f

public/sw.js

@@ -0,0 +1,42 @@
+const CACHE_NAME = 'global-counter-v1';
+const ASSETS = [
+    '/',
+    '/index.html',
+    '/style.css',
+    '/client.js',
+    '/icon.png',
+    '/manifest.json'
+];
+
+self.addEventListener('install', (event) => {
+    event.waitUntil(
+        caches.open(CACHE_NAME)
+            .then((cache) => cache.addAll(ASSETS))
+    );
+});
+
+self.addEventListener('fetch', (event) => {
+    // For Socket.io or Admin, go to network
+    if (event.request.url.includes('/socket.io/') || event.request.url.includes('/admin')) {
+        return;
+    }
+
+    event.respondWith(
+        caches.match(event.request)
+            .then((response) => response || fetch(event.request))
+    );
+});
+
+self.addEventListener('activate', (event) => {
+    event.waitUntil(
+        caches.keys().then((cacheNames) => {
+            return Promise.all(
+                cacheNames.map((cacheName) => {
+                    if (cacheName !== CACHE_NAME) {
+                        return caches.delete(cacheName);
+                    }
+                })
+            );
+        })
+    );
+});