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I think Typescript is close. It does suffer from JS heritage.

A TS like language that also had a way to runtime check types (for those data boundaries) but mix in some “any” when needed would be a hell of a pragmatic language.

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A robust approach for data-boundaries is to write parsers or decoders. The Elm community has done some nice work here.

Yes I am suggesting making that sort of stuff but even further make it a language feature (I know purists prefer fewer language features which is OK). I feel it is a bit early in its journey but mint is a good example:

https://mint-lang.com/

It is made by someone coming from the Elm community, who made a lot of Elm packages.

Common Lisp is idd pretty nice.

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