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13 KiB
1 line
13 KiB
4 years ago
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{"ast":null,"code":"// This optional code is used to register a service worker.\n// register() is not called by default.\n// This lets the app load faster on subsequent visits in production, and gives\n// it offline capabilities. However, it also means that developers (and users)\n// will only see deployed updates on subsequent visits to a page, after all the\n// existing tabs open on the page have been closed, since previously cached\n// resources are updated in the background.\n// To learn more about the benefits of this model and instructions on how to\n// opt-in, read https://bit.ly/CRA-PWA\nconst isLocalhost = Boolean(window.location.hostname === 'localhost' || // [::1] is the IPv6 localhost address.\nwindow.location.hostname === '[::1]' || // 127.0.0.0/8 are considered localhost for IPv4.\nwindow.location.hostname.match(/^127(?:\\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/));\nexport function register(config) {\n if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {\n // The URL constructor is available in all browsers that support SW.\n const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);\n\n if (publicUrl.origin !== window.location.origin) {\n // Our service worker won't work if PUBLIC_URL is on a different origin\n // from what our page is served on. This might happen if a CDN is used to\n // serve assets; see https://github.com/facebook/create-react-app/issues/2374\n return;\n }\n\n window.addEventListener('load', () => {\n const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;\n\n if (isLocalhost) {\n // This is running on localhost. Let's check if a service worker still exists or not.\n checkValidServiceWorker(swUrl, config); // Add some additional logging to localhost, pointing developers to the\n // service worker/PWA documentation.\n\n navigator.serviceWorker.ready.then(() => {\n console.log('This web app is being served cache-first by a service ' + 'worker. To learn more, visit https://bit.ly/CRA-PWA');\n });\n } else {\n // Is not localhost. Just register service worker\n registerValidSW(swUrl, config);\n }\n });\n }\n}\n\nfunction registerValidSW(swUrl, config) {\n navigator.serviceWorker.register(swUrl).then(registration => {\n registration.onupdatefound = () => {\n const installingWorker = registration.installing;\n\n if (installingWorker == null) {\n return;\n }\n\n installingWorker.onstatechange = () => {\n if (installingWorker.state === 'installed') {\n if (navigator.serviceWorker.controller) {\n // At this point, the updated precached content has been fetched,\n // but the previous service worker will still serve the older\n // content until all client tabs are closed.\n 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\n\n if (config && config.onUpdate) {\n config.onUpdate(registration);\n }\n } else {\n // At this point, everything has been precached.\n // It's the perfect time to display a\n // \"Content is cached for offline use.\" message.\n console.log('Content is cached for offline use.'); // Execute callback\n\n if (config && config.onSuccess) {\n config.onSuccess(registration);\n }\n }\n }\n };\n };\n }).catch(error => {\n console.error('Error during service worker registration:', error);\n });\n}\n\nfunction checkValidServiceWorker(swUrl, config) {\n // Check if the service worker can be found. If it can't reload the page.\n fetch(swUrl, {\n headers: {\n 'Service-Worker': 'script'\n }\n }).then(response => {\n // Ensure service worker exists, and that we really are getting a JS file.\n const contentType = response.headers.get('content-type');\n\n if (response
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