import { BaseError } from "./errors/base";

type OkResult<V> = {
  val: V;
  err?: never;
};

type ErrResult<E extends BaseError> = {
  val?: never;
  err: E;
};

export type Result<V, E extends BaseError = BaseError> = OkResult<V> | ErrResult<E>;

export function Ok(): OkResult<never>;
export function Ok<V>(val: V): OkResult<V>;
export function Ok<V>(val?: V): OkResult<V> {
  return { val } as OkResult<V>;
}
export function Err<E extends BaseError>(err: E): ErrResult<E> {
  return { err };
}