import { RefObject } from 'react';
/** Tabbable descendants of `root`, in DOM order. */
export declare function tabbablesIn(root: ParentNode | null): HTMLElement[];
export interface UseFocusBoundaryArgs {
    /** The trigger element focus returns to on Escape / Shift+Tab out of the content's top. */
    triggerRef: RefObject<HTMLElement | null>;
    /** The portaled content root — tabbables inside it define the Tab boundary. */
    contentRef: RefObject<HTMLElement | null>;
}
/**
 * Focus helpers for content portaled to the end of the DOM (e.g. via BodyEnd), where Tab can't
 * reach it in visual document order on its own. Used by Popover and by Menu, which both need to
 * hand focus back to the trigger on Escape / Shift+Tab out of the top, and continue focus
 * naturally past the trigger when Tab exits the bottom.
 */
export declare function useFocusBoundary({ triggerRef, contentRef }: UseFocusBoundaryArgs): {
    firstTriggerFocusable: () => HTMLElement | null;
    restoreFocusToTrigger: () => void;
    focusAfterTrigger: () => void;
};