61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
/// <reference types="@sveltejs/kit" />
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/// <reference no-default-lib="true"/>
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/// <reference lib="esnext" />
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/// <reference lib="webworker" />
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// Offline-first: the app shell and static assets are cached on install.
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// GitHub API calls are never cached (sync needs live data).
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import { build, files, version } from '$service-worker';
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const sw = self as unknown as ServiceWorkerGlobalScope;
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const CACHE = `papure-${version}`;
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const ASSETS = [...build, ...files, '/'];
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sw.addEventListener('install', (event) => {
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event.waitUntil(
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caches
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.open(CACHE)
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.then((c) => c.addAll(ASSETS))
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.then(() => sw.skipWaiting())
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);
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});
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sw.addEventListener('activate', (event) => {
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event.waitUntil(
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caches
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.keys()
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.then((keys) => Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k))))
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.then(() => sw.clients.claim())
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);
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});
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sw.addEventListener('fetch', (event) => {
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const req = event.request;
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if (req.method !== 'GET') return;
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const url = new URL(req.url);
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if (url.origin !== sw.location.origin) return;
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// Navigations: network first, fall back to the cached shell (SPA).
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if (req.mode === 'navigate') {
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event.respondWith(
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fetch(req).catch(async () => (await caches.match('/')) ?? Response.error())
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);
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return;
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}
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// Assets: cache first (they're versioned or fixed).
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event.respondWith(
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caches.match(req).then(
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(hit) =>
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hit ??
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fetch(req).then((res) => {
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if (res.ok && ASSETS.includes(url.pathname)) {
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const copy = res.clone();
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void caches.open(CACHE).then((c) => c.put(req, copy));
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}
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return res;
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})
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)
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);
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});
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