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// In production, we register a service worker to serve assets from local cache.
import webPushManager from './helpers/web-push-manager';
// 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.
// 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.
export type ServiceWorkerResult = {
newContent?: boolean,
firstCache?: boolean,
};
const IS_PROD = process.env.NODE_ENV === 'production';
const swUrl = IS_PROD
? `${process.env.PUBLIC_URL}/service-worker.js`
: `${process.env.PUBLIC_URL}/push-sw-v1.js`;
export default function register(): Promise<ServiceWorkerResult> {
if ('serviceWorker' in navigator) {
return new Promise(res => {
window.addEventListener('load', () => {
navigator.serviceWorker
.register(swUrl)
.then(registration => {
if ('PushManager' in window) {
webPushManager.set(registration.pushManager);
}
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.
res({ newContent: true });
} else {
// At this point, everything has been precached.
res({ firstCache: true });
}
}
};
};
})
.catch(error => {
console.error('Error during service worker registration:', error);
});
});
});
} else {
return Promise.resolve({});
}
}
export function unregister() {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready.then(registration => {
registration.unregister();
});
}
}
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