Mini-Blackjack/serviceWorker.js at master · erfanpaslar/Mini-Blackjack · GitHub

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const staticDevCache = 'dev-mini-blackjack-v1';
const assert = [
  "/",
  "/index.html",
  "/main.js",
  "/styles.js",
  "/blackjackIcon.png",
  "/images/icons/icon-48x48.png",
  "/images/icons/icon-72x72.png",
  "/images/icons/icon-96x96.png",
  "/images/icons/icon-128x128.png",
  "/images/icons/icon-144x144.png",
  "/images/icons/icon-152x152.png",
  "/images/icons/icon-192x192.png",
  "/images/icons/icon-384x384.png",
  "/images/icons/icon-512x512.png",
]

self.addEventListener("install", installEvent => {
  installEvent.waitUntil(
    caches.open(staticDevCache).then(cache => {
      cache.addAll(assert);
    })
  );
})

self.addEventListener("fetch", fetchEvent => {
  fetchEvent.respondWith(
    caches.match(fetchEvent.request).then(res => {
      return res || fetch(fetchEvent.request);
    })
  );
})