Problem with unused library functions

[hcvazquez]

My name is Hernan; with a group of colleagues we are conducting a research about unused code present in dependencies of JavaScript projects. We call this functions, UFF (Unused foreign functions). We found that in most projects there exist a great amount of UFF that are being included in the final bundle.

In the case of chomsky (v 1.0.8) our tools detected approximately 1000 unused function in the dependencies (systemjs, when, rxjs, symbol-observable, numbro, moment-timezone, moment). Removing those functions, the size of chomsky bundled could be reduced at least 38% (All tests passed). I’m attaching the reduced version of your project.
bundle(optimized).txt

I’ll be very grateful if you can answer me the following questions:
-Did you were aware of the existence of these unused functions in your projects?
-Do you think that this is a problem?

Thanks in advance.

Cheers,