Initial commit 🎉

fbshipit-source-id: b6fc29740c6875d2e78953b8a7123890a67930f2
Co-authored-by: Sebastian McKenzie <sebmck@fb.com>
Co-authored-by: John Knox <jknox@fb.com>
Co-authored-by: Emil Sjölander <emilsj@fb.com>
Co-authored-by: Pritesh Nandgaonkar <prit91@fb.com>

static/serviceWorker.js

@@ -0,0 +1,35 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+const CACHE_NAME = 'v1';
+
+self.addEventListener('message', e => {
+  if (e.data.precachedIcons) {
+    caches.open(CACHE_NAME).then(cache => cache.addAll(e.data.precachedIcons));
+  }
+});
+
+self.addEventListener('fetch', function(event) {
+  if (event.request.url.startsWith('https://external.xx.fbcdn.net/assets/')) {
+    event.respondWith(
+      // Cache falling back to the network
+      caches.match(event.request).then(cacheResponse => {
+        return (
+          cacheResponse ||
+          fetch(event.request).then(response => {
+            const clone = response.clone();
+            // write to cache
+            caches
+              .open(CACHE_NAME)
+              .then(cache => cache.put(event.request, clone));
+            return response;
+          })
+        );
+      }),
+    );
+  }
+});