title: 'React' is defined but never used
body: <p>I am following <a href="http://reactjs.org/" rel="noreferrer">the official reactjs</a> instructions to create a sample app. My node version is 6.9.0.</p>
  
  <p>I created sample react app which is supposed to display a empty tic tac toe table according to the official website using following instructions: </p>
  
  <p><code>npm install -g create-react-app</code></p>
  
  <p><code>create-react-app my-app</code></p>
  
  <p><code>cd my-app</code> </p>
  
  <p>changed to <strong>my-app</strong> directory</p>
  
  <p>removed the default files inside the source directory as directed. Now
  my <strong>index.js</strong> looks like this</p>
  
  <pre><code>import React from 'react';
  import ReactDOM from 'react-dom';
  import './index.css'; 
  </code></pre>
  
  <p>Then I ran <code>yarn start</code></p>
  
  <p>But all I see is blank screen no tic tac toe table. And couple warnings in the console saying</p>
  
  <pre><code>Compiled with warnings.
  
  ./src/index.js
    Line 1:  'React' is defined but never used     no-unused-vars
    Line 2:  'ReactDOM' is defined but never used  no-unused-vars
  
  Search for the keywords to learn more about each warning.
  To ignore, add // eslint-disable-next-line to the line before.
  </code></pre>