Create React App default code cleanup

bash.sh

function craclean(){
rm -rf $1/src/App.js $1/src/App.css $1/src/App.test.js $1/src/index.css $1/src/logo.svg
cat << EOS > $1/src/App.js
import React, { Component } from 'react'
export default class App extends Component {
  render() {
    return (
      <div>
        App
      </div>
    )
  }
}
EOS
cat << EOS > $1/src/index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import * as serviceWorker from './serviceWorker';

ReactDOM.render(<App />, document.getElementById('root'));

// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: http://bit.ly/CRA-PWA
serviceWorker.unregister();
EOS
}