For TypeScript projects, inspect the target release and existing declaration
provider. Keep working `@types/meteor` or `zodern:types` setups. Meteor
3.6-beta.1 adds explicit native opt-in through `meteor types`; earlier
releases retain the legacy workflow. See
`references/typescript-migration.md`, then use `meteor-typescript` for
provider changes and checking.
11. For React projects, decide whether to adopt the Suspense-aware
`react-meteor-data` import. See `references/react-migration.md`, then use
`meteor-react` for current hook, scaffold, and build guidance.
## Symptom router
| Symptom | Reference |
|------------------------------------------------------|----------------------------------------|
| `TypeError: Collection.findOne is not a function` | `references/async-rewrites.md` |
| `Method returns undefined` or returns a `Promise` | `references/async-rewrites.md` |
| Downstream caller receives or reads from a `Promise` | `references/async-rewrites.md` |
| Cron, hook, timer, or event callback drops a Promise | `references/async-rewrites.md` |
| Read method receives `$set`, `$push`, or another modifier | `references/async-rewrites.md` |
| `allow` / `deny` validator needs an async database read | `references/async-rewrites.md` |
| `Meteor.call` callback never fires | `references/call-vs-callAsync.md` |
| `ReferenceError: X is not defined` at startup | `references/module-system.md` |
| Template renders, no data, Minimongo empty | `references/module-system.md` |
| Iron Router controller silently does not run | `references/module-system.md` |
| `{{> partial}}` renders nothing in Blaze | `references/module-system.md` |
| Page renders but live data never updates | `references/client-reactivity.md` |
| Blaze helper returns a `Promise` | `references/client-reactivity.md` |
| Cursor `transform` errors with "returned a Promise" | `references/publications.md` |
| `sub.added` writes never reach the client | `references/publications.md` |
| Method or publication loses `this.userId` | `references/publications.md` |
| Atmosphere package fails to resolve or build | `references/package-triage.md` |
| `forEach`/`map`/`filter` with `await` skips items | `references/js-iterators.md` |
| Middleware on `WebApp.connectHandlers` not firing | `references/webapp-express.md` |
| Route uses an unnamed wildcard after Meteor 3.1 | `references/webapp-express.md` |
| `rawCollection` callback never fires | `references/other-breaking-changes.md` |
| Patched publication loses `Meteor.userId()` or async context | `references/other-breaking-changes.md` |
| `meteor reset` did not wipe the local Mongo | `references/other-breaking-changes.md` |
| `Method stub (X) took too long` console warning | `references/call-vs-callAsync.md` |
| "Cannot enlarge memory array" during `meteor update` | `references/other-breaking-changes.md` |
| External callback lost `this.userId` or env vars | `references/other-breaking-changes.md` |
| Monkey-patched `Meteor.publish` never runs | `references/other-breaking-changes.md` |
| `meteor/*` imports resolve to `any` in TypeScript | `references/typescript-migration.md` |
| `useTracker` or `useSubscribe` not re-running | `references/react-migration.md` |
## Anti-patterns
- Do not run `meteor update --release=3` first. Async-convert and
package-triage on 2.x first.
- Do not global-replace `findOne` with `findOneAsync`. Many callers need
rewriting, not just `await`.
- Do not mechanically rewrite client Minimongo calls to async. Both APIs work
on the client. Prefer sync calls in naturally synchronous Blaze and Tracker
code; use async calls in shared or already-async flows. Wrap reactive reads
after an `await` with `Tracker.withComputation`.
- Do not rely on Iron Router controller naming-convention lookup. Pass
`controller:` explicitly on every route.
- Do not mix `await` and `.then()` in the same function. Pick one.
- Do not assume implicit globals work. Every top-level identifier in 3.x
must be `const`, `let`, or `export`-ed.
- Do not invent async replacements. `Meteor.userId()` remains synchronous
inside methods and publications; there is no `Meteor.userIdAsync()`.
- Do not use an arrow as a method or publication handler when it reads
framework-bound `this`. An arrow ignores the invocation context Meteor
supplies.
- Do not rewrite `api.addFiles` or `api.export` only because the app moved to
Meteor 3. They remain supported for Atmosphere packages.
## See also
- Async: `async-rewrites.md`, `call-vs-callAsync.md`, `async-cheatsheet.md`,
`js-iterators.md`, `removed-functions.md`.
- Runtime: `module-system.md`, `client-reactivity.md`, `publications.md`,
`webapp-express.md`, `other-breaking-changes.md`.
- Project: `package-triage.md`, `typescript-migration.md`,
`react-migration.md`, `eval-cases.md`.
- Current Meteor React integration after the upgrade: `meteor-react`.
## Further reading (optional)
Real-world migration write-ups for context, not for fixing specific
issues. The symptom router above is sufficient on its own. Open
`references/community-case-studies.md` only when the user asks for
narrative case studies or wants to calibrate effort and timeline.
@@ -1,32 +0,0 @@
# Async cheatsheet
Quick lookup for the sync-to-async rewrite Meteor 3 requires on the server.
| Surface | Sync (2.x, server) | Async (3.x, server) |
|------------------------|---------------------------------|-----------------------------------------|
| Mongo read | `c.find(q).fetch()` | `await c.find(q).fetchAsync()` |
| Mongo single read | `c.findOne(q)` | `await c.findOneAsync(q)` |
| Mongo write | `c.insert(d)` | `await c.insertAsync(d)` |
| Mongo update | `c.update(q, m)` | `await c.updateAsync(q, m)` |
| Mongo delete | `c.remove(q)` | `await c.removeAsync(q)` |
| Mongo upsert | `c.upsert(q, m)` | `await c.upsertAsync(q, m)` |
| Cursor enumeration | `cursor.forEach(fn)` | `await cursor.forEachAsync(fn)` |
| Cursor count | `cursor.count()` | `await cursor.countAsync()` |
| Cursor map | `cursor.map(fn)` | `await cursor.mapAsync(fn)` |
| RPC | `Meteor.call('m', ...args, cb)` | `await Meteor.callAsync('m', ...args)` |
| RPC with options | `Meteor.apply(...)` | `await Meteor.applyAsync(...)` |
| User identity (server) | `Meteor.user()` | `await Meteor.userAsync()` |
| Accounts create (server) | `Accounts.createUser(o)` | `await Accounts.createUserAsync(o)` |
| Accounts password set | `Accounts.setPassword(...)` | `await Accounts.setPasswordAsync(...)` |
| Accounts add email | `Accounts.addEmail(uid, addr)` | `await Accounts.addEmailAsync(uid, addr)` |
| Email | `Email.send(opts)` | `await Email.sendAsync(opts)` |
| Mongo index | `Collection._ensureIndex(spec)` | `await Collection.createIndexAsync(spec)` |
| Asset, text | `Assets.getText(path)` | `await Assets.getTextAsync(path)` |
| Asset, binary | `Assets.getBinary(path)` | `await Assets.getBinaryAsync(path)` |
Client Minimongo keeps its synchronous API. Client RPC may still move from a
callback to `callAsync`, and `Accounts.createUserAsync` is available, but the
callback-shaped client Accounts APIs were not removed.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/migrating-to-async-in-v2/index.md
@@ -1,224 +0,0 @@
# Sync-to-async rewrite mechanics
Meteor 3 removed the synchronous Mongo API on the server. Replace each sync
Mongo call with its `*Async` sibling. Every caller that consumes the resulting
value must await it. A function that only returns the Promise can forward it
without adding `async` or `await`. Promise handling propagates up the call stack
until it reaches a method, publication, middleware, or another async-capable
framework boundary.
