fix(pwa): flush pending state before a forced SW-update reload (DA-02)

[qnbs]

Summary

Part of the post-#512 deep audit program (DA-02, third slice after #513/DA-03 and #516/DA-01). register-sw.ts unconditionally reloaded the page on every controllerchange event. The project autosave in app/listenerMiddleware.ts debounces 1s after the last change and resets on every keystroke, so a user typing continuously has no durable copy of their in-flight edit until they pause — a reload landing inside that window discarded it. "The app auto-saves so a reload is safe" was an unverified assumption baked into a comment in both register-sw.ts and public/sw.js, not something the code actually guaranteed; verifying it found the assumption false under continuous typing. public/sw.js's copy of that comment is corrected in this PR too.

Design (current, after four review-correction rounds)

controllerchange fires on every open tab whenever any tab applies an SW update, not just the tab that triggered it. Only the currently visible tab flushes on controllerchange — a hidden/background tab defers instead. That is a heuristic, not a proof: a hidden tab's state usually isn't fresher than what's already persisted, but an async operation (e.g. an AI-generation thunk) completing after the tab was hidden can still produce genuinely newer state the best-effort hide-time flush never captured — tracked as residual risk class 2 in #518, not eliminated by deferring.

flushLatestState() retries against the store's current state (comparing only the slices actually persisted — project, versionControl, settings, not the whole root state) until a flush completes against state provably unchanged since, bounded to 5 attempts plus one guaranteed final flush, rather than trusting a single snapshot taken before the async write resolves. The whole flush is additionally bounded by an 8s timeout — an unbounded wait (e.g. queued behind another tab's exclusive Web Lock) would otherwise hang indefinitely on a bundle whose old caches are already pruned.

The reload always proceeds, regardless of flush outcome (success, failure, or timeout). By the time controllerchange fires, SW activation has already pruned every old-version cache, so staying on the old bundle already risks missing-chunk failures on any not-yet-loaded lazy view — deferring the reload on a flush failure (the original design) didn't actually protect anything.

A hidden tab that later becomes visible does not re-flush before reloading — index.tsx's own visibilitychange-triggered hide-time flush is best-effort (a failure there is only logged, not retried), so re-flushing this tab's possibly-stale copy on becoming visible again risks clobbering a fresher write made by whichever tab actually handled the update while this one was hidden. This is the same trade-off as above, not a separate one: neither choice is provably safe, and re-flushing risks the more severe failure mode (active data clobber vs. a missed but bounded edit).

Two supporting storage-layer fixes, load-bearing for the guarantees above: app/persistedStateFlush.ts now uses Promise.allSettled (not Promise.all) so a caller that reloads immediately after a rejection never tears down the page while the other save is still mid-write; IdbProjectStore#saveSlice now resolves on transaction.oncomplete (not request.onsuccess), so "the flush succeeded" actually means the write is durable, not merely accepted.

Known residual risk (tracked, not closed by this PR)

An external cross-check correctly identified that this design does not fully close every theoretical race, because a complete close requires real cross-tab writer coordination — out of scope for a local controllerchange handler. Tracked in #518: (1) visibilityState identifies the foreground tab, not the freshest snapshot — ordinary sequential tab-switching (not just simultaneous multi-window use) can trigger a stale-tab-overwrites-fresh-tab clobber, this is not a rare precondition; (2) the hidden-tab-becomes-visible path trusts a best-effort prior flush that can fail or miss a post-hide async mutation; (3) the final guaranteed flush narrows but doesn't mathematically eliminate the race window.

Precise framing, not a technical all-clear: risk frequency is substantially reduced from the original (any typing during a full 1s window, on every deploy, every tab) to a materially smaller set of preconditions — still ordinary usage for class (1), genuinely rarer for (2) and (3). The risk class — data-integrity / edit-loss — has not changed, and architecture-level closure has not been achieved; #518 explicitly tracks this as PARTIAL_MITIGATION, not TERMINAL, pending the broader cross-tab write-admission work already scoped beyond DA-02's narrow slice (referenced in #518 as the eventual authoritative closure path).

