A type-safe wrapper for safely executing exception-throwing functions

unthrow.ts

function unthrow<Fn extends (...args: any) => unknown, Err = Error>(fn: Fn) {
  type In = Parameters<Fn>;
  type Out =
    | { ok: true; data: ReturnType<Fn> }
    | { ok: false; error: Err };

  return (...args: In): Out => {
    try {
      return { ok: true, data: fn(...args) as ReturnType<Fn>};
    } catch (e) {
      return { ok: false, error: e as Err };
    }
  };
}