sw.js

const CACHE_NAME = "bookava-cache-v3"; // Cache version incremented
const urlsToCache = [
  "/",
  "index.html",
  // Note: The following external URLs are intentionally not cached
  // as they can cause the service worker installation to fail if the
  // resources are unavailable or return non-200 responses.
  // It's generally better to let the browser handle caching for these.
];

self.addEventListener("install", (event) => {
  event.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      console.log("Opened cache");
      return cache.addAll(urlsToCache);
    })
  );
});

self.addEventListener("activate", (event) => {
  var cacheWhitelist = [CACHE_NAME];
  event.waitUntil(
    caches.keys().then((cacheNames) => {
      return Promise.all(
        cacheNames.map((cacheName) => {
          if (cacheWhitelist.indexOf(cacheName) === -1) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});

self.addEventListener("fetch", (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      if (response) {
        return response;
      }
      return fetch(event.request);
    })
  );
});