Universal components package not going through the babel loader

Hey, I've tried using the universal components package in the web example and it seems it's not going through the babel loader
```
../universal-components/components/button/index.js
Module parse failed: Unexpected token (13:7)
You may need an appropriate loader to handle this file type.
| import PropTypes from 'prop-types';
|
| export type ButtonProps = {
| backgroundColor: string,
| fontColor: string,
```

Any ideas why?

Start by inspecting the web example's Babel loader configuration and how it handles ../universal-components/components/button/index.js. Reproduce the build error, then verify that the universal components package is transpiled successfully and the web example builds without the parse failure.

Written by the indexing model from the issue text.