node_modules

1 files changed, 33 insertions, 0 deletions

diff --git a/node_modules/fbjs/lib/performanceNow.js b/node_modules/fbjs/lib/performanceNow.js
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index 000000000..925df0680
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+++ b/node_modules/fbjs/lib/performanceNow.js
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+'use strict';
+
+/**
+ * Copyright (c) 2013-present, 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.
+ *
+ * @typechecks
+ */
+
+var performance = require('./performance');
+
+var performanceNow;
+
+/**
+ * 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.now) {
+  performanceNow = function performanceNow() {
+    return performance.now();
+  };
+} else {
+  performanceNow = function performanceNow() {
+    return Date.now();
+  };
+}
+
+module.exports = performanceNow;
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