sw.js

gistfile1.txt

importScripts('https://unpkg.com/[email protected]/build/importScripts/workbox-sw.dev.v0.0.2.js');
importScripts('https://unpkg.com/[email protected]/build/importScripts/workbox-google-analytics.prod.v1.0.0.js');

const workboxSW = new WorkboxSW({clientsClaim: true});

workbox.googleAnalytics.initialize();
workboxSW.router.registerRoute(
  /\.?!(html)$/,
  workboxSW.strategies.cacheFirst({
	  cacheName: 'assets',
	  cacheExpiration : {
		  maxEntries: 20,
		  maxAgeSeconds: 7 * 24 * 60 * 60
	  },
	  cacheableResponse: {statuses: [0, 200]}
  })
);

workboxSW.router.registerRoute(
  /\.html$/,
  workboxSW.strategies.networkFirst({networkTimeoutSeconds: 3})
);