/**
 * How to use:
 * ```tsx
 * const MyComponent: React.FC = () => {
 *   const container = React.useRef<HTMLElement | null>(null);
 *
 *   React.useEffect(() => {
 *      const keydown = (event: KeyboardEvent) => {
 *        if (
 *          event.key.toLowerCase() !== 'tab' ||
 *          !TabManager.isCurrentContainer(containerRef.current)
 *        ) {
 *          return;
 *        }
 *
 *        event.preventDefault();
 *
 *        if (event.shiftKey) {
 *          TabManager.focusPrev();
 *        } else {
 *          TabManager.focusNext();
 *        }
 *      };
 *
 *     window.document.addEventListener('keydown', keydown);
 *
 *      return () => {
 *         window.document.addEventListener('keydown', keydown);
 *      }
 *   }, []);
 *
 *   return (
 *     <div ref={container} onKeyDown>
 *      ...
 *     </div>
 *   )
 * }
 * ```
 */
declare class TabManager {
    #private;
    isCurrentContainer(elem: HTMLElement | null): boolean | null;
    getTopOfTheStack(): {
        stackElement: {
            container: HTMLElement;
            lastIndex: number;
            lastFocused: HTMLElement | Element | null;
        };
        stackIndex: number;
    };
    registerContainer(container: HTMLElement): void;
    unregisterContainer(container: HTMLElement, revertBackFocus?: boolean): void;
    getElementsList(): HTMLElement[];
    focusNext(): void;
    focusPrev(): void;
}
declare const tabManager: TabManager;
export default tabManager;