import type { VisibilityOptions } from './visible';
/**
 * Chain focus order between passed elements.
 * Passive (should be called inside keyboard event handler)
 */
export declare const handleFocusChain: (e: KeyboardEvent, first: HTMLElement | undefined, last: HTMLElement | undefined) => boolean | undefined;
/** @returns if the element is focusable */
export declare const isFocusable: (el: HTMLElement) => boolean;
/**
 * Gets keyboard-focusable elements within a specified root element
 * @param root - root element
 * @param visibilityOpt - visibility check options or false to skip visibility check
 */
export declare const getKeyboardFocusableElements: (root?: HTMLElement | Document, visibilityOpt?: VisibilityOptions | false) => Element[];