import type { Option } from './option.js';
type AndThen = {
    <Opt extends Option.Any, Fn extends (value: any) => Option.Any>(mapFn: Fn): (option: Opt) => ReturnType<Fn>;
    <Opt extends Option.Any, Fn extends (value: any) => Option.Any>(mapFn: Fn, option: Opt): ReturnType<Fn>;
};
/**
 * Applies a mapping function to the value of an `Option`, returning a new `Option`. If the input `Option` is `None`,
 * the function immediately returns `None` without calling the mapping function.
 *
 * @tags option, transform, transform-option, right-biased
 */
export declare const andThen: AndThen;
export {};