1  /* eslint-disable no-restricted-globals */
 2  
 3  // This service worker can be customized!
 4  // See https://developers.google.com/web/tools/workbox/modules
 5  // for the list of available Workbox modules, or add any other
 6  // code you'd like.
 7  // You can also remove this file if you'd prefer not to use a
 8  // service worker, and the Workbox build step will be skipped.
 9  
10  import { clientsClaim } from 'workbox-core';
11  import { ExpirationPlugin } from 'workbox-expiration';
12  import { precacheAndRoute, createHandlerBoundToURL } from 'workbox-precaching';
13  import { registerRoute } from 'workbox-routing';
14  import { StaleWhileRevalidate } from 'workbox-strategies';
15  
16  clientsClaim();
17  
18  // fix index.html not refreshing on new plebbit-react versions
19  registerRoute(
20    // match index.html
21    ({ url }) => url.pathname === '/',
22    // serve cached index.html first but revalidate in background
23    new StaleWhileRevalidate(),
24  );
25  
26  // Precache all of the assets generated by your build process.
27  // Their URLs are injected into the manifest variable below.
28  // This variable must be present somewhere in your service worker file,
29  // even if you decide not to use precaching. See https://cra.link/PWA
30  precacheAndRoute(self.__WB_MANIFEST);
31  
32  // Set up App Shell-style routing, so that all navigation requests
33  // are fulfilled with your index.html shell. Learn more at
34  // https://developers.google.com/web/fundamentals/architecture/app-shell
35  const fileExtensionRegexp = new RegExp('/[^/?]+\\.[^/]+$');
36  registerRoute(
37    // Return false to exempt requests from being fulfilled by index.html.
38    ({ request, url }) => {
39      // If this isn't a navigation, skip.
40      if (request.mode !== 'navigate') {
41        return false;
42      } // If this is a URL that starts with /_, skip.
43  
44      if (url.pathname.startsWith('/_')) {
45        return false;
46      } // If this looks like a URL for a resource, because it contains // a file extension, skip.
47  
48      if (url.pathname.match(fileExtensionRegexp)) {
49        return false;
50      } // Return true to signal that we want to use the handler.
51  
52      return true;
53    },
54    createHandlerBoundToURL(process.env.PUBLIC_URL + '/index.html'),
55  );
56  
57  // An example runtime caching route for requests that aren't handled by the
58  // precache, in this case same-origin .png requests like those from in public/
59  registerRoute(
60    // Add in any other file extensions or routing criteria as needed.
61    ({ url }) => url.origin === self.location.origin && url.pathname.endsWith('.png'), // Customize this strategy as needed, e.g., by changing to CacheFirst.
62    new StaleWhileRevalidate({
63      cacheName: 'images',
64      plugins: [
65        // Ensure that once this runtime cache reaches a maximum size the
66        // least-recently used images are removed.
67        new ExpirationPlugin({ maxEntries: 50 }),
68      ],
69    }),
70  );
71  
72  // This allows the web app to trigger skipWaiting via
73  // registration.waiting.postMessage({type: 'SKIP_WAITING'})
74  self.addEventListener('message', (event) => {
75    if (event.data && event.data.type === 'SKIP_WAITING') {
76      self.skipWaiting();
77    }
78  });
79  
80  // Any other custom service worker logic can go here.