Issues Running test using ES8 syntax

[johnryan]

This issue is a: Bug Report

When using the syntax mentioned here https://github.com/insin/nwb/blob/master/docs/guides/ReactComponents.md#libraries

i.e. export Button from './Button'

The running the tests throws an error:

PhantomJS 2.1.1 (Mac OS X 0.0.0) ERROR
  Error: Module build failed: SyntaxError: Unexpected token, expected { (2:7)
  
    1 | 
  > 2 | export Button from './Button'
      |        ^
    3 | 
  
  at tests/index-test.js:26749

Information:

Node 6.11.0
npm 3.10.10
nwb 0.18.10

├── @storybook/react@3.2.3
├── node-pre-gyp@0.6.36 extraneous
├── nwb@0.18.10
├── react@15.6.1
├── react-dom@15.6.1
└── styled-components@2.1.2```