service-worker.js

const cacheName = 'tether_cache-v2';
const precacheResources = [
	'/',
	'/offline/',
	'/404.html',
	'/fonts/Quantico400.woff2',
	'/fonts/Quantico700.woff2',
	'/fonts/Tulpen-One400.woff2',
	'/icons/favicon-16x16.png',
	'/tether_theme.mp3',
	'/libs/font-awesome.min.css',
	'/libs/fontawesome-webfont.woff'
];

// When the service worker is installing, open the cache and add the precache resources to it
self.addEventListener('install', (event) => {
  console.log('Service worker install event!');
  event.waitUntil(caches.open(cacheName).then((cache) => cache.addAll(precacheResources)));
});

self.addEventListener('activate', (event) => {
  console.log('Service worker activate event!');
});

// When there's an incoming fetch request, try and respond with a precached resource, otherwise fall back to the network
self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request).then((cachedResponse) => {
      if (cachedResponse) {
        return cachedResponse;
      }
      return fetch(event.request);
    }),
  );
});