Add favorites feature - toggle, list, and pre-fill on add

client/public/service-worker.js

@@ -0,0 +1,14 @@
+const CACHE_NAME = 'meal-tracker-v1';
+const urlsToCache = ['/', '/index.html', '/assets/'];
+
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then(cache => cache.addAll(urlsToCache))
+  );
+});
+
+self.addEventListener('fetch', event => {
+  event.respondWith(
+    caches.match(event.request).then(response => response || fetch(event.request))
+  );
+});