fix(pwa): gate service-worker cache-generation activation on precache success - #699
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… success The install handler treated a partial or fully failed precache as non-fatal: it called skipWaiting() unconditionally and activate then pruned every prior cache generation regardless of whether the new one actually completed. A transient network failure during precache could therefore replace a working, complete cache with an incomplete one and destroy the fallback. Install now stamps a synthetic admission marker into CACHE_STATIC only after every precache URL succeeds, and only then calls skipWaiting() — a failed precache leaves a currently-active prior generation fully in control. Activate independently checks for that marker before pruning any older generation; without it, every existing cache (including the last known-good one) is left untouched, and a later successful install can still admit and prune normally.
3 new tests added in the prior commit shift the Vitest total from 7644 to 7647; test-file count is unchanged at 604.
…nership fake Forwarding an already-optional opts.rejectOnDelete/failAddAllFor value explicitly sets the destination property to string | undefined, which exactOptionalPropertyTypes distinguishes from omitting the key entirely.
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Reviewer's GuideThe service worker now uses a cache-local completion marker as an admission gate: only a fully successful precache may trigger skipWaiting and allow activate to prune older owned generations, while failed updates leave the last known-good cache intact. VM-based regression tests cover successful, failed, and recovered update flows, and README test metrics are synchronized. Sequence diagram for service-worker cache-generation admissionsequenceDiagram
participant Browser
participant SW as ServiceWorker
participant StaticCache as CACHE_STATIC
participant Caches as CacheStorage
Browser->>SW: install
SW->>StaticCache: cache.addAll(PRECACHE_URLS)
alt precache succeeds
SW->>StaticCache: cache.put(PRECACHE_ADMISSION_URL, Response)
SW->>SW: skipWaiting()
Browser->>SW: activate
SW->>StaticCache: match(PRECACHE_ADMISSION_URL)
StaticCache-->>SW: marker found
SW->>Caches: keys()
SW->>Caches: delete(stale owned generations)
SW->>Browser: clients.claim()
else precache fails
SW->>SW: swLogger.warn()
Note over SW: No skipWaiting()
Browser->>SW: activate
SW->>StaticCache: match(PRECACHE_ADMISSION_URL)
StaticCache-->>SW: marker absent
SW->>Browser: clients.claim()
Note over Caches: Existing generations remain untouched
end
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📝 WalkthroughWalkthroughThe service worker now filters duplicate precache URLs, rejects failed precaches, and admits generations only after successful installation. Activation cleanup requires admission. Tests cover retries, duplicate URLs, cache ownership, and lifecycle behavior. README metrics now report 7,650+ tests. ChangesPrecache admission and cache ownership
Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Browser
participant ServiceWorker
participant CacheStorage
participant Clients
Browser->>ServiceWorker: trigger install
ServiceWorker->>CacheStorage: precache unique URLs
CacheStorage-->>ServiceWorker: success or failure
ServiceWorker->>CacheStorage: write admission marker after success
ServiceWorker->>CacheStorage: verify admission during activation
ServiceWorker->>CacheStorage: prune stale owned caches when admitted
ServiceWorker->>Clients: claim clients when admitted
Merge Risk: 🟠 High · up to Equivalent manifest entries can still prevent the new service worker from installing, leaving users on an older cache generation. Deduplication should be fixed before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@public/sw.js`:
- Line 132: Update the precache failure handler in public/sw.js at lines 132-132
to rethrow the caught error after logging it, causing installation to reject.
Update tests/unit/serviceWorkerCacheOwnership.test.ts at lines 315-316 to expect
install rejection and omit activation dispatch for the failed worker.
