Initial commit

Libraries/Utilities/RCTRenderingPerf.js

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+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule RCTRenderingPerf
+ */
+'use strict';
+
+var ReactDefaultPerf = require('ReactDefaultPerf');
+var ReactPerf = require('ReactPerf');
+
+var invariant = require('invariant');
+var perfModules = [];
+
+var RCTRenderingPerf = {
+  toggle: function() {
+    if (ReactPerf.enableMeasure) {
+      ReactDefaultPerf.stop();
+      ReactDefaultPerf.printInclusive();
+      ReactDefaultPerf.printWasted();
+      perfModules.forEach((module) => module.stop());
+    } else {
+      ReactDefaultPerf.start();
+      console.log('Render perfomance measurements started');
+      perfModules.forEach((module) => module.start());
+    }
+  },
+
+  register: function(module) {
+    invariant(
+      typeof module.start === 'function',
+      'Perf module should have start() function'
+    );
+    invariant(
+      typeof module.stop === 'function',
+      'Perf module should have stop() function'
+    );
+    perfModules.push(module);
+  }
+};
+
+module.exports = RCTRenderingPerf;