export declare const nodeData: (node: any) => any;
export declare const nodesData: (nodes: any[]) => any;
export declare const hasChildren: (node: any) => boolean;
export declare const generateId: () => string;
export declare const firstArrayElement: (arr: any) => any;
export declare const filterObject: (obj: object, { disallowedKeys }: {
    disallowedKeys: string[];
}) => object;