og-sw.js

// Install and activate the service worker
self.addEventListener('install', function(event) {
  console.log('SW installing...');
  event.waitUntil(
    caches.open('soundboard-cache-v1').then(function(cache) {
      return cache.addAll([
        '/',
        'index.html',
        'css/styles.css',
        'css/spinner.css',
        'img/mlg-favicon.png',
        'loader.js',
        'sounds.json'
      ]);
    })
  );
});

self.addEventListener('activate', function(event) {
  console.log('SW activating...');
});

// Intercept network requests and return cached responses
self.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request).then(function(response) {
      return response || fetch(event.request);
    })
  );
});