serviceworker.js

//https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook

const cacheName = 'serviceCache'

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(cacheName).then(function(cache) {
      return cache.addAll(
        []
      );
    })
  );
});

// self.addEventListener('activate', function(event) {
//   var cacheKeeplist = ['serviceCache'];

//   event.waitUntil(
//     caches.keys().then((keyList) => {
//       return Promise.all(keyList.map((key) => {
//         if (cacheKeeplist.indexOf(key) === -1) {
//           return caches.delete(key);
//         }
//       }));
//     })
//   );
// });

// self.addEventListener('fetch', function(event) {
//   if (event.request.method !== 'GET') { return }

//   if (
//     event.request.url.includes('amazon-adsystem') ||
//     event.request.url.includes('browser-sync') ||
//     event.request.url.includes('media-amazon') ||
//     event.request.url.includes('cloudflare-static') ||
//     event.request.url.includes('google-analytics') ) {
//     return false;
//   }

//   event.respondWith(
//     caches.open(cacheName).then(function(cache) {
//       return cache.match(event.request).then(function (response) {
//         return response || fetch(event.request).then(function(response) {
//           cache.put(event.request, response.clone());
//           return response;
//         });
//       });
//     })
//   );
// });