export interface TreeMeta {
    tree$Id: string;
    tree$ParentId: string | null;
    tree$Tier: number;
    tree$Path: string;
    tree$HasChildren: boolean;
    tree$ChildrenLength: number;
}
export type TreeNode<T> = T & TreeMeta;
export declare class CoreTreeEngine<T extends Record<string, any>> {
    private nodeMap;
    private parentMap;
    private childrenMap;
    build(items: T[], keyField: keyof T, parentField: keyof T): TreeNode<T>[];
    getParent(id: string): string | null;
    getChildren(id: string): T[];
}