Ah I see. That can be achieved since Flow 0.51 with opaque types[1][2]. It seems like TypeScript hasn't yet caught up with this functionality[3]. [1] https:/

Ah I see. That can be achieved since Flow 0.51 with opaque types[1][2]. It seems like TypeScript hasn't yet caught up with this functionality[3]. [1] https://medium.com/flow-type/hiding-implementation-details-with-flows-new-opaque-type-aliases-feature-40e188c2a3f9 https://medium.com/flow-type/hiding-implementation-details-w... [2] https://flow.org/en/docs/types/opaque-types/ https://flow.org/en/docs/types/opaque-types/ [3] https://github.com/Microsoft/TypeScript/issues/15807#issuecomment-301196459 https://github.com/Microsoft/TypeScript/issues/15807#issueco...