I'm going to say Clojure is probably what you want. Via clojurescript, it has very good interoperability with the tools you're already using and it's possible

I'm going to say Clojure is probably what you want. Via clojurescript, it has very good interoperability with the tools you're already using and it's possible that you might even choose to use it on the front end in the browser. That, coupled with the size of the community suggest to me that it is the winner here. For the (browser) front-end, there are lots of neat idiomatic-clojure libraries like https://reagent-project.github.io/ https://reagent-project.github.io/ For command-line scripting, your program will ultimately mostly access the filesystem or other OS functionality via interop with the host platform (either Java or Node).