/// <reference types="morgan" />
import { Polka, Middleware } from '../types';
import { MorganFormat, Options as MorganOptions } from './builtin/morgan';
export declare class MiddlewareLoader {
    private app;
    constructor(app: Polka);
    useBodyParser(): this;
    useMorgan(format?: MorganFormat, options?: MorganOptions): this;
    use(base: string | Middleware, ...mw: Middleware[]): this;
}