Test plan

• tests/unit/registerSwUpdateFlush.test.ts: visible-tab flush-then-reload ordering, always-reloads-regardless-of-flush-outcome, single-flight on duplicate controllerchange, defensive no-store-mounted case, hidden-tab-defers-then-reloads-without-reflushing, retry-until-stable flushing restricted to persisted slices, guaranteed final flush, bounded flush timeout
• tests/unit/persistedStateFlush.test.ts: Promise.allSettled waits for both saves to settle before rejecting
• tests/unit/services/storage/idbProjectStoreSaveSlice.test.ts: saveSlice resolves on transaction.oncomplete, not request.onsuccess
• Every behavioral assertion verified against the prior commit in its own review round — each genuinely fails without its corresponding fix
• Broader sweep of the existing IDB/storage test suite (dbService, storageService, encryption round-trips) confirms no regression to the shared saveSlice/flushPersistedState call sites
• pnpm run lint / pnpm run typecheck / targeted vitest — all green locally
• pnpm run ci:prepush — PASS

Summary by Sourcery

Protect in-flight edits during service-worker updates by flushing durable state before visible-tab reloads while preserving bounded recovery when persistence cannot complete.

Bug Fixes:

• Flush pending persisted state before reloading the visible tab after a service-worker controller change, while guaranteeing reload proceeds after success, failure, or timeout.
• Prevent data loss caused by treating IndexedDB request success as durable before the transaction commits.
• Prevent concurrent automatic snapshots from being started by overlapping project saves.

Enhancements:

• Retry pre-reload persistence when persisted state changes during an asynchronous flush, with a bounded retry budget and timeout.
• Defer service-worker reloads for hidden tabs and avoid re-flushing potentially stale state when they become visible.
• Ensure persistence coordinators and all state saves fully settle before destructive actions such as reloads.

Documentation:

• Correct service-worker documentation and comments to describe the bounded pre-reload flush mitigation and its residual cross-tab risk.
• Update README test-count metrics.

Tests:

• Add coverage for service-worker flush ordering, visibility handling, retry behavior, timeout handling, and reload behavior under failures.
• Add persistence coordinator, IndexedDB transaction durability, and automatic snapshot race tests.

Summary by CodeRabbit

• Bug Fixes
  • Improved reliability when saving project and settings data, ensuring writes complete before being reported as successful.
  • Service-worker updates now retry only when relevant persisted data changes, while allowing reloads to proceed after an 8-second timeout.
  • Improved handling of save failures and interrupted storage transactions.
• Documentation
  • Updated project documentation with the latest test coverage metrics.

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	812be32	Aug 26, 2026 · 20:57	21:00

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Reviewer's Guide

The PR prevents service-worker controllerchange reloads from discarding continuously typed edits by flushing each tab’s persisted state and awaiting completion before reload; failed flushes defer the reload. It adds focused ordering, failure, single-flight, and null-store tests, plus synchronized test-count documentation.

Sequence diagram for the service-worker update flush before reload

sequenceDiagram
participant ServiceWorker as ServiceWorker
participant Tab as BrowserTab
participant Store as appStoreRef
participant PersistedState as flushPersistedState
participant Browser as window
ServiceWorker->>Tab: controllerchange
Tab->>Tab: Start single-flight flushThenReload
Tab->>Store: current store
Store-->>Tab: getState()
Tab->>PersistedState: flushPersistedState(state)
PersistedState-->>Tab: flush complete
Tab->>Browser: reload()

Loading

Sequence diagram for deferred reload after a failed state flush

sequenceDiagram
participant ServiceWorker as ServiceWorker
participant Tab as BrowserTab
participant PersistedState as flushPersistedState
participant Logger as appLogger
participant Browser as window
ServiceWorker->>Tab: controllerchange
Tab->>PersistedState: flushPersistedState(state)
PersistedState-->>Tab: throws error
Tab->>Logger: error(...)
Note over Tab,Browser: Reload is deferred - in-memory edits remain active

Loading

File-Level Changes

Change	Details	Files
Protect pending in-memory edits before service-worker-driven reloads.	Added shared persisted-state flush and store-reference integration. Awaited the flush before reloading on controllerchange. Deferred reload and logged an error when persistence fails. Retained single-flight behavior for duplicate controllerchange events and allowed reload when no store is mounted.	register-sw.ts
Added regression coverage for the controllerchange flush lifecycle.	Verified flush-before-reload ordering. Verified failed flushes suppress reloads. Verified duplicate events trigger only one flush/reload. Verified the defensive no-store path.	tests/unit/registerSwUpdateFlush.test.ts
Updated existing service-worker test mocking to preserve the complete logger shape.	Changed the logger mock to extend the real module and include debug support.	tests/unit/registerSwCacheOwnership.test.ts
Synchronized documented test metrics with the added regression suite.	Updated test counts and file counts in the README badges, feature table, repository tree, and metrics section.	README.md

Possibly linked issues

• pwa(first-class): harden offline reliability, lifecycle, performance, install/update UX & browser-native AI #478: The PR directly implements the issue’s edit-loss prevention requirement by flushing state before controller-change reloads.
• #unknown: The PR adds pre-reload persistence flushing and failure-safe deferred reloads for Service Worker controller changes.

