working towards a PWA

client/sw.js

@@ -0,0 +1,32 @@
+var CACHE_NAME = 'flaketest';
+var urlsToCache = [
+  '/',
+  '/index.html',
+  '/index.js'
+];
+
+self.addEventListener('install', function(event) {
+  // Perform install steps
+  event.waitUntil(
+  caches.open(CACHE_NAME)
+    .then(function(cache) {
+      console.log('Opened cache');
+      return cache.addAll(urlsToCache);
+    })
+  );
+});
+
+self.addEventListener('fetch', function(event) {
+  event.respondWith(
+    caches.match(event.request)
+      .then(function(response) {
+        // Cache hit - return response
+        if (response) {
+          return response;
+        }
+        return fetch(event.request);
+      }
+    )
+  );
+});
+