sw.js

var CACHE = 'ote-reader-v1';
var ASSETS = [
  './',
  './index.html',
  './styles.css',
  './app.js',
  './manifest.webmanifest',
  './demo-feed.json',
  './icon.svg'
];

self.addEventListener('install', function (event) {
  event.waitUntil(caches.open(CACHE).then(function (cache) {
    return cache.addAll(ASSETS);
  }));
});

self.addEventListener('activate', function (event) {
  event.waitUntil(caches.keys().then(function (keys) {
    return Promise.all(keys.filter(function (key) { return key !== CACHE; }).map(caches.delete));
  }));
});

self.addEventListener('fetch', function (event) {
  if (event.request.method !== 'GET') return;
  event.respondWith(fetch(event.request).catch(function () {
    return caches.match(event.request);
  }));
});