Aplikacja kelnera jako PWA

public/waiter/sw.js

@@ -1,3 +1,5 @@
+const START_URL = './index.php';
+
 self.addEventListener('install', (event) => {
   event.waitUntil(self.skipWaiting());
 });
@@ -6,6 +8,27 @@ self.addEventListener('activate', (event) => {
   event.waitUntil(self.clients.claim());
 });
 
+self.addEventListener('fetch', (event) => {
+  event.respondWith(fetch(event.request));
+});
+
+self.addEventListener('notificationclick', (event) => {
+  event.notification.close();
+  event.waitUntil(
+    clients.matchAll({ type: 'window', includeUncontrolled: true }).then((list) => {
+      for (const client of list) {
+        if ('focus' in client) {
+          return client.focus();
+        }
+      }
+      if (clients.openWindow) {
+        return clients.openWindow(START_URL);
+      }
+      return undefined;
+    })
+  );
+});
+
 self.addEventListener('message', (event) => {
   const data = event.data;
   if (!data || data.type !== 'notify') {