## Decision flow
1. Rewrite the leaf server API to its `*Async` sibling.
2. Find every caller of the changed function, including indirect callers.
3. Caller consumes the resolved value: mark it `async` and add `await`.
4. Caller only returns the Promise: return it directly; `return await` is not
required unless local error handling needs it.
5. Caller is a synchronous-only boundary: restructure it around an async
factory, preloaded value, or an async-capable outer boundary.
6. Continue until all paths reach a framework boundary that accepts Promises.
7. Client-side Minimongo supports both sync and async APIs. Keep sync calls
when they simplify naturally synchronous reactive UI code. Use async calls
in shared or already-async flows; reactive reads after an `await` require
`Tracker.withComputation`. See `client-reactivity.md`.
8. Inside a method or publication, prefer `this.userId` over
`Meteor.userId()`. The async server context can lose the implicit user.
## Propagate through the caller chain
Before migration, each caller receives a resolved value synchronously:
```javascript
function findOrder(id) {
return Orders.findOne(id);
}
function calculateTotal(id) {
const order = findOrder(id);
return order.lines.reduce((total, line) => total + line.amount, 0);
}
function buildInvoice(id) {
return { orderId: id, total: calculateTotal(id) };
}
Meteor.methods({
createInvoice(id) {
return buildInvoice(id);
},
});
```
After converting the leaf API, propagate Promise handling through every caller
that consumes the result:
```javascript
function findOrder(id) {
return Orders.findOneAsync(id);
}
async function calculateTotal(id) {
const order = await findOrder(id);
return order.lines.reduce((total, line) => total + line.amount, 0);
}
async function buildInvoice(id) {
const total = await calculateTotal(id);
return { orderId: id, total };
}
Meteor.methods({
async createInvoice(id) {
return buildInvoice(id);
},
});
```
`findOrder` only forwards the Promise, so it does not need the `async` keyword.
The next two functions inspect resolved values, so both must be async and await
their callees. The method is the framework boundary and can return the final
Promise. When independent calls exist at one level, use `Promise.all` instead
of introducing unnecessary sequential waits.
## Synchronous-only boundaries
Constructors cannot be async. Move loading into an async factory and keep the
constructor synchronous:
```javascript
class Invoice {
constructor(order) {
this.order = order;
}
static async create(orderId) {
const order = await Orders.findOneAsync(orderId);
return new Invoice(order);
}
}
const invoice = await Invoice.create(orderId);
```
Apply the same rule to callbacks. Audit timers, event emitters, streams, cron
and queue libraries, hooks, observers, middleware, and package callbacks.
Confirm from source or documentation whether the owner awaits a returned
Promise. If it does not, handle rejection inside the callback or bridge the work
to an awaited application lifecycle. Treat `void task().catch(report)` as
intentional fire-and-forget only when the failure policy is explicit. Force one
controlled rejection at each critical boundary to verify its behavior.
## Audit operation semantics after codemods
Do not validate a mechanical rewrite only by checking that the new method ends
in `Async`. Compare the operation and arguments with the original call.
- Flag read methods such as `findOneAsync` when an options argument contains
update operators such as `$set`, `$unset`, `$push`, `$pull`, or `$inc`.
- Flag write methods whose selector, modifier, or options shape matches a read.
- Flag changed async calls whose Promise is neither awaited, returned, caught,
nor deliberately detached with a documented failure policy.
- Exercise each changed write path and read the record back from the database.
Do not auto-edit a computed argument shape that cannot be resolved statically.
Report it for review.
## `allow` and `deny` during a staged migration
Prefer replacing `Collection.allow` and `Collection.deny` with authenticated
methods. When legacy rules must survive, treat them as a version boundary. Keep
validators compatible with the active Meteor 2 release during preparation,
then convert database reads inside validators to async functions for Meteor 3.
Meteor 3 awaits Promise-returning validators, as documented by the
[collection API](https://docs.meteor.com/api/collections). Test one allowed and
one denied client mutation after the release flip. Validators without database
access may remain synchronous.
## Async framework boundaries
Meteor methods and publish handlers may return Promises. Meteor also awaits a
Promise returned by a server `Meteor.startup` hook. Propagate critical startup
work to that boundary instead of starting it and returning `undefined`:
```javascript
Meteor.startup(async () => {
try {
await Migrations.migrateTo("latest");
} catch (error) {
console.error("Migration failed", error);
throw error;
}
});
```
Do not catch and swallow a failure that must stop startup. Browser event
systems usually do not await an async handler, so catch rejected method calls
inside the handler or deliberately forward them to application error state.
## Server rewrites
```javascript
const doc = await Posts.findOneAsync(id);
const list = await Posts.find(q, { fields, sort, limit }).fetchAsync();
const _id = await Posts.insertAsync(doc);
await Posts.updateAsync(q, mod);
await Posts.removeAsync(q);
await Posts.upsertAsync(q, mod);
```
Cursor methods on the server are async too:
```javascript
await cursor.forEachAsync(fn);
await cursor.mapAsync(fn);
await cursor.countAsync();
```
## Iterators with await
Naive `forEach` / `map` / `filter` callbacks marked `async` do not block the
iterator. See `js-iterators.md`.
