I've tried fresh npm install, it doesn't work.
I'm not sure what to do.
Please help me to fix this error. Thank you...

The text was mostly copied from 99 scala problems and overall is too verbose.
Probably it should also explain existing Kotlin API for graphs.

there are a lot of missing or glossed-over steps and choices to make.

I've used IntelliJ and Scala before, but regardless, I found these instructions difficult to follow and I felt very uncertain whether I was doing it right.

I'm skeptical that a new user could follow these instructions without a lot of guesswork and/or outside assistance

The API is well-defined in the code, but it would be nice to have it in ReadTheDocs.
It would also allow us to add bits of useful information, such as the fact that #470 exists.