var cacheName = 'alik-pwa';

 var filesToCache = [

   './',

   './index.html',

   './alik.js',

   './alik_bg.wasm',

 ];

 /* Start the service worker and cache all of the app's content */

 self.addEventListener('install', function (e) {

   e.waitUntil(

     caches.open(cacheName).then(function (cache) {

       return cache.addAll(filesToCache);

     })

   );

 });

 /* Serve cached content when offline */

 self.addEventListener('fetch', function (e) {

   e.respondWith(

     caches.match(e.request).then(function (response) {

       return response || fetch(e.request);

     })

   );

 });