react app

react-app/node_modules/react/lib/performanceNow.js

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+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule performanceNow
+ * @typechecks
+ */
+
+var performance = require("./performance");
+
+/**
+ * Detect if we can use `window.performance.now()` and gracefully fallback to
+ * `Date.now()` if it doesn't exist. We need to support Firefox < 15 for now
+ * because of Facebook's testing infrastructure.
+ */
+if (!performance || !performance.now) {
+  performance = Date;
+}
+
+var performanceNow = performance.now.bind(performance);
+
+module.exports = performanceNow;