import React from 'react';
declare type FocusList = HTMLElement[];
export declare function getFocusable(root?: Element | Document): FocusList;
export declare type FocusHint = HTMLElement | string | number | null;
export interface SearchState {
    focusHint: string | number;
    focusIndex: number;
    shift: boolean;
}
export interface FocusOpts {
    shift?: boolean;
    /** Allow overriding on a per-call basis. */
    control?: FocusControl;
}
/**
 * This is used when focus needs to enter the root, in one of two ways:
 *   1. It can return a list of elements, and the `focus()` method will be
 *      called on the one at `focusIndex` (accounting for negative indexes).
 *   2. It can return a single element.
 *   3. It can also return `undefined` to do nothing.
 *
 * The default returns a list of all focusable elements in the popup.
 */
export declare type FocusControl = (root: HTMLElement, state: SearchState) => FocusList | HTMLElement | undefined;
export declare type FocusSetter = (f: FocusHint, opts?: FocusOpts) => void;
export declare function useFocusControl(fc: FocusControl | undefined, rootId: string): FocusSetter;
export declare function useFocusControl(fc?: FocusControl): [FocusSetter, React.RefObject<HTMLElement>];
export declare function getCurrentFocusIndex(focusList: FocusList, fallback: number): number;
export declare function getFocusIndex(focusList: FocusList, { focusHint, focusIndex, shift }: SearchState): number | undefined;
export declare function wrapIndex(focusIndex: number, focusCount: number): number;
export declare function findIndexByTextContent(focusList: FocusList, focusHint: string, currentIndex: number): number | undefined;
export {};