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feature/ssr-deployment
development feature/musik88-api feature/ssr-deployment main testing typescript
js 135 lines 4.83 KB
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1 // This optional code is used to register a service worker.
2 // register() is not called by default.
3
4 // This lets the app load faster on subsequent visits in production, and gives
5 // it offline capabilities. However, it also means that developers (and users)
6 // will only see deployed updates on subsequent visits to a page, after all the
7 // existing tabs open on the page have been closed, since previously cached
8 // resources are updated in the background.
9
10 // To learn more about the benefits of this model and instructions on how to
11 // opt-in, read http://bit.ly/CRA-PWA
12
13 const isLocalhost = Boolean(
14 window.location.hostname === 'localhost' ||
15 // [::1] is the IPv6 localhost address.
16 window.location.hostname === '[::1]' ||
17 // 127.0.0.1/8 is considered localhost for IPv4.
18 window.location.hostname.match(
19 /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
20 )
21 );
22
23 export function register(config) {
24 if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
25 // The URL constructor is available in all browsers that support SW.
26 const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
27 if (publicUrl.origin !== window.location.origin) {
28 // Our service worker won't work if PUBLIC_URL is on a different origin
29 // from what our page is served on. This might happen if a CDN is used to
30 // serve assets; see https://github.com/facebook/create-react-app/issues/2374
31 return;
32 }
33
34 window.addEventListener('load', () => {
35 const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
36
37 if (isLocalhost) {
38 // This is running on localhost. Let's check if a service worker still exists or not.
39 checkValidServiceWorker(swUrl, config);
40
41 // Add some additional logging to localhost, pointing developers to the
42 // service worker/PWA documentation.
43 navigator.serviceWorker.ready.then(() => {
44 console.log(
45 'This web app is being served cache-first by a service ' +
46 'worker. To learn more, visit http://bit.ly/CRA-PWA'
47 );
48 });
49 } else {
50 // Is not localhost. Just register service worker
51 registerValidSW(swUrl, config);
52 }
53 });
54 }
55 }
56
57 function registerValidSW(swUrl, config) {
58 navigator.serviceWorker
59 .register(swUrl)
60 .then(registration => {
61 registration.onupdatefound = () => {
62 const installingWorker = registration.installing;
63 if (installingWorker == null) {
64 return;
65 }
66 installingWorker.onstatechange = () => {
67 if (installingWorker.state === 'installed') {
68 if (navigator.serviceWorker.controller) {
69 // At this point, the updated precached content has been fetched,
70 // but the previous service worker will still serve the older
71 // content until all client tabs are closed.
72 console.log(
73 'New content is available and will be used when all ' +
74 'tabs for this page are closed. See http://bit.ly/CRA-PWA.'
75 );
76
77 // Execute callback
78 if (config && config.onUpdate) {
79 config.onUpdate(registration);
80 }
81 } else {
82 // At this point, everything has been precached.
83 // It's the perfect time to display a
84 // "Content is cached for offline use." message.
85 console.log('Content is cached for offline use.');
86
87 // Execute callback
88 if (config && config.onSuccess) {
89 config.onSuccess(registration);
90 }
91 }
92 }
93 };
94 };
95 })
96 .catch(error => {
97 console.error('Error during service worker registration:', error);
98 });
99 }
100
101 function checkValidServiceWorker(swUrl, config) {
102 // Check if the service worker can be found. If it can't reload the page.
103 fetch(swUrl)
104 .then(response => {
105 // Ensure service worker exists, and that we really are getting a JS file.
106 const contentType = response.headers.get('content-type');
107 if (
108 response.status === 404 ||
109 (contentType != null && contentType.indexOf('javascript') === -1)
110 ) {
111 // No service worker found. Probably a different app. Reload the page.
112 navigator.serviceWorker.ready.then(registration => {
113 registration.unregister().then(() => {
114 window.location.reload();
115 });
116 });
117 } else {
118 // Service worker found. Proceed as normal.
119 registerValidSW(swUrl, config);
120 }
121 })
122 .catch(() => {
123 console.log(
124 'No internet connection found. App is running in offline mode.'
125 );
126 });
127 }
128
129 export function unregister() {
130 if ('serviceWorker' in navigator) {
131 navigator.serviceWorker.ready.then(registration => {
132 registration.unregister();
133 });
134 }
135 }