Custom builds

[AshCoolman]

It would be nice to be able to easily create custom builds that only include the functions chosen. Lodash has something similar (see here).

A simple way might be to atomise the main file into es6 modules and included some commandline params for the build script.

[jdittrich]

A simple way might be to atomise the main file into es6 modules

Would that be hard to do?
I could try to split all the functions in files, but I am not well versed in build tools to mend them together again :)