And Now You Understand Service Workers
summary
Builds a real, deployable Service Worker step‑by‑step, shows the exact code to register it and intercept fetch, and implements cache-first network-fallback, network-first cache-fallback and stale-while-revalidate strategies with versioned caches and pre‑caching. Claims a 6× page‑load speedup (5s → 750ms) by caching images, reports 0 MB network after cache hits, and covers Playwright tests, a rollback kill switch, and MSW integration so the example is production‑ready and automatable.
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chapters (12)
- 0:00Service workers intro
- 2:48Production-ready worker
- 7:03Cache-first fallback
- 9:09Static assets caching
- 10:31Offline support
- 11:56Cache invalidation
- 13:38Stale-while-revalidate
- 14:20Worker fears and fixes
- 17:28Kill switch deployment
- 19:33Testing worker reliability
- 20:15Resources
- 22:00Closing
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