update to 0.2.0,

format registerServiceWorker.js

package.json

@@ -1,6 +1,6 @@
 {
   "name": "todolist",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "private": true,
   "description": "",
   "main": "app.js",

react/package.json

@@ -1,6 +1,5 @@
 {
   "name": "todolist-web",
-  "version": "0.1.0",
   "private": true,
   "dependencies": {
     "@material-ui/core": "^1.3.1",

react/src/registerServiceWorker.js

@@ -8,11 +8,72 @@
 // 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' ||
+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}$/));
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/,
+    ),
+);
+
+function registerValidSW(swUrl) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      // eslint-disable-next-line no-param-reassign
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the old content will have been purged and
+              // the fresh content will have been added to the cache.
+              // It's the perfect time to display a "New content is
+              // available; please refresh." message in your web app.
+              console.log('New content is available; please refresh.');
+            } 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.');
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl) {
+  // 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.
+      if (
+        response.status === 404 ||
+        response.headers.get('content-type').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();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.',
+      );
+    });
+}
 
 export default function register() {
   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
@@ -35,8 +96,10 @@ export default function register() {
         // 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 ' +
+          console.log(
-              'worker. To learn more, visit https://goo.gl/SC7cgQ');
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://goo.gl/SC7cgQ',
+          );
         });
       } else {
         // Is not local host. Just register service worker
@@ -46,63 +109,9 @@ export default function register() {
   }
 }
 
-function registerValidSW(swUrl) {
-  navigator.serviceWorker
-    .register(swUrl)
-    .then((registration) => {
-      registration.onupdatefound = () => {
-        const installingWorker = registration.installing;
-        installingWorker.onstatechange = () => {
-          if (installingWorker.state === 'installed') {
-            if (navigator.serviceWorker.controller) {
-              // At this point, the old content will have been purged and
-              // the fresh content will have been added to the cache.
-              // It's the perfect time to display a "New content is
-              // available; please refresh." message in your web app.
-              console.log('New content is available; please refresh.');
-            } 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.');
-            }
-          }
-        };
-      };
-    })
-    .catch((error) => {
-      console.error('Error during service worker registration:', error);
-    });
-}
-
-function checkValidServiceWorker(swUrl) {
-  // 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.
-      if (
-        response.status === 404 ||
-        response.headers.get('content-type').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();
-          });
-        });
-      } else {
-        // Service worker found. Proceed as normal.
-        registerValidSW(swUrl);
-      }
-    })
-    .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) => {
+    navigator.serviceWorker.ready.then(registration => {
       registration.unregister();
     });
   }