import type { Nullable } from '../../nullable/core/nullable.js';
import type { Result } from '../core/result.js';
/**
 *  Unwrap `T` if _input_ is `Ok(T)`.
 *  Otherwise, return `null`.
 */
export declare function toNullableFromOk<T>(input: Result<T, unknown>): Nullable<T>;
/**
 *  Unwrap `E` if _input_ is `Err(E)`.
 *  Otherwise, return `null`.
 */
export declare function toNullableFromErr<E>(input: Result<unknown, E>): Nullable<E>;