webpack+library+npm+local+babel

Scope:
How to create a local project which should be use in another local project- as a library
.
+ Make it a local linked package, install it in your other project, enable the library option in webpack, builed it manually or with the watch option.

1. Use npm link to symlink your local module A into module B. So all your changes in module A are reflected immediately in module B
See here: https://docs.npmjs.com/cli/link

2. Make sure that your source module (A) is wrapped correctly by webpack so you can require it like any other library.
Use this: https://github.com/webpack/webpack/tree/master/examples/multi-part-library

3. Now you can require it normally and now focus on Project B! :)