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+// In production, we register a service worker to serve assets from local cache.
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+
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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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+
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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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+
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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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+ 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.');
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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.');
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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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+
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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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