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53 lines
2.2 KiB
53 lines
2.2 KiB
// 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
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// it offline capabilities. However, it also means that developers (and users)
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// will only see deployed updates on the "N+1" visit to a page, since previously
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// 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.
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// This link also includes instructions on opting out of this behavior.
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export default function register() {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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window.addEventListener('load', () => {
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
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navigator.serviceWorker
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.register(swUrl)
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.then(registration => {
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// eslint-disable-next-line no-param-reassign
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registration.onupdatefound = () => {
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const installingWorker = registration.installing;
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installingWorker.onstatechange = () => {
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if (installingWorker.state === 'installed') {
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if (navigator.serviceWorker.controller) {
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// At this point, the old content will have been purged and
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// the fresh content will have been added to the cache.
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// It's the perfect time to display a "New content is
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// available; please refresh." message in your web app.
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console.log('New content is available; please refresh.'); // eslint-disable-line no-console
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} else {
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// At this point, everything has been precached.
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// It's the perfect time to display a
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// "Content is cached for offline use." message.
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console.log('Content is cached for offline use.'); // eslint-disable-line no-console
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}
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}
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};
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};
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})
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.catch(error => {
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console.error('Error during service worker registration:', error);
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});
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});
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}
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}
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export function unregister() {
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if ('serviceWorker' in navigator) {
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navigator.serviceWorker.ready.then(registration => {
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registration.unregister();
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});
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}
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}
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