## Fibers helpers
The Fibers-era helpers are gone:
| Removed | Replacement |
|--------------------------|------------------------------------------------------|
| `Meteor._sleepForMs(ms)` | `await new Promise(r => setTimeout(r, ms))` |
| `Meteor.wrapAsync(fn)` | Call the underlying async API directly. |
| `Promise.await(promise)` | `await promise` |
| `Future` (`fibers/future`) | The package no longer ships. Refactor to async. |
## Common errors
- `TypeError: Collection.findOne is not a function`: server-side sync API
removed. Use `findOneAsync` and `await`.
- Application code receives a Promise where it expects a document: the
consuming caller is not awaiting. Mark that caller `async` and await the
call.
- `Meteor.call` returns `undefined` on the client: use
`await Meteor.callAsync(...)` or provide a callback.
- `ReferenceError: Fiber is not defined`: a package or app file still
references Fibers. Remove the dependency and rewrite the function.
## HTTP and timers
`HTTP.get`/`HTTP.post` are removed. Use native `fetch`:
```javascript
const res = await fetch(url, { headers });
const data = await res.json();
```
Fetch resolves for HTTP error statuses. Check `res.ok` or the expected status
before treating the request as successful. Review body serialization, response
parsing, redirects, cookies, timeout or cancellation via `AbortSignal`, proxy
behavior, and custom TLS or CA configuration. Preserve the error contract that
callers expect. Test success, non-2xx, malformed response, and network failure.
`Meteor.defer(fn)` for fire-and-forget work survives, but for bulk fan-out
prefer `await Promise.all(items.map(processOne))`.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/migrating-to-async-in-v2/index.md
@@ -1,77 +0,0 @@
# `Meteor.call` vs `Meteor.callAsync`
In Meteor 2.x, `Meteor.call('name', ...args, callback)` was the canonical client
invocation. In Meteor 3.x, prefer `Meteor.callAsync('name', ...args)`, which
returns a `Promise`.
## Client-side rewrites
| 2.x | 3.x |
|--------------------------------------------------|------------------------------------------------------|
| `Meteor.call('m', a, b, (err, res) => ...)` | `try { const res = await Meteor.callAsync('m', a, b) } catch (err) { ... }` |
| `Meteor.call('m', a, b)` (fire-and-forget) | `Meteor.callAsync('m', a, b).catch(console.error)` |
| `Meteor.apply('m', args, opts, cb)` | `await Meteor.applyAsync('m', args, opts)` |
## Server-side rewrites
On the server, `Meteor.call` runs inline (no DDP round trip). Use `callAsync`
for consistency and to make the call site `await`-able.
## Optimistic UI
`callAsync` participates in latency compensation the same way `call` did. If
the method has a client-side stub, the stub runs immediately and the local
collection writes are visible before the server round trip resolves.
## Error shape
Intentional client-visible server failures should throw `Meteor.Error`, whose
rejection exposes `.error`, `.reason`, and `.details`. Do not assume every
rejection has that shape. A local stub exception, API misuse, or transport
failure can produce a native or arbitrary error. Narrow the value first:
```javascript
try {
await Meteor.callAsync('orders.create', input);
} catch (error) {
if (error && typeof error === 'object' && 'error' in error) {
reportMeteorError(error.error, error.reason, error.details);
} else {
reportUnexpectedError(error);
}
}
```
## When to keep `Meteor.call`
Only when interoperating with a library that requires a callback. New code
should always use `callAsync`.
## Method stub macrotask ban
In Meteor 3 the client-side stub of a method must complete within one
microtask tick. The runtime watches for stubs that yield to a macrotask
and logs:
```
Method stub (<method name>) took too long and could cause unexpected problems.
```
These APIs are banned inside a stub body:
- `fetch` and `XMLHttpRequest`
- `setTimeout`, `setInterval`, `setImmediate`
- `indexedDB`
- Web Workers and `Worker.postMessage`
Async stubs are supported. They may await work that settles without yielding
to a browser macrotask, including `*Async` Minimongo writes used by a shared
client/server method definition. Do external I/O after `callAsync` resolves.
Keep the stub limited to deterministic local state changes.
Symptom: the optimistic update flashes (the local write is reverted)
even though the server method succeeds. The stub yielded to a macrotask
and Meteor discarded its writes.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/breaking-changes/call-x-callAsync.md
@@ -1,148 +0,0 @@
# Client reactivity inside async code
In Meteor 2.x, `Collection.findOne` on the client was synchronous and
reactive. Inside a Blaze helper or `Tracker.autorun`, calling it registered
a dependency that re-ran the computation when the underlying data changed.
In Meteor 3.x the sync Minimongo API still exists on the client, and the
`*Async` siblings (`findOneAsync`, `fetchAsync`) also work there. A reactive
read executed before the first `await`, including the first async query, can
register a Tracker dependency. Code after an `await` loses
`Tracker.currentComputation` unless the reactive read is wrapped with
`Tracker.withComputation`.
## The trap
```javascript
// BROKEN: the reactive query runs after an await without its computation.
Template.profile.helpers({
async user() {
await Meteor.callAsync('profiles.prepare', this.userId);
return Meteor.users.findOneAsync(this.userId);
},
});
```
Blaze can unwrap the returned Promise, but the query runs after the first
`await`. It cannot register the helper's Tracker dependency, so subsequent
document changes do not re-run the helper.
## The rule
On the server, use the `*Async` API. On the client, choose based on the calling
code:
- Prefer sync Minimongo in naturally synchronous Blaze helpers, render paths,
and Tracker computations. It avoids Promise state and unnecessary async
propagation while retaining normal reactivity.
- Prefer async Minimongo in shared client/server modules and code that is
already async.
- A reactive query before the first `await` can register dependencies. Wrap
each reactive query after an `await` with `Tracker.withComputation`.
```javascript
// Simple and reactive: sync Minimongo in synchronous UI code.
Template.profile.helpers({
user() {
return Meteor.users.findOne(this.userId);
},
});
```
## Async helpers that need reactivity
An async Minimongo call made before any `await` can also be reactive:
```javascript
Tracker.autorun(async () => {
const users = await Meteor.users.find().fetchAsync();
renderUsers(users);
});
```
If unrelated async work happens first, save the computation and restore it
around the later reactive read:
```javascript
import { Tracker } from 'meteor/tracker';
Template.profile.helpers({
enriched() {
const computation = Tracker.currentComputation;
return (async () => {
const more = await Meteor.callAsync('users.enrich', this.userId);
const doc = await Tracker.withComputation(
computation,
() => Meteor.users.findOneAsync(this.userId),
);
return { ...doc, ...more };
})();
},
});
```
Code before the first `await` keeps the current computation. Code after it does
not. Wrap only the reactive reads that need the saved computation;
`Tracker.withComputation` has a performance cost.
