55 lines
2.0 KiB
JavaScript
55 lines
2.0 KiB
JavaScript
// The build id is stamped into this file at production build time (see
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// stampServiceWorkerBuildId in vite.config.ts), so a deploy that changes only
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// the app bundle still changes sw.js byte-for-byte. That is what makes the
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// browser install a new worker, which — via skipWaiting + controllerchange —
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// reloads parked tabs onto the fresh bundle. Left as the literal placeholder in
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// dev, where HMR (not the worker) drives refreshes.
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const BUILD_ID = "__PAPERCLIP_BUILD_ID__";
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const CACHE_NAME = `paperclip-${BUILD_ID}`;
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self.addEventListener("install", () => {
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self.skipWaiting();
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});
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self.addEventListener("activate", (event) => {
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event.waitUntil(
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caches.keys().then((keys) =>
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Promise.all(keys.map((key) => caches.delete(key)))
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)
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);
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self.clients.claim();
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});
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self.addEventListener("fetch", (event) => {
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const { request } = event;
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const url = new URL(request.url);
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// Skip non-GET requests and API calls
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if (request.method !== "GET" || url.pathname.startsWith("/api")) {
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return;
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}
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// Network-first for everything — cache is only an offline fallback
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event.respondWith(
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fetch(request)
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.then((response) => {
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if (response.ok && url.origin === self.location.origin) {
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const clone = response.clone();
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caches.open(CACHE_NAME).then((cache) => cache.put(request, clone));
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}
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return response;
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})
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.catch(async () => {
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// caches.match() resolves undefined on a miss (and the promise itself
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// is always truthy, so `||` can never supply a fallback). respondWith
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// must always receive a real Response — resolving undefined breaks
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// the navigation with "Failed to convert value to 'Response'" instead
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// of showing anything.
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if (request.mode === "navigate") {
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return (await caches.match("/")) ?? new Response("Offline", { status: 503 });
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}
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return (await caches.match(request)) ?? Response.error();
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})
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);
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});
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