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/// <reference types="@sveltejs/kit" />
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 non-GET requests
if (event.request.method !== "GET") return;
async function respond() {
const url = new URL(event.request.url);
const cache = await caches.open(CACHE);
// Check for a cached response
const cachedResponse = await cache.match(event.request);
// If cached, attempt a conditional request with `If-None-Match`
if (cachedResponse) {
const etag = cachedResponse.headers.get("ETag");
const fetchOptions = etag
? {
headers: {
"If-None-Match": etag,
},
}
: {};
try {
const networkResponse = await fetch(event.request, fetchOptions);
if (networkResponse.status === 200) {
// Update cache and return the new response
cache.put(event.request, networkResponse.clone());
return networkResponse;
}
if (networkResponse.status === 304) {
// Return cached response if not modified
return cachedResponse;
}
} catch (err) {
console.error("Network error:", err);
// Fall back to cached response if the network fails
return cachedResponse;
}
}
// If no cache, fetch the resource and store it if successful
try {
const networkResponse = await fetch(event.request);
if (networkResponse.status === 200) {
cache.put(event.request, networkResponse.clone());
}
return networkResponse;
} catch (err) {
console.error("Fetch failed and no cache available:", err);
throw err; // No fallback available
}
}
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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