## Blaze async helpers (Blaze 2.7+)
Blaze 2.7+ understands Promises returned by helpers and exposes three
state directives inside `{{#let}}`:
- `@resolved "<name>"`: true once the named `let` binding has settled.
- `@pending "<name>"`: true while the named `let` binding is still
awaiting.
- `@rejected "<name>"`: true if the named `let` binding threw or its
Promise rejected.
```handlebars
{{#let user=getUserAsync}}
{{#if @pending "user"}}<Spinner />{{/if}}
{{#if @rejected "user"}}<Error msg="Could not load user" />{{/if}}
{{#if @resolved "user"}}
{{> profile data=user}}
{{/if}}
{{/let}}
```
This gives the same surface as React Suspense: a spinner during the
await, an error region on rejection, the resolved value once ready.
## Async iteration in Blaze
`{{#each}}` accepts an async helper that returns a Promise of an array
or cursor. Pair it with `{{else}}` for an empty-state branch:
```handlebars
{{#each user in getUsersAsync}}
{{> userRow user=user}}
{{else}}
<p>No users yet.</p>
{{/each}}
```
The minimum Blaze version for these directives is 2.7. If your project
pins an older Blaze, upgrade `blaze-html-templates` and the
`blaze` runtime packages before relying on `@pending`/`@rejected`.
## Symptoms
- Page renders correctly on initial load. Subsequent changes to the data
never appear. A reactive query runs after an `await` without
`Tracker.withComputation`.
- A Blaze partial logs `[object Promise]` instead of the value. The helper
returned a Promise without `@resolved` gating.
- `Tracker.autorun` runs once. Subsequent invalidations are silent. Its
reactive reads occur only after an `await` without restoring the
computation.
## Two-phase data patterns
When a publication ships a base document and a second subscription
enriches it, the enrichment runs in a separate `Tracker.autorun`. Keep
both reads sync (minimongo) inside the helper. Use the explicit
`Meteor.subscribe` handle and `subscription.ready()` to gate rendering.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/front-end/blaze.md
@@ -1,76 +0,0 @@
# Community case studies
Real-world Meteor 2.x to 3.x migration write-ups. Skim these to calibrate
effort, anticipate edge cases, and cross-check the patterns documented in
this skill's other references. Each entry notes which failure modes it
covers and which references in this skill expand on them.
## Production Blaze app on Meteor 3.4 with Rspack
[Migrating a Production Blaze App from Meteor 2 to 3.4 with Rspack](https://blog.galaxycloud.app/meteorjs-2-to-3-blaze-migration-rspack/)
on the Galaxy blog.
Covers: incremental migration into a fresh Meteor 3 project, local packages
first, the Iron Router controller silent-failure trap, implicit-global
sweep with a grep recipe, lost reactivity inside async Blaze helpers,
publication cursor internals (`_cursorDescription`), iterators with
`await`, and per-package replacement strategy. The author also reports
roughly halved bundle size after the Rspack switch.
Maps to: `module-system.md`, `client-reactivity.md`, `publications.md`,
`js-iterators.md`, `package-triage.md`.
## Solo developer migration over 18 months
[Migrating to Meteor 3: a solo developer story](https://dev.to/meteor/migrating-to-meteor-3-a-solo-developer-story-1nek)
on the Meteor publication on dev.to.
Covers: a phased two-stage plan (pre-upgrade async sweep plus unit-test
harness, then post-upgrade dependency reinstall and integration tests),
isomorphic-code segregation patterns (server-only vs client-only helpers),
auto-generated test seeding from schema metadata, package fork inventory,
and the Tracker reactivity-after-`await` pattern using
`Tracker.withComputation`. Useful as a worked example of test-first
migration strategy.
Maps to: `async-rewrites.md`, `client-reactivity.md`, `package-triage.md`.
## Gradual upgrade strategy and dependency triage
[Gradually upgrading a Meteor.js project to 3.0](https://dev.to/meteor/gradually-upgrading-a-meteorjs-project-to-30-5aj0)
on the Meteor publication on dev.to.
Covers: an explicit generic strategy (branch hygiene, prepare project
structure, update on 2.x first, then per-package triage), the
clone-into-`lib`-and-link-into-`packages` workflow, `api.versionsFrom`
dual-version pinning, and the multi-version `api.use('mongo@1.16.0 || 2.0.0')`
syntax.
Maps to: `package-triage.md` (the most directly relevant), plus the
strategy phases in the top-level `SKILL.md`.
## Large-team migration over a year
[The Meteor 3.0 Migration: A Space Exploration Mission](https://dev.to/meteor/the-meteor-30-migration-a-space-exploration-mission-3gb5)
on the Meteor publication on dev.to.
Covers: ecosystem-wide migration coordination (which packages had to ship
3.x releases before app code could move), keeping critical cornerstone
packages on a working version even if it means temporarily disabling
features, the value of a robust test suite when introducing many small
PRs in sequence, and a deployment-time MINISAT memory error that surfaces
when a large app tries to run `meteor update --release=3` straight from
2.x. Reinforces the rule: do not flip the version flag first.
Maps to: `package-triage.md`, the strategy section of `SKILL.md`.
## How to use these
Read in this order when planning a migration:
1. Start with the gradual-upgrade article for the high-level strategy.
2. Read the solo-developer story for the test-first angle.
3. Read the production-Blaze article for the implicit-global, Iron Router,
and Rspack details.
4. Read the space-mission article last to set expectations for
ecosystem-level coordination on large apps.
@@ -1,440 +0,0 @@
# Evaluation cases for `migrate-to-meteor-3`
A human runs these prompts against Claude Code and Cursor with the skill
installed and verifies the agent loads the skill and produces the expected
output.
## Case 1: missing await on server-side find
Prompt:
```
I just upgraded to Meteor 3. This method returns undefined on the server,
but it worked in 2.x:
Meteor.methods({
listPosts() {
return Posts.find({ published: true }).fetch();
},
});
What did I miss?
```
Pass if the agent suggests `await Posts.find(...).fetchAsync()` and marks
the method `async`. Bonus pass if the agent points at
`references/async-rewrites.md`.
## Case 2: implicit global ReferenceError
Prompt:
```
After updating to Meteor 3 my server crashes on boot with
ReferenceError: PostsShowController is not defined. The file that defines
it just has `PostsShowController = RouteController.extend({...})` at the top.
```
Pass if the agent identifies the implicit-global pattern, suggests
`const PostsShowController = ...` (or `export`), and points at
`references/module-system.md`.
