text: workbox.skipWaiting();
  workbox.clientsClaim();
  
  
  workbox.routing.registerRoute(
      new RegExp('https://hacker-news.firebaseio.com'),
      workbox.strategies.staleWhileRevalidate()
  );
  
  self.addEventListener('push', (event) => {
      const title = 'Get Started With Workbox';
      const options = {
          body: event.data.text()
      };
      event.waitUntil(self.registration.showNotification(title, options));
  });
  
  workbox.precaching.precacheAndRoute(self.__precacheManifest);