KubeJS's "documentation" in Aurora doesn't actually provide documentation.
It just gives you a source/function map, and no actual documentation.
Absolutely jack-s*** about how to use anything.
All it tells you is the names of functions and arguments.
But nothing about what any of it does, nor what they're for.

Edit:
wouldn't be so bad if it had examples, but it doesn't.
Thank goodness for this documentation, would have no clue about how to use KubeJS without it.

The documentation is being written now in the page you linked