---
phase: 26-pwa-performance
plan: 00
subsystem: ui
tags: [pwa, service-worker, cache-first, idb, web-push, vitest, typescript]

# Dependency graph
requires: []
provides:
  - Cache-first service worker (nexus-v1) replacing old network-first paperclip-v2
  - Web push notification handler in service worker
  - BeforeInstallPromptEvent TypeScript type declaration
  - idb installed in @paperclipai/ui
  - web-push + @types/web-push installed in @paperclipai/server
  - Wave 0 test stubs for useOfflineQueue, useInstallPrompt, usePushNotifications, PullToRefresh
affects:
  - 26-pwa-performance (plans 01-04 depend on this foundation)

# Tech tracking
tech-stack:
  added: [idb@8.0.3, web-push@3.6.7, @types/web-push@3.6.4]
  patterns:
    - Cache-first strategy for static assets and navigation via service worker
    - it.todo() test stubs for Wave 0 scaffolding (Phase 21-25 convention)
    - @vitest-environment jsdom pragma for component test files

key-files:
  created:
    - ui/src/types/pwa.d.ts
    - ui/src/hooks/useOfflineQueue.test.ts
    - ui/src/hooks/useInstallPrompt.test.ts
    - ui/src/hooks/usePushNotifications.test.ts
    - ui/src/components/PullToRefresh.test.tsx
  modified:
    - ui/public/sw.js
    - ui/package.json
    - server/package.json
    - pnpm-lock.yaml

key-decisions:
  - "Cache name changed from paperclip-v2 to nexus-v1; activate event deletes all non-nexus-v1 caches to bust stale entries"
  - "API paths (/api/*) pass through without SW interception — network-only for all API traffic"
  - "Push event handler uses /android-chrome-192x192.png as default icon and /favicon-32x32.png as badge"

patterns-established:
  - "SW fetch handler: API passthrough first, then navigate cache-first, then static-extension cache-first, then passthrough"
  - "Wave 0 test stubs: minimal imports, it.todo() only, no mocks until implementation plans"

requirements-completed: [PWA-01, PWA-07, PERF-05]

# Metrics
duration: 5min
completed: 2026-04-02
---

# Phase 26 Plan 00: PWA Performance Foundation Summary

**Cache-first service worker with nexus-v1 cache, push/notificationclick handlers, idb + web-push installed, and 14 Wave 0 test stubs for PWA hooks and PullToRefresh**

## Performance

- **Duration:** 5 min
- **Started:** 2026-04-02T01:58:25Z
- **Completed:** 2026-04-02T02:01:00Z
- **Tasks:** 2
- **Files modified:** 9

## Accomplishments

- Rewrote service worker from network-first (paperclip-v2) to cache-first (nexus-v1) strategy enabling PERF-05
- Added push and notificationclick event handlers to the service worker for web push notifications
- Created BeforeInstallPromptEvent TypeScript types for upcoming useInstallPrompt hook
- Installed idb@8.0.3 and web-push@3.6.7 dependencies for Phase 26 plans
- Created 4 Wave 0 test stub files with 14 it.todo() entries covering all PWA hooks and PullToRefresh component

## Task Commits

1. **Task 1: Install dependencies, create PWA types, and rewrite service worker** - `95ebf3d8` (feat)
2. **Task 2: Create Wave 0 test stubs for Phase 26 hooks and components** - `8e7a3e2b` (test)

## Files Created/Modified

- `ui/public/sw.js` - Rewritten: cache-first strategy with nexus-v1 cache, push and notificationclick handlers
- `ui/src/types/pwa.d.ts` - Created: BeforeInstallPromptEvent interface and WindowEventMap augmentation
- `ui/src/hooks/useOfflineQueue.test.ts` - Created: 4 it.todo() stubs
- `ui/src/hooks/useInstallPrompt.test.ts` - Created: 4 it.todo() stubs
- `ui/src/hooks/usePushNotifications.test.ts` - Created: 3 it.todo() stubs
- `ui/src/components/PullToRefresh.test.tsx` - Created: 3 it.todo() stubs with @vitest-environment jsdom
- `ui/package.json` - Added idb dependency
- `server/package.json` - Added web-push + @types/web-push dependencies
- `pnpm-lock.yaml` - Updated lockfile

## Decisions Made

- Cache name nexus-v1 replaces paperclip-v2; activate event deletes all caches with names not equal to nexus-v1 to bust stale versions
- API requests (/api/*) are excluded from SW interception entirely (network-only)
- Push handler defaults: icon=/android-chrome-192x192.png, badge=/favicon-32x32.png

## Deviations from Plan

None - plan executed exactly as written.

One minor cleanup: a comment in sw.js initially contained "paperclip-v2" as a reference. Removed the word to satisfy acceptance criteria (`grep "paperclip" ui/public/sw.js` returns 0).

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Service worker foundation ready for Phase 26 plans 01-04
- idb available for useOfflineQueue hook implementation (plan 01)
- web-push available for push subscription API (plan 03)
- All Wave 0 test stubs provide TDD RED targets for subsequent implementation plans
- 14 todos confirmed passing in vitest run (todos are not failures)

## Self-Check: PASSED

All created files verified:
- FOUND: ui/public/sw.js
- FOUND: ui/src/types/pwa.d.ts
- FOUND: ui/src/hooks/useOfflineQueue.test.ts
- FOUND: ui/src/hooks/useInstallPrompt.test.ts
- FOUND: ui/src/hooks/usePushNotifications.test.ts
- FOUND: ui/src/components/PullToRefresh.test.tsx
- FOUND: .planning/phases/26-pwa-performance/26-00-SUMMARY.md

All commits verified:
- FOUND: 95ebf3d8 (Task 1)
- FOUND: 8e7a3e2b (Task 2)

---
*Phase: 26-pwa-performance*
*Completed: 2026-04-02*