Hi Sebastian,
I didn't test the lib!
I'm not sure, how you intend to use / call the chartist functions. .. But if you want to access the API within a TW file, you'll need to follow a specific pattern.
So TW will be able to use the lib with node _and_ within a file TW.
You only need to include chartist.min.js and chartist.css (I'd go with the human readable CSS)since it seems there are no other dependencies, which is nice!
It contains a "files" subdirectory, which list the 3rd party files. .. your config should be very similar. Have a close look at tiddlywiki.files
You also need the
plugins.info, that is needed, so TW can extract and load the library.
If you look at startup.js in the jszip lib, you'll see, how the 3rd party lib can be accessed as a TW plugin. It's as simple as calling require().
If you can be more specific, what you want to achieve, it would be easier to help.
Hope that helps for the beginning.
-mario