title: Does the use of es6 named imports reduce the bundle size when using webpack
body: <p>I need to understand when I use a named import like this</p>
  
  <pre><code>import { render } from 'react-dom'
  </code></pre>
  
  <p>does webpack include in the bundle only the render method or the whole module <strong>especially when using tree shaking</strong> by setting module to false in babel configuration and let webpack take care about them?</p>
  
  <p>Also in the case of importing react</p>
  
  <pre><code>import React from 'react'
  </code></pre>
  
  <p>&amp;&amp;</p>
  
  <pre><code>import React, { Component, PropTypes } from 'react'
  </code></pre>
  
  <p>what's the right way?</p>