Document SplitChunksPlugin function parameters

[ryandrew14]

Feature to document

SplitChunksPlugin -- function parameters in functions for splitChunks.name and splitChunks.cacheGroups.{cacheGroup}.test

#6341 -- introduction of SplitChunksPlugin

Author(s)
@sokra

Additional information
These two functions take in parameters chunks and module, of which there does not seem to be documentation yet on what fields these parameters have. It was really tough for me to use this function even for something simple like a small name change because I didn't know what values I was provided to work with. The module and chunks arguments are pretty esoteric, and it would be wonderful if people like me and this guy had a little more to go off of when using these functions.

[EugeneHlushko]

Awww i didnt see your PR @ryandrew14

[ryandrew14]

@EugeneHlushko Your PR provides the example @montogeek was asking for, but mine provides more information that has proven to be helpful in the actual documentation area. Can we merge both of them?

BTW, thanks for the research, and for a really solid example.

[montogeek]

Merge both :)

[EugeneHlushko]

Yes i dont see why not, but i left a comment in your PR. Also i am adding test example today

[EugeneHlushko]

I've had a look at test function example and there isnt much i can add, you can check different properties of module, and chunks but thats about it. i am adding return types to the functions to make it even more obvious