`ts
// Type definitions for sockjs 0.3
// Project: https://github.com/sockjs/sockjs-node
// Definitions by: Phil McCloghry-Laing <https://github.com/pmccloghrylaing>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped

/// <reference types="node" />

import http = require('http');

export interface ServerOptions {
    sockjs_url?: string | undefined;
    prefix?: string | undefined;
    response_limit?: number | undefined;
    websocket?: boolean | undefined;
    jsessionid?: any;
    log?(severity: string, message: string): void;
    heartbeat_delay?: number | undefined;
    disconnect_delay?: number | undefined;
}

export function createServer(options?: ServerOptions): Server;

export interface Server extends NodeJS.EventEmitter {
    installHandlers(server: http.Server, options?: ServerOptions): any;

    on(event: 'connection', listener: (conn: Connection) => any): this;
    on(event: string, listener: Function): this;
}

export interface Connection extends NodeJS.ReadWriteStream {
    remoteAddress: string;
    remotePort: number;
    address: {
        [key: string]: {
            address: string;
            port: number;
        };
    };
    headers: {
        [key: string]: string;
    };
    url: string;
    pathname: string;
    prefix: string;
    protocol: string;
    readyState: number;
    id: string;

    close(code?: string, reason?: string): boolean;
    destroy(): void;

    on(event: 'data', listener: (message: string) => any): this;
    on(event: 'close', listener: () => void): this;
    on(event: string, listener: Function): this;
}

`