import { IObject } from '../types';
export declare const lean: (data: any) => any;
export declare const isValidObject: (obj: IObject) => boolean;
interface ISelect {
    [key: string]: string | number;
}
export declare const projectize: (select: ISelect) => {
    $project: ISelect;
} | null;
export declare const isValidId: (id: string) => boolean;
export {};