use sveltekit approach to service worker setup

nwaughachukwuma · Dec 4, 2024 · 9ca5566 · 9ca5566
1 parent 0e3b000
commit 9ca5566
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Showing 4 changed files with 82 additions and 49 deletions.
diff --git a/app/src/app.html b/app/src/app.html
@@ -46,14 +46,6 @@
 
 <body class="h-full w-full overflow-hidden dark" data-sveltekit-preload-data="hover">
 	<div style="display: contents" class="w-full h-full">%sveltekit.body%</div>
-
-	<script>
-		if ('serviceWorker' in navigator) {
-			window.addEventListener('load', () => {
-				navigator.serviceWorker.register('/sw.js');
-			});
-		}
-	</script>
 </body>
 
 </html>
diff --git a/app/src/service-worker.js b/app/src/service-worker.js
@@ -0,0 +1,80 @@
+/// <reference types="@sveltejs/kit" />
+import { build, files, version } from '$service-worker';
+
+// Create a unique cache name for this deployment
+const CACHE = `cache-${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)) {
+			const response = await cache.match(url.pathname);
+
+			if (response) {
+				return response;
+			}
+		}
+
+		// 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 we're offline, fetch can return a value that is not a Response
+			// instead of throwing - and we can't pass this non-Response to respondWith
+			if (!(response instanceof Response)) {
+				throw new Error('invalid response from fetch');
+			}
+
+			if (response.status === 200) {
+				cache.put(event.request, response.clone());
+			}
+
+			return response;
+		} catch (err) {
+			const response = await cache.match(event.request);
+
+			if (response) {
+				return response;
+			}
+
+			// if there's no cache, then just error out
+			// as there is nothing we can do to respond to this request
+			throw err;
+		}
+	}
+
+	event.respondWith(respond());
+});
diff --git a/app/static/manifest.json b/app/static/manifest.json
@@ -11,7 +11,8 @@
     {
       "src": "/apple-touch-icon.png",
       "sizes": "152x152",
-      "type": "image/png"
+      "type": "image/png",
+      "purpose": "any maskable"
     }
   ],
   "screenshots": [

diff --git a/app/static/sw.js b/app/static/sw.js