import { Option } from './option';
/**
 * Return a `None` if `left` does not contain a value,
 * otherwise return `right`
 * @param left Option to match against
 * @param right Option to return when `left` contains a value
 * @returns Either `right` or a `None`
 */
export declare const and: <Left = never, Right = Left>(left: Option<Left>, right: Option<Right>) => Option<Right>;
/**
 * Return `None` if `left` does not contain a value,
 * otherwise call `right` with the wrapped value and return the result
 * @param left Option to match against
 * @param right Function to call when `left` contains a value
 * @returns Either returning value of `right` or a `None`
 */
export declare const andThen: <Left = never, Right = Left>(left: Option<Left>, right: (value: Left) => Option<Right>) => Option<Right>;