import { ApiResponse, BaseTdObject, Deferred, ErrorUnion, Middleware, MiddlewareOn } from './types';
export declare function pick<T, K extends keyof T>(obj: T, paths: K[]): Pick<T, K>;
export declare function createDeferred(): Deferred;
export declare function isError(obj: any): obj is ErrorUnion;
export declare function toObject<T extends BaseTdObject>({ response }: ApiResponse<any, T>): T;
export declare const on: MiddlewareOn<Middleware>;