import type { EchoConfig, EchoRequest, EchoResponse } from './types';
export declare function isEchoError(error: any): error is EchoError;
export declare class EchoError extends Error {
    message: string;
    config: EchoConfig;
    request: EchoRequest;
    response?: EchoResponse | undefined;
    constructor(message: string, config: EchoConfig, request: EchoRequest, response?: EchoResponse | undefined);
}