Agree. It would be awesome if TypeScript had some optional run-type information, maybe in the form of a decorator function @rtti function moo(foo: stri

Agree. It would be awesome if TypeScript had some optional run-type information, maybe in the form of a decorator function @rtti function moo(foo: string): number { … } => function moo(foo: string): number { … } moo.__type = { parameters: [{name: "foo", type: "string"}] returnType: "number" } or something like that.