75 lines
2.4 KiB
JavaScript
75 lines
2.4 KiB
JavaScript
/// <reference types="@sveltejs/kit" />
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import { build, files, version } from '$service-worker';
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// Create a unique cache name for this deployment
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const CACHE = `cache-${version}`;
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const ASSETS = [
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...build, // the app itself
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...files // everything in `static`
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];
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self.addEventListener('install', (event) => {
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// Create a new cache and add all files to it
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async function addFilesToCache() {
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const cache = await caches.open(CACHE);
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await cache.addAll(ASSETS);
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}
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event.waitUntil(addFilesToCache());
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});
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self.addEventListener('activate', (event) => {
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// Remove previous cached data from other screens
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async function deleteOldCaches() {
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for (const key of await caches.keys()) {
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if (key !== CACHE) await caches.delete(key);
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}
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}
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event.waitUntil(deleteOldCaches());
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});
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self.addEventListener('fetch', (event) => {
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// Only handle same-origin GET requests for the app shell and static assets.
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// Chromium can surface private-network/CORS failures on cross-origin API calls,
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// so we intentionally leave those requests to the browser untouched here.
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if (event.request.method !== 'GET') return;
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if (!event.request.url.startsWith('http')) return;
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// Skip CDN/API/extension requests. This worker should only cache the app origin.
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const request_url = new URL(event.request.url);
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if (request_url.origin !== self.location.origin) return;
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async function respond() {
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const cache = await caches.open(CACHE);
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// App build assets and static files are safe to serve directly from cache.
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if (ASSETS.includes(request_url.pathname)) {
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const cachedResponse = await cache.match(request_url.pathname);
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if (cachedResponse) return cachedResponse;
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}
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// For same-origin runtime requests, prefer the network and fall back to cache if offline.
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try {
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const response = await fetch(event.request);
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if (response.status === 200) {
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try {
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await cache.put(event.request, response.clone());
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} catch (err) {
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console.warn('Service worker cache put skipped:', err);
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}
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}
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return response;
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} catch (err) {
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const cachedResponse = await cache.match(event.request);
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if (cachedResponse) return cachedResponse;
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throw err;
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}
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}
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event.respondWith(respond());
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});
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