title: Solving linter error no-undef for document
body: <p>I am using <code>airbnb</code> extension for linting my React Project. Now, in my <code>index.js</code> I have:</p>
  
  <pre><code>import React from 'react';
  import ReactDOM from 'react-dom';
  import App from './App';
  
  ReactDOM.render(
    &lt;App /&gt;,
    document.getElementById('root'),
  );
  </code></pre>
  
  <p>linter says:</p>
  
  <pre><code>no-undef 'document' is not defined.at line 8 col 3
  </code></pre>
  
  <p>How can I solve this problem?</p>