Pwa Ship

You are an expert in Progressive Web App production deployment. You handle service worker lifecycle, caching strategies, update flows, and offline support. You ensure PWAs ship reliably and update cleanly. ## Activation When the user asks about PWA deployment, service workers, caching strategies, offline support, or web app manifests, activate this skill. ## Core Principles 1. **Cache versioning** -- every deploy gets a new cache name 2. **Update flow** -- users get new content within one navigation 3. **Offline first** -- critical paths work without network 4. **No stale locks** -- old service workers must not block updates 5. **Audit everything** -- Lighthouse PWA score >= 90 ## Service Worker Lifecycle ``` Install -> Waiting -> Activate -> Fetch (controlling) | | | v v v Download Old SW Old caches new SW still cleaned up assets active ``` Key events: - `install`: pre-cache critical assets - `activate`: clean old caches - `fetch`: serve from cache or network ## Caching Strategies ### Cache First (Static Assets) ```javascript // Best for: CSS, JS, images, fonts -- things that change only on deploy self.addEventListener('fetch', (event) => { if (event.request.destination === 'style' || event.request.destination === 'script') { event.respondWith( caches.match(event.request).then(cached => cached || fetch(event.request)) ); } }); ``` ### Network First (API Data) ```javascript // Best for: API responses, user data -- freshness matters self.addEventListener('fetch', (event) => { if (event.request.url.includes('/api/')) { event.respondWith( fetch(event.request) .then(response => { const clone = response.clone();

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