import { Request, Response, Router, RouterOptions } from 'express';
import { Observable } from 'rxjs';
export declare class ExpressApiRouterError extends Error {
    constructor(message: string);
}
export declare class ApiError extends Error {
    statusCode: number;
    constructor(data: string, statusCode: number);
}
export declare const ApiNext: unique symbol;
declare type SimpleApiResult = string | boolean | number | object | {
    [key: string]: string;
} | typeof ApiNext | undefined;
export declare class ApiResponse {
    apiResult: SimpleApiResult;
    code: number;
    constructor(apiResult: SimpleApiResult, code?: number);
}
export declare type ApiResult = SimpleApiResult | ApiResponse;
export declare type AsyncApiResult = Observable<ApiResult> | Promise<ApiResult>;
export declare type ErrorFormatter = (this: ExpressApiRouter, err: Error, req: Request, res: Response) => AsyncApiResult | ApiResult;
export declare type SuccessFormatter = (this: ExpressApiRouter, data: ApiResult, req: Request, res: Response) => AsyncApiResult | ApiResult;
export interface ApiRouterOptions extends RouterOptions {
    errorFormatter?: ErrorFormatter;
    successFormatter?: SuccessFormatter;
    silenceExpressApiRouterError?: boolean;
    internalServerError?: string;
}
export interface ExpressApiRouter extends Router {
    errorFormatter: ErrorFormatter;
    successFormatter: SuccessFormatter;
    setErrorFormatter(formatter: ErrorFormatter): void;
    setSuccessFormatter(formatter: SuccessFormatter): void;
}
export declare function ExpressApiRouter(options?: ApiRouterOptions): ExpressApiRouter;
export {};