/**
 * Check if an expand node is currently collapsed.
 *
 * Uses two methods to determine collapse state:
 * 1. First checks aria-expanded attribute on the toggle button (most reliable).
 * 2. Falls back to checking content div visibility via computed styles.
 *
 * @param expandContainer - The expand container element.
 * @returns True if the expand is collapsed, false if expanded or state cannot be determined.
 */
export declare const isExpandCollapsed: (expandContainer: HTMLElement) => boolean;