up to step 4

step1-04/demo/src/components/Counter.tsx

@@ -1,11 +1,9 @@
 import React from 'react';
 
-export class Counter extends React.Component<any, any> {
-  
+export class Counter extends React.Component {
   render() {
-   
     return (
-     
+    
     );
   }
 }

step1-04/demo/src/index.temp

@@ -0,0 +1,4 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { App } from './App';
+ReactDOM.render(<App />, document.getElementById('app'));