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// In production, we register a service worker to serve assets from local cache. | ||
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// 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 the "N+1" visit to a page, since previously | ||
// cached resources are updated in the background. | ||
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// 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. | ||
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export default function register() { | ||
if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { | ||
window.addEventListener('load', () => { | ||
const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; | ||
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); | ||
}); | ||
}); | ||
} | ||
} | ||
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export function unregister() { | ||
if ('serviceWorker' in navigator) { | ||
navigator.serviceWorker.ready.then(registration => { | ||
registration.unregister(); | ||
}); | ||
} | ||
} |
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