import type { Result } from "../types.ts";
export declare class ErrImpl<E> {
    readonly ok: false;
    readonly err: true;
    readonly val: E;
    private readonly _stack;
    constructor(val: E);
    unwrap(): never;
    unwrapOr<T2>(val: T2): T2;
    unwrapOrElse<T2>(mapper: (val: E) => T2): T2;
    map(_mapper: unknown): ErrImpl<E>;
    mapOr<U>(default_: U, _mapper: unknown): U;
    mapOrElse<U>(default_: (error: E) => U, _mapper: unknown): U;
    mapErr<E2>(mapper: (err: E) => E2): ErrImpl<E2>;
    andThen(_op: unknown): ErrImpl<E>;
    orElse<T2, E2>(mapper: (err: E) => Result<T2, E2>): Result<T2, E2>;
    isOk(): false;
    isErr(): true;
    match<A, B>(_okMapper: (val: unknown) => A, errMapper: (err: E) => B): A | B;
    andTee(_mapper: unknown): ErrImpl<E>;
    orTee(mapper: (err: E) => unknown): ErrImpl<E>;
    andThrough(_mapper: unknown): ErrImpl<E>;
    get stack(): string;
}
export declare function Err<E>(value: E): ErrImpl<E>;
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