/**
 * Checks whether the given node (target) belongs to the container.
 * The function is similar to nodeContains but also accounts for dropdowns with expandToViewport=true.
 *
 * @param container Container node
 * @param target Node that is checked to be a descendant of the container
 */
export declare function nodeBelongs(container: Node | null, target: Node | EventTarget | null): boolean;