service-worker.js

/*
 * @license
 * Your First PWA Codelab (https://g.co/codelabs/pwa)
 * Copyright 2019 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */

'use strict';

importScripts('https://storage.googleapis.com/workbox-cdn/releases/3.4.1/workbox-sw.js');

workbox.googleAnalytics.initialize();

// CODELAB: Update cache names any time any of the cached files change.

const CACHE_NAME = 'excalc-alpha-0.99';


// CODELAB: Add list of files to cache here.
const FILES_TO_CACHE = [
  '/',
  '/index.html',
  '/index.html?utm_source=pwa',
  '/scripts/app.js',
  '/scripts/install.js',
  '/styles/inline.css',
  '/images/add.svg',
  '/images/install.svg',
  '/images/sun.svg',
  '/images/moon.svg',
  '/images/favicon.ico',

];

self.addEventListener('install', (evt) => {
  console.log('[ServiceWorker] Install');
// CODELAB: Precache static resources here.
evt.waitUntil(
    caches.open(CACHE_NAME).then((cache) => {
      console.log('[ServiceWorker] Pre-caching offline page');
      return cache.addAll(FILES_TO_CACHE);
    })
);

  self.skipWaiting();
});

self.addEventListener('activate', (evt) => {
  console.log('[ServiceWorker] Activate');
// CODELAB: Remove previous cached data from disk.
evt.waitUntil(
    caches.keys().then((keyList) => {
      return Promise.all(keyList.map((key) => {
        if (key !== CACHE_NAME) {
          console.log('[ServiceWorker] Removing old cache', key);
          return caches.delete(key);
        }
      }));
    })
);

  self.clients.claim();
});

self.addEventListener('fetch', (evt) => {
  console.log('[ServiceWorker] Fetch', evt.request.url);
// CODELAB: Add fetch event handler here.

evt.respondWith(
    caches.open(CACHE_NAME).then((cache) => {
      return cache.match(evt.request)
          .then((response) => {
            return response || fetch(evt.request);
          });
    })
);





});