react-boilerplate + react-map-gl incompatibility example

How to reproduce the problem

1. Investigate the commit history to see what was added on top of a clean boilerplate.
   Sources for these steps:
   https://github.com/mapbox/mapbox-gl-js/blob/master/webpack.config.example.js
   visgl/react-map-gl#21 (comment)

2. Clone

npm start

4. See this (the map is empty + errors in console):

npm build

4. Open the contents of /build/ on some virtual host and see this (the map is being rendered):