/// <reference types="node" />
import * as http from "http";
import { Stream } from "stream";
import Promise, { Thenable } from "yaku";
export interface Context {
    /**
     * It will be auto set as the response body.
     */
    body: String | Buffer | Stream | Thenable<any> | Object;
    /**
     * An IncomingMessage object is created by http.Server or http.
     * ClientRequest and passed as the first argument to the 'request' and 'response' event respectively.
     * It may be used to access response status, headers and data.
     * https://nodejs.org/api/http.html#http_http_incomingmessage
     */
    req: http.IncomingMessage;
    /**
     * This object is created internally by a HTTP server--not by the user. It is passed as the second parameter to the 'request' event.
     * The response implements the Writable Stream interface.
     * https://nodejs.org/api/http.html#http_class_http_serverresponse
     */
    res: http.ServerResponse;
    /**
     * It returns a promise which settles after all the next middlewares are setttled.
     */
    next: () => Promise<any>;
}
export interface MiddlewareFn {
    ($: Context): Thenable<any> | any;
}
export declare type Middleware = MiddlewareFn | Object;
export interface FlowHandler extends MiddlewareFn {
    (req: http.IncomingMessage, res: http.ServerResponse): Promise<any>;
}
export default function (middlewares: Middleware[]): FlowHandler;