If I understand correctly you want "new types" in typescript, which can be done either via a library or by hand rolling it: - https://github.com/gcanti/newtype

If I understand correctly you want "new types" in typescript, which can be done either via a library or by hand rolling it: - https://github.com/gcanti/newtype-ts https://github.com/gcanti/newtype-ts - https://github.com/Microsoft/TypeScript/issues/4895#issuecomment-401067935 https://github.com/Microsoft/TypeScript/issues/4895#issuecom... but it isn't as nice as say Python's `typing.NewType` or Haskell's `newtype`