[Etheryte]

Personally I really enjoy Typanion [0] since it's very similar to Yup [1] which I previously had extensive experience with. You can find more alternatives and a lengthy discussion about the whole problem space and its history in [2].

[0] https://github.com/arcanis/typanion

[1] https://github.com/jquense/yup

[2] https://github.com/microsoft/TypeScript/issues/3628