Populating your cache

suggest change

After your service worker is registered, the browser will try to install & later activate the service worker.

Install event listener

this.addEventListener('install', function(event) {
    console.log('installed');
});

Caching

One can use this install event returned to cache the assets needed to run the app offline. Below example uses the cache api to do the same.

this.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open('v1').then(function(cache) {
      return cache.addAll([
        /* Array of all the assets that needs to be cached */
        '/css/style.css',
        '/js/app.js',
        '/images/snowTroopers.jpg'
      ]);
    })
  );
});

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