/**
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
 */
export declare function getParent<T>(nodes: T[], node: T, getLevel: (dataNode: T) => number): T | null;
export declare function getNextSibling<T>(nodes: T[], node: T, getLevel: (dataNode: T) => number, _index?: number): T | null;
export declare function getPrevSibling<T>(nodes: T[], node: T, getLevel: (dataNode: T) => number, _index?: number): T | null;