Update Service Worker to new version immediately

src/registerServiceWorker.js

@@ -1,21 +1,11 @@
-// In production, we register a service worker to serve assets from local cache.
-
-// This lets the app load faster on subsequent visits in production, and gives
-// it offline capabilities. However, it also means that developers (and users)
-// will only see deployed updates on the "N+1" visit to a page, since previously
-// cached resources are updated in the background.
-
-// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
-// This link also includes instructions on opting out of this behavior.
-
 const isLocalhost = Boolean(
   window.location.hostname === "localhost" ||
-    // [::1] is the IPv6 localhost address.
-    window.location.hostname === "[::1]" ||
-    // 127.0.0.1/8 is considered localhost for IPv4.
-    window.location.hostname.match(
-      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
-    )
+  // [::1] is the IPv6 localhost address.
+  window.location.hostname === "[::1]" ||
+  // 127.0.0.1/8 is considered localhost for IPv4.
+  window.location.hostname.match(
+    /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+  )
 );
 
 export default function register() {
@@ -41,7 +31,7 @@ export default function register() {
         navigator.serviceWorker.ready.then(() => {
           console.log(
             "This web app is being served cache-first by a service " +
-              "worker. To learn more, visit https://goo.gl/SC7cgQ"
+            "worker. To learn more, visit https://goo.gl/SC7cgQ"
           );
         });
       } else {
@@ -56,19 +46,36 @@ function registerValidSW(swUrl) {
   navigator.serviceWorker
     .register(swUrl)
     .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // New content is available and will be used when all tabs for this page are closed.
+              console.log('New content is available; please refresh.');
 
-      registration.addEventListener('updatefound', () => {
-        const newWorker = registration.installing;
-        newWorker.addEventListener('statechange', () => {
-          if(newWorker.state==="installed"){
-            newWorker.postMessage({type: 'SKIP_WAITING'});
-          }
-        });
-      });
+              // Optionally, you can force the new content to be active immediately:
+              // Uncomment the line below to apply the new version immediately
+              window.location.reload();
 
+              // Notify the user of the update.
+              // You can customize this notification as needed.
+              // if (confirm('New version available. Refresh now?')) {
+              //   window.location.reload();
+              // }
+            } else {
+              // Content is cached for offline use.
+              console.log('Content is cached for offline use.');
+            }
+          }
+        };
+      };
     })
     .catch(error => {
-       console.error('Error during service worker registration:', error);
+      console.error('Error during service worker registration:', error);
     });
 }
 
@@ -77,9 +84,10 @@ function checkValidServiceWorker(swUrl) {
   fetch(swUrl)
     .then(response => {
       // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get("content-type");
       if (
         response.status === 404 ||
-        response.headers.get("content-type").indexOf("javascript") === -1
+        (contentType && contentType.indexOf("javascript") === -1)
       ) {
         // No service worker found. Probably a different app. Reload the page.
         navigator.serviceWorker.ready.then(registration => {