worker.js

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

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open('v1').then(cache => {
      return cache.addAll([
        '/',
        'index.html',
        '/assets/js/layout.js',
        '/assets/css/site.css',
        '/assets/img/cards-large/cups01.jpg',
        '/assets/img/cards-large/cups02.jpg',
        '/assets/img/cards-large/cups03.jpg',
        '/assets/img/cards-large/cups04.jpg',
        '/assets/img/cards-large/cups05.jpg',
        '/assets/img/cards-large/cups06.jpg',
        '/assets/img/cards-large/cups07.jpg',
        '/assets/img/cards-large/cups08.jpg',
        '/assets/img/cards-large/cups09.jpg',
        '/assets/img/cards-large/cups10.jpg',
        '/assets/img/cards-large/cups11.jpg',
        '/assets/img/cards-large/cups12.jpg',
        '/assets/img/cards-large/cups13.jpg',
        '/assets/img/cards-large/cups14.jpg',
        '/assets/img/cards-large/maj00.jpg',
        '/assets/img/cards-large/maj01.jpg',
        '/assets/img/cards-large/maj02.jpg',
        '/assets/img/cards-large/maj03.jpg',
        '/assets/img/cards-large/maj04.jpg',
        '/assets/img/cards-large/maj05.jpg',
        '/assets/img/cards-large/maj06.jpg',
        '/assets/img/cards-large/maj07.jpg',
        '/assets/img/cards-large/maj08.jpg',
        '/assets/img/cards-large/maj09.jpg',
        '/assets/img/cards-large/maj10.jpg',
        '/assets/img/cards-large/maj11.jpg',
        '/assets/img/cards-large/maj12.jpg',
        '/assets/img/cards-large/maj13.jpg',
        '/assets/img/cards-large/maj14.jpg',
        '/assets/img/cards-large/maj15.jpg',
        '/assets/img/cards-large/maj16.jpg',
        '/assets/img/cards-large/maj17.jpg',
        '/assets/img/cards-large/maj18.jpg',
        '/assets/img/cards-large/maj19.jpg',
        '/assets/img/cards-large/maj20.jpg',
        '/assets/img/cards-large/maj21.jpg',
        '/assets/img/cards-large/pents01.jpg',
        '/assets/img/cards-large/pents02.jpg',
        '/assets/img/cards-large/pents03.jpg',
        '/assets/img/cards-large/pents04.jpg',
        '/assets/img/cards-large/pents05.jpg',
        '/assets/img/cards-large/pents06.jpg',
        '/assets/img/cards-large/pents07.jpg',
        '/assets/img/cards-large/pents08.jpg',
        '/assets/img/cards-large/pents09.jpg',
        '/assets/img/cards-large/pents10.jpg',
        '/assets/img/cards-large/pents11.jpg',
        '/assets/img/cards-large/pents12.jpg',
        '/assets/img/cards-large/pents13.jpg',
        '/assets/img/cards-large/pents14.jpg',
        '/assets/img/cards-large/swords01.jpg',
        '/assets/img/cards-large/swords02.jpg',
        '/assets/img/cards-large/swords03.jpg',
        '/assets/img/cards-large/swords04.jpg',
        '/assets/img/cards-large/swords05.jpg',
        '/assets/img/cards-large/swords06.jpg',
        '/assets/img/cards-large/swords07.jpg',
        '/assets/img/cards-large/swords08.jpg',
        '/assets/img/cards-large/swords09.jpg',
        '/assets/img/cards-large/swords10.jpg',
        '/assets/img/cards-large/swords11.jpg',
        '/assets/img/cards-large/swords12.jpg',
        '/assets/img/cards-large/swords13.jpg',
        '/assets/img/cards-large/swords14.jpg',
        '/assets/img/cards-large/wands01.jpg',
        '/assets/img/cards-large/wands02.jpg',
        '/assets/img/cards-large/wands03.jpg',
        '/assets/img/cards-large/wands04.jpg',
        '/assets/img/cards-large/wands05.jpg',
        '/assets/img/cards-large/wands06.jpg',
        '/assets/img/cards-large/wands07.jpg',
        '/assets/img/cards-large/wands08.jpg',
        '/assets/img/cards-large/wands09.jpg',
        '/assets/img/cards-large/wands10.jpg',
        '/assets/img/cards-large/wands11.jpg',
        '/assets/img/cards-large/wands12.jpg',
        '/assets/img/cards-large/wands13.jpg',
        '/assets/img/cards-large/wands14.jpg'
      ]);
    })
  );
});