Izmjenjena struktura, dodan backand

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

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+/**
+ * Copyright (c) 2013-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 performance
+ * @typechecks
+ */
+
+'use strict';
+
+var ExecutionEnvironment = require('./ExecutionEnvironment');
+
+var performance;
+
+if (ExecutionEnvironment.canUseDOM) {
+  performance = window.performance || window.msPerformance || window.webkitPerformance;
+}
+
+module.exports = performance || {};