export type Ok<T> = {
    tag: 'ok';
    value: T;
};
export interface Err<E> {
    tag: 'error';
    error: E;
}
export type Result<T, E> = Ok<T> | Err<E>;
export declare function ok<T>(value: T): Ok<T>;
export declare function err<E>(error: E): Err<E>;
export declare function isOk<T, E = unknown>(result: Result<T, E>): result is Ok<T>;
export declare function isErr<E, T = unknown>(result: Result<T, E>): result is Err<E>;