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Filename : sw.js

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const CACHE_NAME = 'crypto-calc-v1';
const urlsToCache = [
  './',
  './index.html',
  './manifest.json'
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => cache.addAll(urlsToCache))
  );
});

self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request)
      .then(response => response || fetch(event.request))
  );
});