Izmjenjena struktura, dodan backand

web/node_modules/fbjs/lib/requestAnimationFrame.js.flow

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+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule requestAnimationFrame
+ */
+
+var emptyFunction = require('./emptyFunction');
+var nativeRequestAnimationFrame = require('./nativeRequestAnimationFrame');
+
+var lastTime = 0;
+
+var requestAnimationFrame = nativeRequestAnimationFrame || function (callback) {
+  var currTime = Date.now();
+  var timeDelay = Math.max(0, 16 - (currTime - lastTime));
+  lastTime = currTime + timeDelay;
+  return global.setTimeout(function () {
+    callback(Date.now());
+  }, timeDelay);
+};
+
+// Works around a rare bug in Safari 6 where the first request is never invoked.
+requestAnimationFrame(emptyFunction);
+
+module.exports = requestAnimationFrame;