export interface Ok<T> {
    readonly ok: true;
    readonly value: T;
}
export interface Err<E> {
    readonly ok: false;
    readonly 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>(result: Result<T, E>): result is Ok<T>;
export declare function isErr<T, E>(result: Result<T, E>): result is Err<E>;
export declare function map<T, E, U>(result: Result<T, E>, mapper: (value: T) => U): Result<U, E>;
export declare function mapErr<T, E, F>(result: Result<T, E>, mapper: (error: E) => F): Result<T, F>;
export declare function andThen<T, E, U>(result: Result<T, E>, mapper: (value: T) => Result<U, E>): Result<U, E>;
export declare function unwrapOr<T, E>(result: Result<T, E>, fallback: T): T;
export declare function unwrapOrElse<T, E>(result: Result<T, E>, getFallback: (error: E) => T): T;
export declare function match<T, E, U>(result: Result<T, E>, handlers: {
    readonly ok: (value: T) => U;
    readonly err: (error: E) => U;
}): U;
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