## Case 3: Iron Router silent failure
Prompt:
```
Some of my Iron Router routes load the template but the data is missing.
No errors. The publication never starts. I'm on Meteor 3.
```
Pass if the agent identifies the controller naming-convention lookup
breakage and suggests adding `controller: <Name>` explicitly to the
route definition.
## Case 4: lost reactivity after async helper rewrite
Prompt:
```
After migrating this Blaze helper, the page renders once and never updates
when the underlying user document changes:
async user() {
await Meteor.callAsync('profiles.prepare', this.userId);
return Meteor.users.findOneAsync(this.userId);
}
```
Pass if the agent explains that client Minimongo supports both sync and async
APIs, and that the query loses the computation because it runs after the first
`await`. Accept either simplifying the helper to synchronous Minimongo when
the preparation step is unnecessary, or wrapping the later query with
`Tracker.withComputation`. Fail if it claims all async Minimongo queries are
nonreactive.
## Case 5: forEach with await skips items
Prompt:
```
This loop runs but my insertedIds is empty afterwards:
const insertedIds = [];
items.forEach(async (item) => {
const id = await Items.insertAsync(item);
insertedIds.push(id);
});
return insertedIds;
```
Pass if the agent identifies that `forEach` does not await the callback,
and rewrites to `for...of` or `Promise.all`.
## Case 6: cursor transform errors out
Prompt:
```
My publication errors with "publish function returned a Promise":
Meteor.publish('feed', function () {
return Posts.find({}, { transform: async (doc) => {
doc.author = await Users.findOneAsync(doc.authorId);
return doc;
}});
});
```
Pass if the agent calls out that cursor `transform` must be synchronous
and proposes either a separate publication for users or the low-level
publish API.
## Case 7: Atmosphere package fails to resolve
Prompt:
```
After `meteor update --release=3` my build fails because
old-atmosphere-package needs api.versionsFrom('1.5') and there is no
3.x-compatible version on Packosphere.
```
Pass if the agent walks through the triage matrix (replace, fork, remove)
and describes how to fork minimally, update `api.versionsFrom`, and link
from `lib/` into `packages/`.
## Case 8: async propagation through callers
Prompt:
```javascript
function findOrder(id) {
return Orders.findOne(id);
}
function calculateTotal(id) {
return findOrder(id).total;
}
function buildInvoice(id) {
return { total: calculateTotal(id) };
}
Meteor.methods({
createInvoice(id) {
return buildInvoice(id);
},
});
```
"Migrate this call chain to Meteor 3. Do not change only the Mongo call."
Pass if the agent traces the complete caller chain, replaces `findOne` with
`findOneAsync`, awaits the result before reading `.total`, propagates Promise
handling through `buildInvoice`, and stops at the method boundary. Accept
direct Promise forwarding where no resolved value is consumed. Fail if any
caller still treats a Promise as the resolved value.
## Case 9: synchronous constructor boundary
Prompt:
```javascript
class Invoice {
constructor(orderId) {
this.order = Orders.findOne(orderId);
}
}
```
"Migrate this class to Meteor 3 while preserving construction correctness."
Pass if the agent does not mark the constructor async. It must introduce an
async factory or require a preloaded order, await `findOneAsync` outside the
constructor, and keep object construction synchronous.
## Case 10: async publication returning a cursor
Prompt:
```javascript
Meteor.publish("posts.byTeam", async function (teamId) {
const member = await Memberships.findOneAsync({ teamId, userId: this.userId });
if (!member) return this.ready();
return Posts.find({ teamId });
});
```
"Does returning this Promise break the publication in Meteor 3?"
Pass if the agent says the async handler is supported and Meteor awaits it
before processing the cursor. Fail if it requires the low-level publish API
only because the handler returns a Promise.
## Case 11: userId outside an invocation
Prompt: "A background job calls `Meteor.userId()` and throws. Should I replace
it with `await Meteor.userIdAsync()`?"
Pass if the agent states that `Meteor.userIdAsync()` does not exist, explains
that `Meteor.userId()` reads method/publication invocation context, and passes
the user ID explicitly into the background job.
## Case 12: client Accounts callback locus
Prompt: "After moving to Meteor 3.4, must I replace client
`Accounts.createUser(options, callback)` and
`Meteor.loginWithPassword(user, password, callback)`?"
Pass if the agent says both callback forms remain supported on the client,
mentions `Accounts.createUserAsync`, and does not suggest
`Meteor.loginWithPasswordAsync` before Meteor 3.5.
## Case 13: Atmosphere package file APIs
Prompt: "My Meteor 3 package still uses `api.addFiles` and `api.export`. Are
those APIs removed, and must I convert it to `api.mainModule`?"
Pass if the agent says all three APIs remain supported, treats
`api.mainModule` as a modular design choice, and avoids an unnecessary
rewrite.
## Case 14: startup migration propagation
Prompt:
```javascript
Meteor.startup(() => {
Migrations.migrateTo("latest").catch(console.error);
});
```
"Why can requests run before the migration finishes?"
Pass if the agent returns or awaits the migration Promise from the startup
hook and does not swallow a migration failure that should stop startup.
## Case 15: scheduler discards a Promise
Prompt:
```javascript
cron.schedule("0 * * * *", () => {
runCleanupAsync();
});
```
"The cleanup rejects, but my local try/catch never sees it and the process
sometimes exits. Is marking the callback async enough?"
Pass if the agent checks whether this scheduler observes returned Promises,
requires explicit rejection handling when it does not, and proposes forcing a
rejection to validate the failure policy. Fail if it adds `async` without
examining the callback contract.
## Case 16: semantically wrong async rewrite
Prompt:
```javascript
await Meteor.users.findOneAsync(
{ "services.ldap.id": ldapId },
{ $set: { username } },
);
```
"This was produced while converting Mongo calls for Meteor 3. It runs without
a syntax error, but the username is unchanged."
Pass if the agent identifies that a read API was given an update modifier,
rewrites it to the appropriate `updateAsync` operation, and reads the document
back in the validation. Fail if it treats the `Async` suffix as sufficient.
## Case 17: database-backed allow rule
Prompt: "A legacy `Collection.allow` rule performs a server database lookup.
Can I keep it while moving from Meteor 2.16 to Meteor 3.4?"
Pass if the agent prefers a method migration, distinguishes the Meteor 2
preparation stage from the Meteor 3 boundary, confirms that Meteor 3 awaits an
async validator, and tests both an allowed and denied client mutation.
