I'm trying to run the hot dev server on our site with webpack; the site uses ReactJS, which has this code in it:

if (production !== process.env.NODE_ENV) // etc

When not running hot-swap it's fine, but with the hot-swap, it gets run, resulting in the error:

TypeError: process.env is undefined

The code looks like this:

The project is modelled after https://github.com/webpack/react-starter which does work; so the question is; what error have I made in the config file and/or how do I go about looking for the error when the 'production' compilation works just fine?

I've posted the gist of the webpack config file.