Use custom service worker with Workbox

package.json

@@ -22,11 +22,15 @@
     "husky": "3.1.0",
     "prettier": "1.19.1",
     "pretty-quick": "2.0.1",
-    "react-scripts": "3.2.0"
+    "react-scripts": "3.2.0",
+    "workbox-build": "^4.3.1",
+    "workbox-cli": "^4.3.1"
   },
   "scripts": {
     "start": "react-scripts start",
-    "build": "react-scripts build",
+    "build": "react-scripts build && yarn service-worker",
+    "service-worker": "workbox copyLibraries build/workbox 6& yarn update-sw",
+    "update-sw": "workbox injectManifest workbox.config.js",
     "test": "react-scripts test --verbose",
     "lint": "eslint src",
     "eject": "react-scripts eject"

src/index.js

@@ -17,7 +17,5 @@ ReactDOM.render(
   document.getElementById('root')
 )
 
-// If you want your app to work offline and load faster, you can change
-// unregister() to register() below. Note this comes with some pitfalls.
 // Learn more about service workers: https://bit.ly/CRA-PWA
-serviceWorker.unregister()
+serviceWorker.register()

src/service-worker-template.js

@@ -0,0 +1,38 @@
+/* eslint-disable no-restricted-globals, no-undef */
+
+// See Workbox docs in https://developers.google.com/web/tools/workbox/modules/workbox-sw
+
+self.importScripts('/workbox/workbox-v4.3.1/workbox-sw.js')
+
+workbox.setConfig({ modulePathPrefix: '/workbox/workbox-v4.3.1' })
+//self.workbox.logLevel = self.workbox.LOG_LEVEL.verbose;
+
+self.addEventListener('install', event => event.waitUntil(self.skipWaiting()))
+self.addEventListener('activate', event =>
+  event.waitUntil(self.clients.claim())
+)
+
+// GENERATED FILES ARE INJECTED HERE BY build-service-worker.js
+workbox.precaching.precacheAndRoute([])
+
+// API calls precache
+workbox.precaching.precacheAndRoute([
+  'https://pof-backend-staging.partio.fi/spn-ohjelma-json-taysi/?postGUID=86b5b30817ce3649e590c5059ec88921',
+  'https://pof-backend-staging.partio.fi/tag-translations-json/',
+])
+
+// app-shell
+workbox.routing.registerRoute('/', new workbox.strategies.NetworkFirst())
+
+// webfont-cache
+const webFontHandler = new workbox.strategies.CacheFirst({
+  cacheName: 'webfont-cache',
+  cacheExpiration: {
+    maxEntries: 20,
+  },
+  cacheableResponse: { statuses: [0, 200] },
+})
+workbox.routing.registerRoute(
+  /https:\/\/fonts.googleapis.com\/.*/,
+  webFontHandler
+)

src/serviceWorker.js

@@ -18,39 +18,39 @@ const isLocalhost = Boolean(
     window.location.hostname.match(
       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
     )
-);
+)
 
 export function register(config) {
   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
     // The URL constructor is available in all browsers that support SW.
-    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href)
     if (publicUrl.origin !== window.location.origin) {
       // Our service worker won't work if PUBLIC_URL is on a different origin
       // from what our page is served on. This might happen if a CDN is used to
       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
-      return;
+      return
     }
 
     window.addEventListener('load', () => {
-      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker-default.js`
 
       if (isLocalhost) {
         // This is running on localhost. Let's check if a service worker still exists or not.
-        checkValidServiceWorker(swUrl, config);
+        checkValidServiceWorker(swUrl, config)
 
         // Add some additional logging to localhost, pointing developers to the
         // service worker/PWA documentation.
         navigator.serviceWorker.ready.then(() => {
           console.log(
             'This web app is being served cache-first by a service ' +
               'worker. To learn more, visit https://bit.ly/CRA-PWA'
-          );
-        });
+          )
+        })
       } else {
         // Is not localhost. Just register service worker
-        registerValidSW(swUrl, config);
+        registerValidSW(swUrl, config)
       }
-    });
+    })
   }
 }
 
@@ -59,9 +59,9 @@ function registerValidSW(swUrl, config) {
     .register(swUrl)
     .then(registration => {
       registration.onupdatefound = () => {
-        const installingWorker = registration.installing;
+        const installingWorker = registration.installing
         if (installingWorker == null) {
-          return;
+          return
         }
         installingWorker.onstatechange = () => {
           if (installingWorker.state === 'installed') {
@@ -72,64 +72,64 @@ function registerValidSW(swUrl, config) {
               console.log(
                 'New content is available and will be used when all ' +
                   'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
-              );
+              )
 
               // Execute callback
               if (config && config.onUpdate) {
-                config.onUpdate(registration);
+                config.onUpdate(registration)
               }
             } else {
               // At this point, everything has been precached.
               // It's the perfect time to display a
               // "Content is cached for offline use." message.
-              console.log('Content is cached for offline use.');
+              console.log('Content is cached for offline use.')
 
               // Execute callback
               if (config && config.onSuccess) {
-                config.onSuccess(registration);
+                config.onSuccess(registration)
               }
             }
           }
-        };
-      };
+        }
+      }
     })
     .catch(error => {
-      console.error('Error during service worker registration:', error);
-    });
+      console.error('Error during service worker registration:', error)
+    })
 }
 
 function checkValidServiceWorker(swUrl, config) {
   // Check if the service worker can be found. If it can't reload the page.
   fetch(swUrl)
     .then(response => {
       // Ensure service worker exists, and that we really are getting a JS file.
-      const contentType = response.headers.get('content-type');
+      const contentType = response.headers.get('content-type')
       if (
         response.status === 404 ||
         (contentType != null && contentType.indexOf('javascript') === -1)
       ) {
         // No service worker found. Probably a different app. Reload the page.
         navigator.serviceWorker.ready.then(registration => {
           registration.unregister().then(() => {
-            window.location.reload();
-          });
-        });
+            window.location.reload()
+          })
+        })
       } else {
         // Service worker found. Proceed as normal.
-        registerValidSW(swUrl, config);
+        registerValidSW(swUrl, config)
       }
     })
     .catch(() => {
       console.log(
         'No internet connection found. App is running in offline mode.'
-      );
-    });
+      )
+    })
 }
 
 export function unregister() {
   if ('serviceWorker' in navigator) {
     navigator.serviceWorker.ready.then(registration => {
-      registration.unregister();
-    });
+      registration.unregister()
+    })
   }
 }

workbox.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  globDirectory: './build/',
+  globPatterns: ['**/*.{html,js,css,png,jpg,json}'],
+  globIgnores: [
+    'service-worker-default.js',
+    'service-worker.js',
+    'workbox-sw.js',
+    'index.html',
+  ],
+  swSrc: './src/service-worker-template.js',
+  swDest: './build/service-worker-default.js',
+}