Hi,
I saw that you accept a configuration file for eustia. In order to prevent future user feature requests (support other formats, ability to extends configuration, etc.) let me suggest to use the library confinode which would do this for you.
Please ask me if any question or need help to integrate it.

It would be great if you could extract the core functionality and release it as a separate module that can be used programatically (by this and other projects). In particular, I'm very interested in using this in conjunction with webpack, where even tho you can pick and choose modules to include, you may use only a small fraction of a module's functionality. I would love to be able to create a webpack plugin using eustia functionality to optimize my bundles to remove all the module functionality my application doesn't use.