Test service workers

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tree 2023-02-04 22:44:10 +01:00
parent c9f160a45c
commit f2bf563640
1 changed files with 61 additions and 0 deletions

61
src/service-worker.js Normal file
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import { build, files, version } from '$service-worker';
// Create a unique cache name for this deployment
const CACHE = `cache-${version}`;
const ASSETS = [
...build, // the app itself
...files // everything in `static`
];
self.addEventListener('install', (event) => {
// Create a new cache and add all files to it
async function addFilesToCache() {
const cache = await caches.open(CACHE);
await cache.addAll(ASSETS);
}
event.waitUntil(addFilesToCache());
});
self.addEventListener('activate', (event) => {
// Remove previous cached data from disk
async function deleteOldCaches() {
for (const key of await caches.keys()) {
if (key !== CACHE) await caches.delete(key);
}
}
event.waitUntil(deleteOldCaches());
});
self.addEventListener('fetch', (event) => {
// ignore POST requests etc
if (event.request.method !== 'GET') return;
async function respond() {
const url = new URL(event.request.url);
const cache = await caches.open(CACHE);
// `build`/`files` can always be served from the cache
if (ASSETS.includes(url.pathname)) {
return cache.match(event.request);
}
// for everything else, try the network first, but
// fall back to the cache if we're offline
try {
const response = await fetch(event.request);
if (response.status === 200) {
cache.put(event.request, response.clone());
}
return response;
} catch {
return cache.match(event.request);
}
}
event.respondWith(respond());
});