I've never tried but can't you already just run your node or ruby or whatever scripts on both Windows, Mac, Linux? Is there some reason targeting bash and batch is important?
Why not Python/Ruby/Node.js/Lua
Yes you can use any of them as platform-independent glue code. But there are several disadvantages:
None of them is preinstalled on all platforms (including Windows).
Functionalities like process piping are not convenient to use.
Hard to integrate with existing code written in Bash or Batch.