feat(Test): add performance analysis.

Author: Saber2pr

src/__test__/Test.tsx

@@ -2,7 +2,7 @@
  * @Author: saber2pr
  * @Date: 2019-12-06 17:41:19
  * @Last Modified by: saber2pr
- * @Last Modified time: 2019-12-10 20:37:43
+ * @Last Modified time: 2019-12-11 20:41:15
  */
 import React from ".."
 import ReactDOM from "../client"
@@ -85,5 +85,8 @@ const App = () => {
   )
 }
 
+// if need analysis the performance.
+// React.Stack.watchStackSize(console.log)
+
 // open '../../index.html' in browser.
 ReactDOM.render(<App />, document.getElementById("root"))