old_contents: // Copyright 2019 Google Inc.
  //
  // 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
  //
  //      http://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.
  
  // CODELAB: Update cache names any time any of the cached files change.
  const CACHE_NAME = 'static-cache-v1';
  
  // CODELAB: Add list of files to cache here.
  const FILES_TO_CACHE = [
  ];
  
  self.addEventListener('install', (evt) => {
    console.log('[ServiceWorker] Install');
    // CODELAB: Precache static resources here.
  
    self.skipWaiting();
  });
  
  self.addEventListener('activate', (evt) => {
    console.log('[ServiceWorker] Activate');
    // CODELAB: Remove previous cached data from disk.
  
    self.clients.claim();
  });
  
  self.addEventListener('fetch', (evt) => {
    console.log('[ServiceWorker] Fetch', evt.request.url);
    // CODELAB: Add fetch event handler here.
  
  });
  
new_contents: /*
   * @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';
  
  // CODELAB: Update cache names any time any of the cached files change.
  const CACHE_NAME = 'static-cache-v1';
  
  // CODELAB: Add list of files to cache here.
  const FILES_TO_CACHE = [
  ];
  
  self.addEventListener('install', (evt) => {
    console.log('[ServiceWorker] Install');
    // CODELAB: Precache static resources here.
  
    self.skipWaiting();
  });
  
  self.addEventListener('activate', (evt) => {
    console.log('[ServiceWorker] Activate');
    // CODELAB: Remove previous cached data from disk.
  
    self.clients.claim();
  });
  
  self.addEventListener('fetch', (evt) => {
    console.log('[ServiceWorker] Fetch', evt.request.url);
    // CODELAB: Add fetch event handler here.
  
  });
  
subject: Update license & add strict