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Catching a precache error without rethrowing let event.waitUntil() resolve successfully, so a failed installation could still reach "installed" and "waiting", later activate naturally, and call clients.claim() with an incomplete cache. Once that worker controls pages, its own CACHE_STATIC/ CACHE_DYNAMIC constants point only at the new generation, so merely leaving the previous generation's cache un-pruned in CacheStorage never meant it was still being served. The install handler now rethrows on precache/admission-marker failure so the whole installation rejects. A worker whose install() rejects never reaches "installed" or "waiting" (browser-native Service Worker lifecycle states), so it can never activate, claim clients, or receive the app's SKIP_WAITING update message (register-sw.ts only ever targets registration.waiting / a worker whose state reached 'installed') — closing that path structurally, with no additional gating needed in the message handler. The activate-side admission-marker check is retained as defense in depth. Regression tests now prove the lifecycle directly against the real install and activate handlers: a failed precache rejects install and never calls skipWaiting(); a successful install writes the marker and calls skipWaiting(); a real second install attempt after a failed one still succeeds normally. README's test-count metric is synced (7647 -> 7649) for the resulting net test-count change.
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…se in depth) The markerless activate branch logged a warning and skipped pruning but still fell through to clients.claim(), which is inconsistent with that branch's defense-in-depth purpose: if admission can't be proven, that generation should not take control of any page either. It now returns immediately after the warning; only an admitted generation reaches pruning and clients.claim(). The authoritative admission boundary remains the rejected install() lifecycle from the prior commit — this only closes the same gap for the (structurally unreachable) case where activate runs anyway. Strengthened the existing recovery test instead of adding a new one: it now counts clients.claim() calls and asserts the count stays 0 through the simulated markerless activate and becomes 1 only after the real second successful install + activate.
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… shell URLs
Two independent reviewers flagged that VitePWA's injectManifest globPatterns
(**/*.{js,css,html,svg,...}) sweep up index.html, offline.html and
favicon.svg into _WB_MANIFEST, which duplicates the same three URLs already
listed explicitly (with the deployment BASE prefix) in sw.js's own
PRECACHE_URLS. Verified empirically with a real production build: all three
appeared as bare manifest entries resolving to the same absolute URLs as the
explicit list, which cache.addAll() rejects with InvalidStateError on
duplicate requests. Combined with the prior commit's install-rejection fix,
this meant every production install would fail permanently, not just on a
genuine precache failure.
Excluded the three files from the injected manifest via globIgnores — they
are already correctly precached by the explicit list, and none of them are
content-hashed, so nothing is lost: cache invalidation for the whole static
generation already happens via the APP_VERSION-keyed cache name change, not
per-file manifest revisions. Re-built production output afterward and
confirmed all three no longer appear in the generated manifest (2502 -> 2499
entries, an exact -3).
Also fixed a real internal inconsistency a reviewer found in the test file:
ADMISSION_MARKER_URL hardcoded '/WorldScript-Studio/' while claiming to be
fully "extracted from source, not hardcoded" — only the suffix was. Factored
the hardcoded base into one shared TEST_BASE constant also used by
loadServiceWorker()'s selfMock.location.pathname, so the two can no longer
silently diverge.
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…t revisions The prior commit avoided cache.addAll()'s duplicate-request rejection by excluding index.html, offline.html and favicon.svg from VitePWA's injected manifest via vite.config.ts globIgnores. Review (chatgpt-codex-connector) correctly identified that this throws away real signal: those entries carry a content-hash revision that changes sw.js's own bytes whenever one of the files is edited, which is what lets the browser detect and install an update even when package.json's version isn't bumped. Removing them from the manifest meant a content-only change to any of the three would silently ship stale content to existing installs indefinitely. Reverted the vite.config.ts exclusion — the manifest keeps full revision tracking for these files again. Instead, sw.js's own PRECACHE_URLS construction now resolves every manifest entry and every explicit shell URL to an absolute URL and drops any manifest entry that collides with an explicit one before the list ever reaches cache.addAll(). The revision data stays embedded in sw.js's compiled source (still driving the update-detection signal); only the redundant duplicate *request* is removed. Strengthened the test harness to make this a real regression guard rather than an assumption: the fake cache's addAll() now mirrors the real Cache API by rejecting when two entries resolve to the identical absolute URL (it previously silently deduped everything via a Set, which would have let this exact bug pass unnoticed). Added a dedicated test with a synthetic manifest containing entries that collide with the explicit shell list, confirming install still succeeds. Mutation-tested by reverting the dedup logic and confirming the new test fails with the expected simulated InvalidStateError, then restored the fix. Re-verified with a real production build: the manifest still carries revision-tracked entries for all three files, and the final precache list sent to addAll() contains no duplicates. README test-count metric resynced via the authoritative `pnpm run sync:readme` script rather than manual editing (7649 -> 7650 for the net new test).
