WIP - add extractor, generate snippet_data

node_modules/fbjs/lib/performanceNow.js.flow

@@ -0,0 +1,25 @@
+/**
+ * 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 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;