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January 4, 2024 09:01
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serviceWorkerRegistration.ts
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// Here is a reference snippet of code from src/serviceWorkerRegistration.ts | |
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}$/ | |
) | |
); | |
type Config = { | |
onSuccess?: (registration: ServiceWorkerRegistration) => void; | |
onUpdate?: (registration: ServiceWorkerRegistration) => void; | |
}; | |
export function register(config?: Config) { | |
if ("serviceWorker" in navigator) { | |
// The URL constructor is available in all browsers that support SW. | |
const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href); | |
console.log("publicUrl", publicUrl); | |
if (publicUrl.origin !== window.location.origin) { | |
// Our service worker won't work if PUBLIC_URL is on a different origin | |
// from what our page is served on. This might happen if a CDN is used to | |
// serve assets; see https://github.com/facebook/create-react-app/issues/2374 | |
return; | |
} | |
window.addEventListener("load", () => { | |
const swUrl = `${publicUrl}/serviceworker/sw.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://cra.link/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://cra.link/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); | |
}); | |
} | |
} |
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