title: react-loadable Chunks loaded but code not executed
body: <p>I got an issue,attempting to use chunks in my react APP by using </p>
  
  <blockquote>
    <p>react-loadable</p>
  </blockquote>
  
  <p>Its works perfect in webpack-dev-server in development mode,but when im build project and serve it to server,async components loaded,but code in them not being executed.
  So page just renders with loaders which should be rendered until component will be loaded.
  No errors in console or something,everything is clear , chunk script is inserted to html head on load,and nothing happens :(</p>
  
  <pre><code>Example async component
  import Loadable from 'react-loadable';
  const AsyncComponent = Loadable({
    loader : () =&gt; (import('../../components/AsyncComponent')),
    loading : () =&gt; (&lt;div&gt;Loading....&lt;/div&gt;),
  });
  </code></pre>
  
  <p>and render</p>
  
  <pre><code>&lt;Route path="/path/to/asynccomponent" render={() =&gt;(&lt;AsyncComponent /&gt;)} /&gt;
  </code></pre>
  
  <blockquote>
    <p>UPD : There was error passed to loading component TypeError: Cannot read property 'call' of undefined↵    at o (<a href="http://localhost:3000/assets/js/bundle-8866517f8f287a1d3c6b.js:1:318" rel="noreferrer">http://localhost:3000/assets/js/bundle-8866517f8f287a1d3c6b.js:1:318</a></p>
  </blockquote>
  
  <p>Fixed it by installing </p>
  
  <blockquote>
    <p>babel-plugin-syntax-dynamic-import</p>
  </blockquote>
  
  <p>And update exctractCssPlugin options to</p>
  
  <blockquote>
    <p>new exctactCss({filename : 'css/style.css' , allChunks: true})</p>
  </blockquote>