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pixelfed/public/sw.js

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const OFFLINE_VERSION = 1;
const CACHE_NAME = "offline";
const OFFLINE_URL = "/offline.html";
self.addEventListener("install", (event) => {
event.waitUntil(
(async () => {
const cache = await caches.open(CACHE_NAME);
await cache.add(new Request(OFFLINE_URL, { cache: "reload" }));
})()
);
self.skipWaiting();
});
self.addEventListener("activate", (event) => {
event.waitUntil(
(async () => {
if ("navigationPreload" in self.registration) {
await self.registration.navigationPreload.enable();
}
})()
);
self.clients.claim();
});
self.addEventListener("fetch", (event) => {
if (event.request.mode === "navigate") {
event.respondWith(
(async () => {
try {
const preloadResponse = await event.preloadResponse;
if (preloadResponse) {
return preloadResponse;
}
const networkResponse = await fetch(event.request);
return networkResponse;
} catch (error) {
const cache = await caches.open(CACHE_NAME);
const cachedResponse = await cache.match(OFFLINE_URL);
return cachedResponse;
}
})()
);
}
});