Service Worker Skill

This skill covers service worker implementation patterns for offline support, intelligent caching, and Progressive Web App (PWA) functionality—without relying on Workbox or other abstractions.

Philosophy

Service workers should be:

1. Progressive - Enhance, don't break; site works without SW
2. Predictable - Clear caching strategies with versioned caches
3. Debuggable - Logging and clear update paths
4. Lightweight - Vanilla JS, no frameworks required

File Structure