import { Option } from './option.js';
export declare class Result<T, E> {
    private type;
    private value?;
    private error?;
    private constructor();
    private constructor();
    static Ok<T, E>(value: T): Result<T, E>;
    static Err<T, E>(error: E): Result<T, E>;
    isOk(): boolean;
    isErr(): boolean;
    map<U>(mapper: (val: T) => U): Result<U, E>;
    mapErr<U>(mapper: (err: E) => U): Result<T, U>;
    mapOr<U>(defaultValue: U, mapper: (val: T) => U): U;
    mapOrElse<U>(createDefaultValue: (err: E) => U, mapper: (val: T) => U): U;
    unwrap(): T;
    unwrapOr<U>(defaultValue: U): T | U;
    unwrapOrElse<U>(createDefaultValue: (err: E) => U): T | U;
    unwrapErr(): E;
    expect(message: string): T;
    expectErr(message: string): E;
    ok(): Option<T>;
    err(): Option<E>;
}