added reward checking

scripts/offline.js

@@ -0,0 +1,35 @@
+/* offline.js
+Make app available offline */
+
+const CACHE_NAME = `RollDice`;
+
+// Use the install event to pre-cache all initial resources.
+self.addEventListener('install', event => {
+  event.waitUntil((async () => {
+	const cache = await caches.open(CACHE_NAME);
+	cache.addAll(['/']);
+  })());
+});
+
+self.addEventListener('fetch', event => {
+  event.respondWith((async () => {
+	const cache = await caches.open(CACHE_NAME);
+
+	try {
+	  // Try to fetch the resource from the network.
+	  const fetchResponse = await fetch(event.request);
+
+	  // Save the resource in the cache.
+	  cache.put(event.request, fetchResponse.clone());
+
+	  // And return it.
+	  return fetchResponse;
+	} catch (e) {
+	  // Fetching didn't work get the resource from the cache.
+	  const cachedResponse = await cache.match(event.request);
+
+	  // And return it.
+	  return cachedResponse;
+	}
+  })());
+});