sw-demo.js

global => {
  'use strict';

  // Load the sw-toolbox library.
  importScripts('bower_components/sw-toolbox/sw-toolbox.js');

  // Turn on debug logging, visible in the Developer Tools' console.
  global.toolbox.options.debug = true;

  // By default, all requests will use the toolbox.networkFirst cache
  // strategy, and their responses will be stored in the default cache.
  global.toolbox.router.default = global.toolbox.networkFirst;

  // Boilerplate to ensure our service worker takes control of the page as soon
  // as possible.
  global.addEventListener('install',
      event => event.waitUntil(global.skipWaiting()));
  global.addEventListener('activate',
      event => event.waitUntil(global.clients.claim()));
})(self);