import { ReactNode, RefObject } from 'react';
export declare const DATA_ATTRIBUTE_INDEX = "keyboard_index";
export interface FocusableElement {
    /** Ref pointing to the focusable DOM element. */
    ref: RefObject<HTMLElement>;
    /** Handler invoked when the element is clicked. */
    onClick: (() => void) | undefined;
}
export interface HotkeyIem {
    /** Keyboard shortcut associated with the item. */
    hotkey: string;
    /** Index of the item in the flattened tree. */
    index: number;
}
export declare const useFlattenedTree: (children: ReactNode, selectedIndex: number, onSelectedIndexChange: (index: number) => void) => {
    flattenedTree: ReactNode[];
    hotkeys: HotkeyIem[];
    itemsRef: RefObject<HTMLElement[]>;
};