The point of JSON Schema is to have a common format independant of the programming language to ease interoperability.
Re:JSON Schema bundling formalised
by move-on-by on Friday September 10, 2021 @09:43AM
(#28481437)
I've never seen runtypes, but I've seen io-ts [1]. Are you aware of the pros/cons between them?
It let's you specify type definitions a DSL in Typescript using syntax very similar to Typescript's type definitions. Once you define your types in the DSL, you get Typescript types and parsing / verification for free. Not as general purpose as JSON Schema, but 1000x cleaner and easier to use.