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/**
References:
1. https://developers.google.com/web/fundamentals/primers/service-workers
2. https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook
3. https://googlechrome.github.io/samples/service-worker/
4. https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers
5. https://serviceworke.rs/
*/
const RUNTIME = 'runtime';
self.skipWaiting();
self.addEventListener('fetch', (event) => {
if (event.request.url.startsWith(self.location.origin)) {
event.respondWith(
(async () => {
const cache = await caches.open(RUNTIME);
const cachedResponse = await cache.match(event.request);
const networkResponsePromise = fetch(event.request);
event.waitUntil(
(async () => {
const networkResponse = await networkResponsePromise;
await cache.put(event.request, networkResponse.clone());
})()
);
// Returned the cached response if we have one, otherwise return the network response.
return cachedResponse || networkResponsePromise;
})()
);
}
});
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