You are right, this is not safe, I just wanted to point out that the `path` module does more than just string concatenation.

If we move this to the `ServerRouter` there is one path concatenation left for the `controllerDir`.

`browser-builtins` is used by `browserify` to bundle node core modules. We could use this even with requirejs.

Our browserify setup is not different as the setup from the examples.