For the typescript world, there is neverthrow[0] which offers a similar Result t...

pshirshov · 2025-10-31T10:06:02 1761905162

  Promise<Result<number, string>>

everywhere or

  type EitherT[F[_], E, A] = F[Either[E, A]]

and then

  def dosomething(): F[String, Number]

?

Isn't this beautiful: https://github.com/7mind/distage-example/blob/develop/bifunc... ?

RedNifre · 2025-10-31T11:28:05 1761910085

Why does it have Either? Doesn't TypeScript have "A | B" style sum types?

pshirshov · 2025-10-31T12:30:39 1761913839

Either is biased, union is not.

Probably we should say "union" instead of sum, as typescript unions are not discriminated. string | string in typescript is exactly the same as just string, while Either[String, String] is a type which is exactly a sum of two string types. Plus Either is biased towards R, the happy path value.