import { type Result } from '../../plain_result/core/result.js';
import { type Option } from './option.js';
/**
 *  Convert to `Some(T)` if _input_ is `Ok(T)`.
 *  Otherwise, return `None`.
 */
export declare function fromOkToOption<T, E>(input: Result<T, E>): Option<T>;
/**
 *  Convert to `Some(E)` if _input_ is `Err(E)`.
 *  Otherwise, return `None`.
 */
export declare function fromErrToOption<T, E>(input: Result<T, E>): Option<E>;