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I replied with this elsewhere in the thread, but maybe Dhall? https://dhall-lang.org/

Functional? Check. Type annotations? Check. Not Turing complete? Check. Compiles to multiple config formats? Check.

Yeah, I think Dhall is the right idea, but I think it’s going to have the same syntax/ergonomics issues that Haskell and OCaml suffer from. Our company invested heavily in Nix, but the developers really struggled with the expression language which seems quite similar to Dhall both syntactically and ergonomically. While Dhall might be great for Haskell/OCaml/F# shops, a configuration language isn’t the right place to push for new idioms or ways to think about programming.

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