time-convertor-ts

serviceWorker.ts (5290B)

---

 // This optional code is used to register a service worker.
 // register() is not called by default.
 
 // 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 subsequent visits to a page, after all the
 // existing tabs open on the page have been closed, since previously cached
 // resources are updated in the background.
 
 // To learn more about the benefits of this model and instructions on how to
 // opt-in, read https://bit.ly/CRA-PWA
 
 const isLocalhost = Boolean(
   window.location.hostname === "localhost" ||
     // [::1] is the IPv6 localhost address.
     window.location.hostname === "[::1]" ||
     // 127.0.0.0/8 are considered localhost for IPv4.
     window.location.hostname.match(
       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
     )
 );
 
 type Config = {
   onSuccess?: (registration: ServiceWorkerRegistration) => void;
   onUpdate?: (registration: ServiceWorkerRegistration) => void;
 };
 
 export function register(config?: 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);
     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;
     }
 
     window.addEventListener("load", () => {
       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 
       if (isLocalhost) {
         // This is running on localhost. Let's check if a service worker still exists or not.
         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);
       }
     });
   }
 }
 
 function registerValidSW(swUrl: string, config?: Config) {
   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) {
               // At this point, the updated precached content has been fetched,
               // but the previous service worker will still serve the older
               // content until all client tabs are closed.
               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);
               }
             } 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.");
 
               // Execute callback
               if (config && config.onSuccess) {
                 config.onSuccess(registration);
               }
             }
           }
         };
       };
     })
     .catch((error) => {
       console.error("Error during service worker registration:", error);
     });
 }
 
 function checkValidServiceWorker(swUrl: string, config?: Config) {
   // Check if the service worker can be found. If it can't reload the page.
   fetch(swUrl, {
     headers: { "Service-Worker": "script" },
   })
     .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 ||
         (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();
           });
         });
       } else {
         // Service worker found. Proceed as normal.
         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();
       })
       .catch((error) => {
         console.error(error.message);
       });
   }
 }