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+/* 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 { clientsClaim } from 'workbox-core';
+import { ExpirationPlugin } from 'workbox-expiration';
+import { precacheAndRoute, createHandlerBoundToURL } from 'workbox-precaching';
+import { registerRoute } from 'workbox-routing';
+import { StaleWhileRevalidate } from 'workbox-strategies';
+
+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.