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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)) {
const response = await cache.match(url.pathname);
if (response) {
return response;
}
}
// 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 we're offline, fetch can return a value that is not a Response
// instead of throwing - and we can't pass this non-Response to respondWith
if (!(response instanceof Response)) {
throw new Error("invalid response from fetch");
}
if (response.status === 200) {
cache.put(event.request, response.clone());
}
return response;
} catch (err) {
const response = await cache.match(event.request);
if (response) {
return response;
}
// if there's no cache, then just error out
// as there is nothing we can do to respond to this request
throw err;
}
}
event.respondWith(respond());
});
self.addEventListener("push", (event) => {
const { title, body, url } = event.data.json();
const icon = "/images/icon.png";
const badge = "/images/badge.png";
self.registration.showNotification(title, {
body,
icon,
badge,
data: { url },
});
});
self.addEventListener("notificationclick", (event) => {
event.notification.close();
const url = event.notification.data.url || "/";
event.waitUntil(
clients
.matchAll({ type: "window", includeUncontrolled: true })
.then((clientList) => {
for (const client of clientList) {
if (client.url === url && "focus" in client) {
return client.focus();
}
}
if (clients.openWindow) {
return clients.openWindow(url);
}
}),
);
});
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