1 files changed, 28 insertions, 0 deletions
diff --git a/node_modules/fbjs/lib/performanceNow.js.flow b/node_modules/fbjs/lib/performanceNow.js.flow
new file mode 100644
index 000000000..afa15974c
--- /dev/null
+++ b/node_modules/fbjs/lib/performanceNow.js.flow
@@ -0,0 +1,28 @@
+/**
+ * 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.
+ *
+ * @providesModule performanceNow
+ * @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 = () => performance.now();
+} else {
+  performanceNow = () => Date.now();
+}
+
+module.exports = performanceNow;
+\ No newline at end of file