/** @packageDocumentation
 * @module Popup
 */
import * as React from "react";
/** Focus into first focusable element of a container.
 * @internal
 */
export declare function focusIntoContainer(focusContainer: HTMLDivElement, initialFocusElement?: React.RefObject<HTMLElement | null> | string): boolean;
/** Properties supported by [[FocusTrap]] component.
 * @internal
 */
export interface FocusTrapProps extends React.AllHTMLAttributes<any> {
    /** child components */
    children: React.ReactNode;
    /** if active is not true then no trapping of focus is attempted. */
    active?: boolean;
    /** restore focus to element that had focus before trap was activated */
    returnFocusOnDeactivate: boolean;
    /** Optional reference to element to receive focus when trap is activated. Optionally a CSS Selector
     * string can be supplied to locate an element in the FocusTrap container. If no specification is defined
     * the first focusable element is used.
     */
    initialFocusElement?: React.RefObject<HTMLElement | null> | string;
}
/** Trap Focus in container while trap is active.
 * @internal
 */
export declare function FocusTrap(props: FocusTrapProps): React.JSX.Element | null;
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