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feat: Implement PWA Background Sync with offline queue#555

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OlufunbiIK merged 1 commit into
OlufunbiIK:mainfrom
od-hunter:feature/pwa-background-sync
Apr 27, 2026
Merged

feat: Implement PWA Background Sync with offline queue#555
OlufunbiIK merged 1 commit into
OlufunbiIK:mainfrom
od-hunter:feature/pwa-background-sync

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@od-hunter
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Closes #449

- Add IndexedDB-based offline queue manager (offlineQueue.ts)
- Implement real background sync in service worker (sw.js)
- Add integration utilities for app layer (serviceWorker.ts)
- Create comprehensive unit tests (20 tests)
- Add duplicate protection via idempotency keys
- Implement priority-based queue replay
- Add retry logic with configurable max retries
- Persist replay metadata for debugging
- Add UI notifications for sync status
- Support graceful degradation for browsers without background sync

Core Features:
- Offline actions queue locally in IndexedDB
- Replay metadata persisted with full history
- Sync failures surface to UI via events and notifications
- Notification click routing to sync status page
- Concurrent replay prevention
- Fetch timeout (30s) to prevent hanging
- Auth token support via headers

Documentation:
- Complete implementation guide
- Quick start guide (5-minute integration)
- Validation checklist with test scenarios
- Integration examples with React hooks
- Bug analysis and fixes applied

Fixes:
- Add IndexedDB upgrade handler in service worker
- Add concurrent replay prevention
- Add fetch timeout with AbortController
- Replace deprecated substr() with substring()

Closes #[issue-number] - PWA Background Sync Completion
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Reviewing files that changed from the base of the PR and between bdda6cb and 95c540a.

📒 Files selected for processing (16)
  • BUGS_FIXED.md
  • BUG_ANALYSIS_AND_FIXES.md
  • IMPLEMENTATION_CHECKLIST.md
  • OFFLINE_QUEUE_INDEX.md
  • OFFLINE_QUEUE_PR_SUMMARY.md
  • PWA_BACKGROUND_SYNC_COMPLETE.md
  • frontend/OFFLINE_QUEUE_GUIDE.md
  • frontend/OFFLINE_QUEUE_IMPLEMENTATION_SUMMARY.md
  • frontend/OFFLINE_QUEUE_QUICK_START.md
  • frontend/OFFLINE_QUEUE_README.md
  • frontend/OFFLINE_QUEUE_VALIDATION.md
  • frontend/public/sw.js
  • frontend/src/utils/__tests__/offlineQueue.test.ts
  • frontend/src/utils/offlineQueue.ts
  • frontend/src/utils/offlineQueueIntegration.example.ts
  • frontend/src/utils/serviceWorker.ts
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@OlufunbiIK OlufunbiIK merged commit 7a0a10d into OlufunbiIK:main Apr 27, 2026
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PWA Background Sync Completion

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