This is a very interesting project. I really like the combination of languages and the way you've implemented it. I already see some opportunities to use it.
I especially see this being useful in my CI environment which has a handful of functions, some json and yaml parsing (using jq and python respectively), etc. It's a little cumbersome at the minute but not so much to switch from bash and the rest of the project is JS anyway so it would be good to be consistent.
> useful in my CI environment
For sure. I've been meaning to play around with getting a docker image with the shell set as the default. It's definitely a use-case I had in mind.