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app/sw.js

@@ -0,0 +1,12 @@
+const CACHE = 'safeaccess-v1';
+const ASSETS = ['/', '/index.html', '/manifest.json'];
+
+self.addEventListener('install', e => {
+  e.waitUntil(caches.open(CACHE).then(c => c.addAll(ASSETS)));
+});
+
+self.addEventListener('fetch', e => {
+  e.respondWith(
+    caches.match(e.request).then(r => r || fetch(e.request)).catch(() => caches.match('/index.html'))
+  );
+});