ADT's in TypeScript aren't as nice as in a language that supports them natively in many respects, but "PITA" is really overselling it. We use them pervasively a

ADT's in TypeScript aren't as nice as in a language that supports them natively in many respects, but "PITA" is really overselling it. We use them pervasively at my shop. In fact, the ability to synthesize them without naming them (because TypeScript is structurally-typed instead of nominally) sometimes makes them even more convenient than in most FP languages (OCaml excepted) - the ability to, say, return an ad-hoc ADT from a lambda without giving it some meaningless name like "HelperFunctionResult" can occasionally be really handy.