How to create a server bundle with Webpack for universal rendering

The recipe for setting up a universal rendering in the official Redux docs are good but it lacks one thing: It doesn't describe how to use Webpack for creating a bundle of the server side code. There are boilerplate projects that does it, but they usually do a million other things as well so it's complex to understand how it works.

Follow this step by step tutorial and learn how to use Webpack 2 to create a bundle of your server code.