workout/public/sw.js

const CACHE_NAME = "workout-cool-v1";
const urlsToCache = [
  "/",
  "/manifest.json",
  "/images/favicon-32x32.png",
  "/images/favicon-16x16.png",
  "/apple-touch-icon.png",
  "/android-chrome-192x192.png",
  "/android-chrome-512x512.png",
];

// Install event - cache resources
self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      return cache.addAll(urlsToCache);
    }),
  );
});

// Fetch event - serve from cache when offline
self.addEventListener("fetch", (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      return response || fetch(event.request);
    }),
  );
});

// Activate event - clean up old caches
self.addEventListener("activate", (event) => {
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheName !== CACHE_NAME) {
            return caches.delete(cacheName);
          }
        }),
      );
    }),
  );
});