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There's also Fable for F# but I believe this commenter is being sarcastic. Javascript is a common backend language.

I’m that ridiculous person who would rather learn OCaml from scratch if it meant I never had to use JS

Kidding of course. Mostly.

I'd rather learn MUMPS or COBOL than use JS... not kidding.

Before JS became a common backend language, you could do this with at least one stack: Clojure & ClojureScript.