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[amazon-q-developer]

This PR successfully addresses a critical data loss scenario (DA-02) where service worker updates could discard in-flight edits during continuous typing. The implementation is sound and well-tested.

Key improvements:

• Service worker controllerchange now flushes pending state before reloading, preventing data loss during the 1-second autosave debounce window
• Failed flushes defer the reload rather than forcing it, ensuring edits remain in memory
• Single-flight pattern prevents duplicate reload attempts
• Comprehensive test coverage validates flush-then-reload ordering, error handling, and edge cases

Code quality:

• Clean implementation with appropriate error handling
• Defensive null guards for edge cases
• Well-documented with inline comments explaining the rationale
• Test coverage includes failure scenarios and boundary conditions

The fix is production-ready and correctly solves the stated problem without introducing new risks.

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🏁 CodeAnt Quality Gate Results

Commit:1e6c418d
Scan Time: 2026-08-27 00:42:03 UTC

✅ Overall Status: PASSED

Quality Gate Details

Quality Gate	Status	Details
Secrets	✅ PASSED	0 secrets found
Duplicate Code	✅ PASSED	0.0% duplicated
SAST	✅ PASSED	No security issues
Bugs	✅ PASSED	Rating S: No bugs
IAC	✅ PASSED	No IAC issues

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📝 Walkthrough

Walkthrough

The service-worker update path now defers hidden-tab reloads, flushes persisted state for visible tabs, retries when persisted slices change, and proceeds after flush failures or timeouts. Persistence and IndexedDB tests now cover settlement and transaction completion.

Changes

Service-worker update handling

Layer / File(s)	Summary
Complete persisted-state writes app/persistedStateFlush.ts, services/storage/idbProjectStore.ts, tests/unit/persistedStateFlush.test.ts, tests/unit/services/storage/idbProjectStoreSaveSlice.test.ts	Persistence waits for all saves to settle. IndexedDB saves resolve after transaction completion and reject on transaction errors or aborts.
Coordinate update reloads and persistence register-sw.ts	Hidden tabs defer reloads until visible. Visible tabs flush persisted state before reload. Retries compare persisted slices, use a five-attempt bound, and apply an 8-second timeout. Reloads continue after failures or timeouts.
Validate visibility and retry behavior tests/unit/registerSwUpdateFlush.test.ts	Tests cover visibility handling, single-flight behavior, latest-state retries, non-persisted changes, retry exhaustion, failures, and timeouts.
Align supporting mocks and project metrics tests/unit/registerSwCacheOwnership.test.ts, public/sw.js, README.md	The logger mock adds debug while retaining original exports. The service-worker comment removes the DA-02 label. README metrics report 7,151+ tests across 585 files.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk:⚪ Minimal · up to 21a9d

The PR flushes pending persisted edits before visible-tab service-worker reloads while preserving bounded reload recovery; no actionable merge-blocking risk remains after normal checks and review.

Sequence Diagram(s)

sequenceDiagram
participant ServiceWorker
participant Document
participant AppStore
participant Persistence
participant Browser
ServiceWorker->>Document: Detect controller change
alt Document is hidden
ServiceWorker->>Document: Defer reload
Document->>ServiceWorker: Become visible
else Document is visible
ServiceWorker->>AppStore: Read persisted state slices
AppStore->>Persistence: Flush persisted state
Persistence-->>ServiceWorker: Return success, failure, or timeout
ServiceWorker->>Browser: Reload
end

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

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Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 8 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: flushing pending state before a forced service-worker update reload.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 8 files. (1 skipped: 1 unsupported.)

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❌ Patch coverage is 98.00000% with 1 line in your changes missing coverage. Please review.

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Inline comments:
In `@register-sw.ts`:
- Around line 189-205: Update the QNBS-v3 annotations for the controller-change
and flush/reload logic in register-sw.ts#L189-L205 and register-sw.ts#L240-L264,
and for the related suite, visibility helpers, stable-state, hidden-tab, and
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Re-triggering CI — the previous push (daf44e1) never got a workflow run queued, matching a GitHub Actions incident (database failover) reported resolved today. Closing and reopening to force a fresh dispatch against the same commit.

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