## Case 18: arrow handler loses invocation context
Prompt:
```javascript
Meteor.publish('items.mine', () => {
if (!this.userId) return this.ready();
return Items.find({ ownerId: this.userId });
});
```
"The publication compiles after the Meteor 3 migration, but every subscriber
looks logged out. Should I replace every arrow inside the function?"
Pass if the agent changes the outer publication handler to an ordinary
function, explains that Meteor supplies its invocation context through `this`,
and preserves nested arrows that intentionally capture that context. It must
validate authenticated and unauthenticated subscriptions. Fail if it rewrites
all arrows indiscriminately or replaces `this.userId` with a nonexistent async
API.
## Case 19: callback RPC to `callAsync`
Prompt: "Migrate this client call without losing its error handling:
`Meteor.call('orders.create', input, (error, id) => saveResult(error, id))`."
Pass if the agent uses `await Meteor.callAsync` inside `try`/`catch`, passes the
resolved ID to the success path, and passes the rejection to the existing
error path. It should keep `Meteor.call` only when a callback-only consumer
requires it.
## Case 20: Express 5 WebApp route
Prompt: "After Meteor 3.1, my `WebApp.connectHandlers` route with `/files/*`
stopped matching. Migrate it to the current API."
Pass if the agent moves new code to `WebApp.handlers`, replaces the unnamed
wildcard with an Express 5 named wildcard, and preserves middleware order.
Fail if it says the deprecated alias was removed outright.
## Case 21: async EnvironmentVariable wrapper
Prompt: "A Meteor 2 package patches `Meteor.publish` by nesting
`EnvironmentVariable.withValue` inside the publication handler. After moving
to Meteor 3, code after an `await` loses the `Meteor.userId()` publication
context. Diagnose it and update the wrapper to the current v3-docs placement."
Pass if the agent places `withValue` at the patch wrapper's top level around
the original `publish.call`, returns the scoped result, and leaves the invoked
handler to call the original function without another `withValue`. It must
validate `Meteor.userId()` or the publication invocation before and after an
`await`. Fail if it keeps the nested scope inside the invoked handler.
## Case 22: raw Mongo callback
Prompt: "This Meteor 2 code never calls its callback on Meteor 3:
`Posts.rawCollection().findOne({ _id }, callback)`."
Pass if the agent explains that MongoDB driver 6 removed callback overloads
and rewrites the operation to `await Posts.rawCollection().findOne({ _id })`
with `try`/`catch` at the owning async boundary.
## Case 23: Meteor TypeScript imports become `any`
Prompt: "After moving from Meteor 2 to Meteor 3.5.2, required package
declarations are missing. We want zodern:types; the editor also reports
duplicate identifiers. What should we inspect and configure?"
Pass if the agent checks existing providers and inherited configuration, uses
the legacy `zodern:types` workflow with `preserveSymlinks` and the legacy barrel
mapping, and restarts the TypeScript server. It must inspect overlapping
declarations before attributing duplicates to symlinks, keep generated output
untracked, and not prescribe native `meteor types` on 3.5.2.
## Case 24: React Suspense is optional
Prompt: "Must every Meteor 3 React component switch from
`meteor/react-meteor-data` to the `/suspense` import?"
Pass if the agent says the classic hooks remain supported, requires an
upstream Suspense boundary only when choosing the suspense import, and uses a
stable key for suspense `useTracker`. It must inspect `.meteor/versions`, note
that Suspense began in `react-meteor-data` 2.7.0 and Meteor 3 compatibility in
3.0.0, and prefer 3.0.0+ for the migrated app. If it converts `useFind`, it
must change the signature. Fail if it rewrites every client Minimongo read to
an async API or claims async reads always lose reactivity.
## Case 25: `bindEnvironment` capture timing
Prompt: "A global event emitter is wrapped with `Meteor.bindEnvironment` at
server startup. Later, events created by logged-in methods still see no
`Meteor.userId()`. Why?"
Pass if the agent explains that the wrapper captured the startup environment,
not a future method invocation. It should pass `this.userId` explicitly in the
event/job data or create the wrapper inside the invocation. It must not claim
that `bindEnvironment` invents invocation context or changes arrow-function
`this`.
## Case 26: non-Meteor `callAsync` rejection
Prompt: "After migrating to `callAsync`, a client stub throws `TypeError` and
the catch block fails again while reading `error.error`."
Pass if the agent keeps `Meteor.Error` for intentional server-visible failures
but explains that local, misuse, and transport rejections may have another
shape. It must narrow the caught value before reading Meteor-specific fields.
## Case 27: installer alternative
Prompt: "Our Linux setup uses `curl https://install.meteor.com/ | sh`. Must we
replace it because Meteor 3 phased it out?"
Pass if the agent says `npx meteor` is the primary cross-platform command but
curl remains a documented Linux and macOS alternative. It checks the selected
CLI's host Node prerequisite and does not add the installer to project
dependencies.
## Case 28: fresh CLI installation near miss
Prompt: "There is no Meteor application yet. Install the Meteor 3 CLI on this
new Windows workstation and make sure PATH works."
Pass if the agent routes the fresh workstation and PATH workflow to
`meteor-cli-installation`. Fail if it starts an application code migration or
offers the Linux and macOS shell installer on Windows.
## Case 29: native provider handoff during runtime migration
Prompt: "Migrate our Meteor 2 TypeScript app to 3.6-beta.1, including async APIs and an explicit native declaration switch. Which workflow owns each part?"
Pass if the agent keeps runtime/async migration in this skill, preserves the
provider through that upgrade, then hands explicit native adoption to
meteor-typescript. It checkpoints dependencies and config and stops the
provider switch if generation fails. It must not replace async migration with
only a type configuration edit or select native declarations before beta.1.
## Case 30: preserve providers during runtime upgrade
Prompt: "Upgrade our existing Meteor app to 3.6-beta.1 but keep the working TypeScript provider. meteor types exits zero saying zodern:types is installed. Did it generate native types, and should we remove the provider?"
Pass if the agent: Keeps the explicit existing-provider preference, explains successful skip and direct dependency precedence, and distinguishes runtime upgrade, native generation and type-checking. Does not remove working providers.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 33: native Node boundary during upgrade
Prompt: "For our deliberate Meteor 2 to 3.6-beta.1 migration, can the existing Node 24 production image stay unchanged?"
Pass if the agent: Uses Node 26.8.2/npm 11.19.0 for beta.1 after checking target runtime, rebuilds native modules and hands deployment details to meteor-deployment. Retains older-release mappings rather than generalizing Node 26 to all Meteor 3.
Fail if it contradicts these boundaries or invents unsupported APIs.
