text: import React          from 'react';
  import { Component }  from 'react';
  
  import BookList       from '../containers/book-list'
  import BookDetail     from '../containers/book-detail'
  
  export default class App extends Component {
    render() {
      return (
        <div>
          <BookList />
          <BookDetail />
        </div>
      );
    }
  }
  