Are they though? As a TypeScript user with very little Flow experience it seems like they are about the same: https://flow.org/en/docs/lang/nominal-structural/

Are they though? As a TypeScript user with very little Flow experience it seems like they are about the same: https://flow.org/en/docs/lang/nominal-structural/ https://flow.org/en/docs/lang/nominal-structural/ "For example, Flow uses structural typing for objects and functions, but nominal typing for classes." This statement also applies to TS. Flow does have nominally typed Opaque Type Aliases[1], which are essentially newtypes from what I've gathered. However, you can build similar zero-cost newtypes in TypeScript using union types, casting and "unique symbol"[2]. [1] https://flow.org/en/docs/types/opaque-types/ https://flow.org/en/docs/types/opaque-types/ [2] https://github.com/Microsoft/TypeScript/issues/4895#issuecomment-398821503 https://github.com/Microsoft/TypeScript/issues/4895#issuecom...