import React from "react";
declare type OptionProps = React.DetailedHTMLProps<React.OptionHTMLAttributes<HTMLOptionElement>, HTMLOptionElement>;
declare type OptgroupProps = React.DetailedHTMLProps<React.OptgroupHTMLAttributes<HTMLOptGroupElement>, HTMLOptGroupElement>;
export declare function isHTMLOptionElement(element: React.ReactNode): element is React.ReactElement<OptionProps, "option">;
export declare function isHTMLOptgroupElement(element: React.ReactNode): element is React.ReactElement<OptgroupProps, "optgroup">;
/**
 * Convert a `children` prop rendered with `<optgroup><option /></optgroup>` and
 * `<option />` elements into an array of the props of each of those `option`
 * elements.
 */
export declare function reactNodeToDownshiftItems(children: React.ReactNode): OptionProps[];
export {};