/**
 * _**WARNING:**_ This hook is intended as a temporary solution and
 * is likely to be removed in a future version of page-layout.
 *
 * ---
 *
 * This hook will prevent the left sidebar from automatically collapsing
 * when it is in a flyout state.
 *
 * The intended use case for this hook is to allow popup menus in the
 * left sidebar to be usable while it is in a flyout state.
 *
 * ## Usage
 * The intended usage is to use this hook within the popup component
 * you are rendering. This way the left sidebar will be locked for
 * as long as the popup is open.
 *
 * @deprecated `@atlaskit/page-layout` is deprecated. Use `@atlaskit/navigation-system` instead.
 */
export declare const useLeftSidebarFlyoutLock: () => void;