export declare const nodeData: (node: any) => any;
export declare const nodesData: (nodes: Array<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: Array<string>;
}) => {
    [key: string]: any;
};