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Inline comments:
In `@public/sw.js`:
- Around line 49-51: Update the manifest URL construction around manifestUrls to
deduplicate entries after resolving them against self.location.href, while still
excluding URLs in explicitResolvedUrls. Add a regression case covering
equivalent non-shell entries such as assets/app.js and ./assets/app.js, ensuring
cache.addAll receives each resolved URL only once.
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…plicit shell list CodeRabbit correctly identified that the prior commit's dedup only compared manifest URLs against EXPLICIT_SHELL_URLS, so two manifest entries that resolved to the same URL as each other (without matching anything in the explicit list) would still both reach cache.addAll() and trigger the same InvalidStateError this whole fix exists to prevent. Now tracks every resolved URL seen so far in one shared set, seeded with the explicit shell URLs, so any manifest entry colliding with either the explicit list or an earlier manifest entry is dropped. Added a dedicated negative-path test with two manifest entries that collide only with each other (not the explicit list), addressing a related finding from cubic: the existing test only exercised the fake's duplicate-rejection branch via entries that were already filtered by the explicit-list check, so it didn't prove the rejection path was reachable through this second class of collision. Mutation-tested by reverting the mutual-dedup logic and confirming the new test fails with the expected simulated InvalidStateError, then restored the fix. Re-built production output and confirmed the manifest still carries revision-tracked entries for the three shell files. README test-count metric auto-resynced by `pnpm run build`'s own prebuild hook (7650 -> 7651 for the one net new test).
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#705) * fix(ci): require pre-merge CHANGELOG PR-reference for governed changes scripts/check-doc-metrics.mjs's completeness gate only enforces a PR-number reference in CHANGELOG.md's [Unreleased] section AFTER squash-merge, once the commit is on main and its subject already carries "(#N)" — pre-merge, a branch's own not-yet-squashed commits are (correctly) exempted from that check. This has left a recurring blind spot: nothing stops a governed PR from merging without ever adding the entry, even though its real PR number is already knowable via the GitHub API before merge. It has recurred three times (#678->#679, #684->#685, #699->#700), each requiring a same-pattern follow-up PR to add the missing reference after the fact. Adds a new, independent pre-merge admission gate (.github/workflows/pr-changelog-reference.yml + scripts/check-pr-changelog-reference.mjs) that fails a governed (feat|fix| perf) PR's CI unless CHANGELOG.md's [Unreleased] section already references it as "PR #<N>", using the PR number from GitHub's own event payload — not inferred from commit history. Deliberately stricter grammar than the existing post-merge bare "#NNN" matcher, since pre-merge there is no squash-appended "(#NNN)" to anchor on. Mirrors pr-text-attribution.yml's base-ref self-grading pattern (runs the checker from the PR's base ref, with a documented one-time bootstrap fallback) so a PR cannot weaken the check that grades it. The existing scanUnreleasedTruth machinery in check-doc-metrics.mjs — governing local pre-push behavior and the historical post-merge/branch-local exemption — is untouched. Complements, but does not implement, issue #675's broader deterministic- identifier-contract scope (replacing the unnumbered-commit slug-match fallback) — this gate only closes the narrower pre-merge admission gap for PRs that already have a real, known PR number, which is the common case. 13 regression tests plus real-text fixtures reproducing all three historical incidents (#678/#679, #684/#685, #699/#700) in tests/unit/checkPrChangelogReference.test.ts. * docs: reference PR #705 in the CHANGELOG PR-admission gate entry * test: reduce duplication in