import type { Option } from '../option/option.js';
import type { Result } from './result.js';
/**
 * Transforms `Result<T, E>` into `Option<T>`, mapping `Ok(v)` to `Some(v)` and `Err(e)` to `None`.
 *
 * @tags result, option, transform, transform-result
 */
export declare function ok<Res extends Result.Any>(res: Res): Option<Result.OkType<Res>>;