MergeErr

@ts-rust/std

---

@ts-rust/std / Result / MergeErr

Type Alias: MergeErr<A, B>

type MergeErr<A, B> = [A] extends [never]
  ? B
  : [B] extends [never]
    ? A
    : IsUnknown<A> extends true
      ? B
      : IsUnknown<B> extends true
        ? A
        : A | B;

Defined in: packages/std/src/result/types.ts:66

Unions two error types, treating never and unknown as unbound slots.

Used when a generator both yields Errs and returns a Result, so an unannotated ok() does not swallow concrete errors from yield*.

Type Parameters

Type Parameter
A
B