import type { Option } from './option.js';
type Map = {
    <Fn extends (value: any) => any, Opt extends Option<Parameters<Fn>[0]>>(mapFn: Fn): (option: Opt) => Option<ReturnType<Fn>>;
    <Fn extends (value: any) => any, Opt extends Option<Parameters<Fn>[0]>>(mapFn: Fn, option: Opt): Option<ReturnType<Fn>>;
};
/**
 * Transforms `Option<T>` to `Option<U>` by applying the provided function to the contained value of `Some` and leaving
 * `None` values unchanged.
 *
 * @tags option, transform, transform-value, right-biased
 */
export declare const map: Map;
export {};