text: const CACHE = "v1";
  
  importScripts(
    "https://storage.googleapis.com/workbox-cdn/releases/5.0.0/workbox-sw.js"
  );
  
  self.addEventListener("message", (event)=> {
    if (event.data && event.data.type === "SKIP_WAITING"){
      self.skipWaiting();
    }
  });
  
  workbox.routing.registerRoute(
    new RegExp('/*'),
    new workbox.strategies.StaleWhileRevalidate({
      cacheName: CACHE
    })
  )