import type TreeNode from '../../../../utils/dataStructures/tree';
import type { HeaderNodeData } from '../headersTree';
import type { NodeModificationResult } from './index';
/**
 * Collapsing a node is a process where the processing node is collapsed
 * to the colspan width of the first child.
 *
 * @param {TreeNode} nodeToProcess A tree node to process.
 * @returns {object} Returns an object with properties.
 */
export declare function collapseNode(nodeToProcess: TreeNode<HeaderNodeData>): NodeModificationResult;