Typescript doesn't have functionality for non-equivalent types with identical primitives or interfaces (e.g. you can't have string-equivalent type A ≠ string-eq

Typescript doesn't have functionality for non-equivalent types with identical primitives or interfaces (e.g. you can't have string-equivalent type A ≠ string-equivalent type B), though there's ongoing discussion around adding it (https://github.com/Microsoft/TypeScript/issues/202 https://github.com/Microsoft/TypeScript/issues/202).