/**
 * Keeps a floating panel measurable and focusable while its first position is
 * calculated. Each update gets a ticket, so an older calculation cannot move a
 * newer panel or reveal one whose positioning session has already closed.
 * @internal
 */
export declare function positionSession(floating: HTMLElement): {
    next: () => number;
    commit: (ticket: number, apply: () => void) => void;
    close: () => void;
};