const addResourcesToCache = async (resources) => {
  const cache = await caches.open('v1');
  await cache.addAll(resources);
};

self.addEventListener('install', (event) => {
  event.waitUntil(addResourcesToCache(['/', '/index.html', '/style.css', '/app.js', '/image-list.js', '/star-wars-logo.jpg', '/gallery/bountyHunters.jpg', '/gallery/myLittleVader.jpg', '/gallery/snowTroopers.jpg']));
});