export declare class ParentTreeNodeService {
    getNextNodeId(treeNodesData: any[], hierarchyInfoKey: string, currentId: string): string;
    getNextSiblingNodeId(siblingtreeNodesData: any[], currentId: string): string;
    getChildNodesData(treeNodesData: any[], hierarchyInfoKey: string, fLayer: number, fParentElement: string): any[];
    getFirstNodeId(treeNodesData: any[], hierarchyInfoKey: string): string;
    private getRootLayer;
}