checkPrChangelogReference regression tests CodeScene flagged the new test file's code health below 10.00 due to repeated per-test literal boilerplate. Factored a shared fixture builder and consolidated closely related cases into it.each() tables — same 18 assertions, same coverage, no behavior change to the checker itself. * docs: sync README test-count metrics after test-file refactor * fix(ci): scope CHANGELOG PR-reference check to actual bullet entries The check previously tested the whole raw [Unreleased] section text, so a PR number mentioned only in prose (e.g. a reviewer note directly under a ### heading, not inside a real release-note bullet) could satisfy admission without ever adding a genuine changelog entry. Scoped to parsed bullet entries (joining soft-wrapped continuation lines, mirroring check-doc-metrics.mjs's splitUnreleasedEntries) so only a reference inside an actual bullet counts. Mutation-tested: reverted to whole-section matching, confirmed exactly the new prose-bypass regression test failed, restored. * fix(ci): close two review-found bypasses in the CHANGELOG PR-reference gate - isReferencedByPrLabel used (?!\d) as its trailing boundary, so a malformed near-miss like "PR #705alpha" or "PR #705_internal" satisfied the gate. Widened to (?!\w), a full word boundary, matching the existing post-merge checker's own boundary discipline. - extractBulletEntries appended any non-blank line to the current bullet as a soft-wrap continuation, including a Markdown heading with no blank line before it — so a heading like "### Notes: PR #700" right after an unrelated bullet could satisfy the gate. Now flushes the current entry on a heading line before the continuation check. Also fails closed (instead of silently skipping) when a pull_request event payload is missing its numeric "number" field, rather than treating that the same as a genuinely absent pull_request event. 5 new regression tests (word-boundary near-misses x2, heading-continuation bypass, doubling as the mutation-tested proof for both fixes). * fix(ci): strip comments before locating the [Unreleased] heading getUnreleasedSectionText searched for the heading in the raw changelog, then stripped HTML comments from the extracted section afterward. A commented-out template containing a literal "## [Unreleased]" line earlier in the file could hijack the section-boundary search — slicing off the opening "<!--" before comment-removal ran left the fake section's own placeholder content unstrippable, so a bogus "PR #<N>" inside the comment could satisfy the gate while the real [Unreleased] section had no reference at all. Strips comments from the whole document up front instead, before any heading/section parsing. Regression test reproduces the exact scenario; mutation-tested by reverting to the old order and confirming exactly that test fails. * fix(ci): reject malformed PR metadata and generalize bullet-continuation scoping - isValidPrMetadata (extracted for testability) now rejects a non-integer, zero, or negative PR number, and a missing/blank title, instead of only checking typeof number === 'number' (which admits NaN and negative values). Fails closed instead of silently exit-0'ing on a malformed event payload. - extractBulletEntries's heading-only flush was one instance of a broader bug class: any flush-left non-bullet line (blockquote, code fence, hr) was still absorbed as a continuation. Replaced with the general rule this project's own CHANGELOG entries already follow: a continuation line must be indented. A flush-left line that isn't a new bullet ends the current entry, without enumerating every Markdown block type individually. New regression tests for both, plus a blockquote-continuation case mirroring the heading one. Mutation-tested: each fix reverted individually, confirmed exactly its own tests fail, restored. * refactor(ci): extract isIndentedContinuation to simplify extractBulletEntries CodeScene flagged extractBulletEntries' compound boolean condition as too complex. Named predicate, no behavior change — all 32 existing tests pass unmodified.