## Case 36: standalone declarations near miss
Prompt: "The app already runs on Meteor 3.6-beta.1. Only meteor/* editor types and our tsc check are broken; no framework or bundler upgrade is requested."
Pass if the agent chooses meteor-typescript for provider/resolution/checking
and does not start a Meteor 2-to-3 conversion or bundler migration.
@@ -1,122 +0,0 @@
# Iterators with `await`
Naive `Array.prototype.forEach`, `Array.prototype.map`, `Array.prototype.filter`,
and `Array.prototype.find` do **not** make their containing function async
just because the callback is marked `async`. The iterator returns synchronously;
the callback's Promise is discarded.
## `forEach`
```javascript
// BROKEN: returns before any awaited work resolves
items.forEach(async (item) => {
await processItem(item);
});
```
Replace with `for...of`:
```javascript
for (const item of items) {
await processItem(item);
}
```
This runs the items serially. If order does not matter and you want
concurrency, use `Promise.all`:
```javascript
await Promise.all(items.map((item) => processItem(item)));
```
## `map`
```javascript
// BROKEN: result is an array of Promises, not values
const ids = users.map(async (u) => await Users.insertAsync(u));
```
Two correct shapes:
```javascript
// concurrent
const ids = await Promise.all(
users.map((u) => Users.insertAsync(u)),
);
// serial
const ids = [];
for (const u of users) {
ids.push(await Users.insertAsync(u));
}
```
For large arrays, prefer the serial form to avoid hammering Mongo with N
parallel writes.
## `filter`
`Array.prototype.filter` cannot be awaited. Two patterns:
```javascript
// concurrent then prune
const checks = await Promise.all(
items.map(async (it) => ({ it, keep: await predicate(it) })),
);
const kept = checks.filter((c) => c.keep).map((c) => c.it);
// serial
const kept = [];
for (const it of items) {
if (await predicate(it)) kept.push(it);
}
```
## `find`
```javascript
// BROKEN
const hit = items.find(async (it) => await match(it));
```
Replace with `for...of`:
```javascript
let hit;
for (const it of items) {
if (await match(it)) {
hit = it;
break;
}
}
```
## `reduce`
Reduce with an async callback usually wants an accumulator that is itself
a Promise:
```javascript
// serial reduce
const sum = await items.reduce(async (accP, item) => {
const acc = await accP;
return acc + await score(item);
}, Promise.resolve(0));
```
For readability, prefer `for...of` with an explicit accumulator.
## Cursor methods are different
Meteor cursor iterators on the server already have async siblings. Use
those instead of converting a `cursor.fetch()` array to a Promise loop:
```javascript
await cursor.forEachAsync(async (doc) => { /* ... */ });
const mapped = await cursor.mapAsync(async (doc) => { /* ... */ });
```
These properly await each callback.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/migrating-to-async-in-v2/index.md
@@ -1,119 +0,0 @@
# Module system, strict mode, implicit globals
Meteor 3 enforces ES module semantics on every file that uses `import`,
`export`, or top-level `await`. Strict mode is the default. Implicit
file-scoped globals (assignment without `var` / `let` / `const`) no longer
become visible to other files. Apps that relied on the pre-1.7 eager-loading
behavior surface a lot of `ReferenceError: X is not defined` at startup.
## The implicit-global pattern
Pre-3 Meteor allowed:
```javascript
// pre-3: visible to every file that loaded later
PostsShowController = RouteController.extend({ /* ... */ });
Search = { query: function () { /* ... */ } };
SearchResults = function (params) { /* ... */ };
```
After the upgrade, every line above throws `ReferenceError` at runtime.
## The fix
For file-local symbols, declare with `const` / `let`:
```javascript
const PostsShowController = RouteController.extend({ /* ... */ });
const Search = { query: async function () { /* ... */ } };
```
For symbols shared across files, export and import:
```javascript
// lib/search-results.js
export function SearchResults(params) { /* ... */ }
// client/main.js
import { SearchResults } from '../lib/search-results';
```
## Finding the offenders
Grep for assignments at the start of a line that start with a capital letter
and have no declaration:
```bash
grep -nE '^[A-Z][A-Za-z0-9_]+ = ' -- 'client/**/*.js' 'lib/**/*.js' 'server/**/*.js'
```
Every hit either becomes a `const` or moves to `export`. Iterate
fix-restart-fix until the server boots cleanly.
## Explicit import trees
Meteor's standard bundler retains backward-compatible eager loading when an
app has no `meteor.mainModule`. Explicit entry points are recommended because
they make load order and dependencies deterministic. They are required when
the app adopts the Rspack integration, which does not auto-discover an entry.
With `mainModule`, `client/main.js` must import every Blaze `.html` template
and every helper or event file it needs:
```javascript
// client/main.js
import './main.import.less';
import './views/application/layout.html';
import './views/application/layout.js';
import './views/posts/show.html';
import './views/posts/show.js';
import '../lib/router.js';
import '../lib/collections/posts.js';
```
Symptoms of a missed import:
- `{{> myTemplate}}` renders nothing. The template was never registered.
- Template helpers and event handlers do not fire. The `.js` file was not
loaded.
- The console logs `Template.X is not defined`.
## The Iron Router controller trap
Iron Router auto-discovers controllers by name: `route('postsShow', ...)`
looks for a global called `PostsShowController`. In Meteor 3 that global
does not exist; `const PostsShowController = ...` is module-scoped. The
route still renders its template, but `onBeforeAction`, `waitOn`, and
`data` never run. Subscriptions never fire. Minimongo stays empty. There
is no error.
Fix every route definition:
```javascript
// broken in Meteor 3: relies on global lookup
this.route('postsShow', {
path: '/posts/:slug',
});
// works: explicit controller reference
this.route('postsShow', {
path: '/posts/:slug',
controller: PostsShowController,
});
```
Do not rely on Iron Router's naming convention in Meteor 3 at all. Pass
`controller:` on every route that has one.
## Strict mode side effects
- Assignment to an undeclared variable throws. No more "oops, typo".
- `arguments.callee` is not available.
- Duplicate parameter names throw.
- Octal literals (`010`) throw. Use `0o10`.
- `with` is disallowed.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/api/global-variables.md
@@ -1,203 +0,0 @@
# Other breaking changes
Smaller breaking changes from the Meteor 3 upgrade that do not warrant
their own reference but still bite. Skim this once after the framework
flip; come back when a specific symptom matches.
