text: /* eslint-disable no-restricted-globals */
  
  // This service worker can be customized!
  // See https://developers.google.com/web/tools/workbox/modules
  // for the list of available Workbox modules, or add any other
  // code you'd like.
  // You can also remove this file if you'd prefer not to use a
  // service worker, and the Workbox build step will be skipped.
  
  import { precacheAndRoute, createHandlerBoundToURL } from 'workbox-precaching';
  import { StaleWhileRevalidate } from 'workbox-strategies';
  import { ExpirationPlugin } from 'workbox-expiration';
  import { registerRoute } from 'workbox-routing';
  import { clientsClaim } from 'workbox-core';
  
  clientsClaim();
  
  // Precache all of the assets generated by your build process.
  // Their URLs are injected into the manifest variable below.
  // This variable must be present somewhere in your service worker file,
  // even if you decide not to use precaching. See https://cra.link/PWA
  precacheAndRoute(self.__WB_MANIFEST);
  
  // Set up App Shell-style routing, so that all navigation requests
  // are fulfilled with your index.html shell. Learn more at
  // https://developers.google.com/web/fundamentals/architecture/app-shell
  const fileExtensionRegexp = new RegExp('/[^/?]+\\.[^/]+$');
  
  registerRoute(
    // Return false to exempt requests from being fulfilled by index.html.
    ({ request, url }) => {
      // If this isn't a navigation, skip.
      if (request.mode !== 'navigate') {
        return false;
      } // If this is a URL that starts with /_, skip.
  
      if (url.pathname.startsWith('/_')) {
        return false;
      } // If this looks like a URL for a resource, because it contains // a file extension, skip.
  
      if (url.pathname.match(fileExtensionRegexp)) {
        return false;
      } // Return true to signal that we want to use the handler.
  
      return true;
    },
    createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html')
  );
  
  // An example runtime caching route for requests that aren't handled by the
  // precache, in this case same-origin .png requests like those from in public/
  registerRoute(
    // Add in any other file extensions or routing criteria as needed.
    ({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'),
    // Customize this strategy as needed, e.g., by changing to CacheFirst.
    new StaleWhileRevalidate({
      cacheName: 'images',
      plugins: [
        // Ensure that once this runtime cache reaches a maximum size the
        // least-recently used images are removed.
        new ExpirationPlugin({ maxEntries: 50 })
      ]
    })
  );
  
  // This allows the web app to trigger skipWaiting via
  // registration.waiting.postMessage({type: 'SKIP_WAITING'})
  self.addEventListener('message', (event) => {
    if (event.data && event.data.type === 'SKIP_WAITING') {
      self.skipWaiting();
    }
  });
  
  // Any other custom service worker logic can go here.
  