Do context theme support tree shaking ?

[krishnasaga]

For example is have code like this

//component.js
import { Button, Radio } from 'my-library';

const Component = props => <div><Button></Button><Radio></div>;

//Theme.js
const contextTheme = {
  Button: require('my-library/button/theme1.css'),
  Radio: require('my-library/radio/theme1.css'),
  Other: require('my-library/other/theme1.css'),
};

<ThemeProvider them={contextTheme} >
     <Component></Component>
</ThemeProvider>

I'm using extract-text-plugin for webpack.
Will my final build contains CSS of other ass well ?