## `Meteor.EnvironmentVariable.withValue` placement
Affects package authors that wrap `Meteor.publish`, `Meteor.methods`, or other
Meteor primitives to propagate dynamic context into a handler. In Meteor 3,
`withValue` uses `AsyncLocalStorage.run`; its context follows the callback's
Promise through `await`.
When patching `Meteor.publish`, place `withValue` at the wrapper's top level
around the call to the original `publish`. Do not introduce that scope inside
the invoked publication handler. Meteor establishes its own publication
invocation context before calling the handler, and the nested placement broke
packages that needed `Meteor.userId()` or another invocation value.
Wrong: introducing `withValue` inside the invoked handler:
```javascript
function patchPublish(publish) {
return function (name, func, ...args) {
return publish.call(this, name, function (...handlerArgs) {
return _publishConnectionId.withValue(this?.connection?.id, () =>
func.apply(this, handlerArgs)
);
}, ...args);
};
}
```
Right: scope the complete patched registration flow and return its result:
```javascript
function patchPublish(publish) {
return function (name, func, ...args) {
return _publishConnectionId.withValue(this?.connection?.id, () =>
publish.call(this, name, function (...handlerArgs) {
return func.apply(this, handlerArgs);
}, ...args)
);
};
}
```
Regression-test the invoked publication before and after an `await`. Its
`Meteor.userId()` or `DDP._CurrentPublicationInvocation` value must remain
consistent with the handler's `this.userId`. A direct `EnvironmentVariable`
test should likewise read the scoped value on both sides of an `await`.
## Mongo driver 6.x: callbacks removed on `rawCollection`
Meteor 3 ships MongoDB Node driver 6.x. The driver removed callback-style
overloads for every async operation. If your code drops to `rawCollection`
or `rawDatabase` for native driver access, rewrite the call sites:
```javascript
// Meteor 2.x: callback
Posts.rawCollection().findOne({ _id }, (err, doc) => { /* ... */ });
// Meteor 3.x: promise
const doc = await Posts.rawCollection().findOne({ _id });
```
The same applies to `rawCollection().aggregate(...).toArray(cb)`,
`insertOne(doc, cb)`, `bulkWrite(ops, cb)`, etc. If a third-party package
still passes a callback into a driver call, fork and rewrite.
## CLI changes
### `--vue2` flag removed
`meteor create --vue2` no longer exists. Vue 2 reached end of life in
December 2023. For Vue, use `meteor create --vue` (Vue 3).
### `meteor reset` no longer wipes Mongo by default
`meteor reset` now clears only the local build cache. The local MongoDB
data survives. To also wipe the database (the Meteor 2.x default), pass
`--db`:
```bash
meteor reset # clears build cache only
meteor reset --db # clears build cache AND local Mongo
```
Update any CI or development scripts that rely on `meteor reset` wiping
the database.
## Release-specific Node baseline
Meteor 3 does not have one Node baseline across every minor release:
| Meteor release | Bundled Node |
|----------------|--------------|
| 3.0 | Node 20 |
| 3.1 through 3.4 | Node 22 |
| 3.5.x and 3.6-beta.0 | Node 24 |
| 3.6-beta.1 | Node 26.8.2 (npm 11.19.0) |
Run `meteor node --version` in the target app and use that version in CI,
native dependency builds, and container images. Audit `engines.node` and
native packages whenever the target Meteor release changes Node major.
## "Cannot enlarge memory array" during `meteor update`
Running `meteor update --release=3.x` directly from a heavy 2.x project
sometimes crashes with:
```
MINISAT-out: Cannot enlarge memory arrays.
abort() at Error
```
The version-constraint solver (`minisat`) runs out of memory while
resolving the upgrade against a large `.meteor/packages` file. The fix
is to reduce the package surface before the upgrade:
1. Remove every Atmosphere package the app no longer uses.
2. Update or fork remaining packages to declare
`api.versionsFrom(['2.x', '3.0'])` so the solver has fewer
alternatives to consider.
3. Retry the upgrade. If it still fails, comment out non-core packages
in `.meteor/packages`, upgrade, then re-add them one by one.
This is the same root cause as "the install just hangs forever" reports.
## `Meteor.bindEnvironment` for external callbacks
`Meteor.bindEnvironment` captures Meteor dynamic-variable values at the moment
the wrapper is created and restores those values when the callback later runs.
It does not discover the identity of a future method or publication
invocation, and it does not change JavaScript's `this` binding.
Create the wrapper inside the invocation whose environment must be preserved.
For identity, capture `this.userId` explicitly so a long-lived callback does
not depend on implicit request context:
```javascript
import { Meteor } from 'meteor/meteor';
import { check } from 'meteor/check';
Meteor.methods({
startImport(jobId) {
check(jobId, String);
if (!this.userId) throw new Meteor.Error('not-authorized');
const userId = this.userId;
externalSdk.once(jobId, Meteor.bindEnvironment(async (payload) => {
await Posts.insertAsync({ payload, createdBy: userId });
}));
},
});
```
A wrapper created by top-level registration captures the top-level
environment, which normally has no user invocation. For a global event emitter
or background queue, put the authenticated identity in the job or event data
and pass it explicitly. Use `bindEnvironment` only for dynamic variables that
exist when the callback is registered.
## Monkey-patching from `Meteor.startup()`
Code that monkey-patches a Meteor API (intercepting `Meteor.publish`,
wrapping `Accounts.createUser`, etc.) must run after the API is loaded.
On 3.x, package load order is less forgiving than on 2.x; patches at the
top of a file may fire before the target API exists.
Wrap the patch in `Meteor.startup`:
```javascript
import { Meteor } from 'meteor/meteor';
Meteor.startup(() => {
const original = Meteor.publish;
Meteor.publish = function (name, handler, ...rest) {
return original.call(this, name, async function (...args) {
// patched behavior
return handler.apply(this, args);
}, ...rest);
};
});
```
Symptom: the patch is in the codebase but the wrapped behavior never
runs. The patch fired before the target API loaded, so `Meteor.publish`
was `undefined` at patch time and the assignment was a no-op.
## NPM installer
Use `npx meteor` as the primary cross-platform command. The documented
`curl https://install.meteor.com/ | sh` command remains an alternative for
Linux and macOS; do not describe it as phased out. Do not add the npm Meteor
installer to the application's `package.json`.
Match the host Node prerequisite to the selected CLI version. Current Meteor
3.5 installation docs require Node 24+, while earlier Meteor 3 tool releases
bundle earlier Node majors as shown above.
---
Source: https://github.com/meteor/meteor/blob/devel/v3-docs/v3-migration-docs/breaking-changes/index.md
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