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Purpose
Fixes #525. The service worker's
installhandler treated a partial or fullyfailed precache as non-fatal by catching the error without rethrowing —
event.waitUntil()therefore resolved successfully even when precache failed.Not calling
skipWaiting()on failure did not stop the worker frominstalling: a worker that finishes
installwithout rejecting still reachesthe "installed"/"waiting" state and can later activate naturally once the
previous worker has no controlled clients. Once active, that worker's own
fetch handlers read only its own (version-specific)
CACHE_STATIC/CACHE_DYNAMICconstants — so merely leaving the previous generation's cacheun-pruned in
CacheStoragenever meant it was still being served; anincomplete generation could take over and serve broken/missing assets with no
working fallback.
Fix
installnow rethrows on precache/admission-marker failure, so the wholeinstallation itself rejects. A worker whose
install()rejects never reaches"installed" or "waiting" — these are browser-native Service Worker lifecycle
states — so it can never activate, call
clients.claim(), or receive theapp's
SKIP_WAITINGupdate message (register-sw.tsonly ever targetsregistration.waiting/ a worker whosestatereached'installed'). Thatcloses the update-message path structurally, with no additional gating needed
in the message handler. The
activate-side admission-marker check isretained as defense in depth and now, if it is ever reached with no
marker present, returns immediately without pruning or claiming clients —
an unadmitted generation must not take control of any page either.
Duplicate-precache-request risk found by review (chatgpt-codex-connector +
cubic-dev-ai independently) and corrected without losing update signal:
VitePWA's
injectManifestglob independently discoversindex.html,offline.htmlandfavicon.svg— the same three files already listedexplicitly (with the deployment
BASEprefix) inPRECACHE_URLS. Verifiedempirically with a real production build: all three appear as duplicate
manifest entries resolving to the same absolute URLs, which
cache.addAll()rejects with
InvalidStateError. Combined with the install-rejection fixabove, this would have made every production install fail permanently.
An initial fix excluded these files from the injected manifest via
vite.config.ts, but review correctly pointed out this throws away theircontent-hash revision tracking — the exact signal that lets the browser
detect and install an update when only one of these files changes, without a
package.jsonversion bump. The final fix keeps the manifest untouched (fullrevision tracking preserved) and instead resolves + dedupes the URLs at
runtime in
sw.jsbefore they ever reachcache.addAll(), so the redundantrequest is removed without losing the update-detection signal. Re-built
production output and confirmed both properties hold: the manifest still
carries revision hashes for all three files, and the final precache list has
zero duplicates.
Non-goals
subsystem, no code overlap.
generation admission.
work.
gate is the intended scope.
Validation
tests/unit/serviceWorkerCacheOwnership.test.ts— 15/15 passing, proving thelifecycle directly against the real
install/activatehandlers runningagainst the actual
public/sw.jssource (Nodevmsandbox):addAll()causes the installwaitUntil()promise to reject;skipWaiting()is not called for a failed installation;skipWaiting();generation;
normally (no permanent stuck state), also asserting
clients.claim()stays uncalled through the markerless activate and fires exactly once
after the real successful recovery;
does not trigger a duplicate-request rejection — the fake cache's
addAll()mirrors realCache.addAll()semantics (rejects on resolved-URLcollision) rather than silently deduping, and this test was
mutation-tested by reverting the runtime dedup and confirming it fails
with the expected simulated
InvalidStateError.All existing foreign-cache-ownership assertions are unchanged.
pnpm run build) confirms the manifest still tracksrevisions for
index.html/offline.html/favicon.svgand the finalprecache list contains zero duplicate entries.
node scripts/dependency-state.mjs verify— fingerprint valid.node scripts/check-doc-metrics.mjs— passes (README test-count metricresynced via the authoritative
pnpm run sync:readmescript: 7644 -> 7650).pnpm run ci:prepush, run automatically by thepre-push hook) — passes.
Summary by Sourcery
Gate service-worker cache-generation cutover on successful precaching and preserve reliable update detection without duplicate precache requests.
Bug Fixes:
Documentation:
Tests:
Summary by CodeRabbit
Bug Fixes
Documentation