import EventEmitter from 'events';
import express from 'express';
import * as http from 'http';
import internal from 'stream';
import { WebSocket } from 'ws';
export type ConnectionUpgradeEvent = {
    request: http.IncomingMessage;
    socket: internal.Duplex;
    head: Buffer;
    webSocket: WebSocket;
};
/**
 * Generic server object. Handle typed event communication.
 *
 * @emits connection-upgraded
 */
export declare class HttpServer extends EventEmitter {
    static readonly UPLOADED_FILE_REGEXP: RegExp;
    static readonly MAX_UPGRADES_PER_SECOND = 3;
    static readonly MAX_UPGRADES_PER_MINUTE = 20;
    static readonly MAX_UPLOADS_PER_MINUTE = 10;
    private readonly app;
    private readonly httpServer;
    private readonly wss;
    private readonly wsCreateSecLimiter;
    private readonly wsCreateMinLimiter;
    private readonly fileUploadLimiter;
    constructor();
    start(): void;
    private getExpressApp;
    private onServerUpgradeRequest;
    /**
     * On file upload
     */
    onFileUpload(req: express.Request, res: express.Response): Promise<void>;
}