var cacheName = 'tempConverterShell';
 
var filesToCache = [
  './',
  './index.html',
  './sample.js',
  './sample.css'
];
 
self.addEventListener('install', function(event) {
  console.log('ServiceWorker installing');
  event.waitUntil(
    caches.open(cacheName).then(function(cache) {
      console.log('Service Worker caching app shell');
      return cache.addAll(filesToCache);
    })
  );
});
 
self.addEventListener('activate', function(event) {
  console.log('Service Worker activating');
  event.waitUntil(
    caches.keys().then(function(keyList) {
      return Promise.all(keyList.map(function(key) {
        if (key !== cacheName) {
          console.log('Service Worker removing old cache', key);
          return caches.delete(key);
        }
      }));
    })
  );
  return self.clients.claim();
});
 
self.addEventListener('fetch', function(event) {
  console.log('Service Worker fetching ', event.request.url);
  event.respondWith(
    caches.match(event.request).then(function(response) {
      return response || fetch(event.request);
    })
  );
});