diff --git a/frontend/src/sw.ts b/frontend/src/sw.ts
new file mode 100644
index 0000000..5b711c2
--- /dev/null
+++ b/frontend/src/sw.ts
@@ -0,0 +1,67 @@
+///
+///
+///
+///
+
+import { build, files, version } from '$service-worker';
+
+// Create a unique cache name for this deployment
+const CACHE = `sw-cache-${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 POST requests etc
+ if (event.request.method !== 'GET') return;
+
+ async function respond() {
+ const url = new URL(event.request.url);
+ const cache = await caches.open(CACHE);
+
+ // `build`/`files` can always be served from the cache
+ if (ASSETS.includes(url.pathname)) {
+ return cache.match(url.pathname);
+ }
+
+ // for everything else, try the network first, but
+ // fall back to the cache if we're offline
+ try {
+ const response = await fetch(event.request);
+
+ if (response.status === 200) {
+ cache.put(event.request, response.clone());
+ }
+
+ return response;
+ } catch {
+ return cache.match(event.request);
+ }
+ }
+
+ event.respondWith(respond());
+});
+
diff --git a/frontend/svelte.config.js b/frontend/svelte.config.js
index 7fc2a19..b2e05dc 100644
--- a/frontend/svelte.config.js
+++ b/frontend/svelte.config.js
@@ -5,6 +5,9 @@ import { vitePreprocess } from '@sveltejs/kit/vite';
const config = {
preprocess: vitePreprocess(),
kit: {
+ files: {
+ serviceWorker: 'src/sw.ts',
+ },
adapter: adapter({
fallback: null,
precompress: true,