KTVManager_UI/static/service-worker.js

const CACHE_NAME = 'ktvmanager-cache-v1';
const urlsToCache = [
  '/',
  '/static/styles.css',
  '/static/favicon.ico',
  '/static/favicon-96x96.png',
  '/static/favicon.svg',
  '/static/apple-touch-icon.png',
  '/static/web-app-manifest-192x192.png',
  '/static/web-app-manifest-512x512.png',
  '/static/site.webmanifest'
];

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(function(cache) {
        console.log('Opened cache');
        return cache.addAll(urlsToCache);
      })
  );
});

self.addEventListener('push', function(event) {
  const data = event.data.json();
  const options = {
    body: data.body,
    icon: '/static/web-app-manifest-192x192.png',
    badge: '/static/favicon-96x96.png'
  };

  event.waitUntil(
    self.registration.showNotification(data.title, options)
  );
});

self.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request)
      .then(function(response) {
        if (response) {
          return response;
        }
        return fetch(event.request);
      }
    )
  );
});