fix(errors): pass an AppError to responses.error at the last two non-error sites - #4066
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…error sites responses.error(...)(x) reads x.details off whatever it is handed, so a non-error argument yields no payload.details. Two sites remained after #4062: analytics.requireFeatureFlag passed a flat {type, flag} — its type was silently dropped in every environment — and home.controller passed the raw health-check payload. flag is deliberately left off the details whitelist: it names an internal feature-toggle key, and publishing it would let any authenticated caller enumerate which flags gate which routes. type alone crosses. Closes #4064 Claude-Session: https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
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WalkthroughThe PR updates feature-flag and degraded-health error calls to use ChangesStructured error responses
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to Feature-flag denials now provide a machine-readable type without exposing internal flag names, and degraded health responses retain their structured details without changing healthy responses. No concrete merge-blocking runtime, security, or data-integrity risk remains. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@lib/middlewares/analytics.requireFeatureFlag.js`:
- Around line 46-64: Add JSDoc headers to requireFeatureFlag and
requireFeatureFlagMiddleware in lib/middlewares/analytics.requireFeatureFlag.js
lines 46-64, including concise descriptions, `@param` entries for each argument,
and `@returns` entries. Add a concise JSDoc header with `@returns` to the async test
callback in lib/middlewares/tests/analytics.requireFeatureFlag.unit.tests.js
lines 134-158. Append the specified recurring documentation mistake entry to
ERRORS.md.
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ERRORS.mdlib/middlewares/analytics.requireFeatureFlag.jslib/middlewares/tests/analytics.requireFeatureFlag.unit.tests.jsmodules/home/controllers/home.controller.jsmodules/home/tests/home.controller.unit.tests.js
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Matches the requireQuotaMiddleware precedent in billing.requireQuota.js. Claude-Session: https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
The 401 and 403 branches return the responses.error envelope object, not undefined, so Promise<void> was wrong. Notes that requireQuotaMiddleware carries the same inaccuracy — left alone, out of scope. Claude-Session: https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
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What
responses.error(res, status, title, description)(x)readserror.detailsoff whateverxis. Two sites passed something that is not an error, sopayload.detailsnever emitted.This is the third and final instalment of a class already closed in
billing.requireQuota.js(#4062) and at nineAppError.detailssites (#4059).lib/middlewares/analytics.requireFeatureFlag.jspassed{ type: 'FEATURE_FLAG_DISABLED', flag }flat, with no.detailswrapper — sopayload.detailswas absent in every environment. A client blocked by a feature flag could not tell it was a flag rejection at all, let alone distinguish it from any other 403.modules/home/controllers/home.controller.jspassed the raw health-check payload as the error argument. No leak today, but the same wrong shape — and a health payload is exactly the kind of object that accumulates internal detail over time.Both now pass a real
AppErrorcarrying the data under.details.flagstays off the whitelist — deliberatelytypecrosses into the production body: it tells a client "you were gated by a feature flag", the same class of signal as an HTTP status code.flagdoes not. It names an internal feature-toggle key, and publishing it would let any authenticated caller enumerate which flags gate which routes. It stays indetailsfor dev-only debugging and never reaches a production body.That is a judgement call about what a legitimate client needs, not an oversight — recorded here so it is not "fixed" later by someone reading the whitelist as an accident.
Verification
Each new test proven red against the pre-fix production code, then green after restoring it:
Both assert
payload.detailsin production mode, not the dev-only serialized blob. That blob-only test shape is what let #4062 ship undetected; it is not reproduced here.Lint clean. Touched suites: 2 suites / 10 tests green.
The class is now closed — swept and counted
Every
responses.error(...)(x)call site inlib/,modules/andconfig/, by final argument:err()(none)parsed.error/result.error/parsedParams.errornew Error('Stripe is not configured')billing.webhook.controller.js:20)The remaining matches are test fixtures. No production site is left passing a non-error argument.
modules/billing/controllers/billing.controller.js:26bypassesresponses.errorentirely — a separate known issue, untouched.Closes #4064
https://claude.ai/code/session_0185ELiCjZaBJx8PH4xoSsZb
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