/// <reference types="node" />
import * as net from 'net';
import { Agent as HttpAgent } from 'http';
import { Agent as HttpsAgent } from 'https';
import { LookupFunction } from './happy-eyeballs';
import { ClientRequestArgs } from './interfaces';
export declare const core: {
    https: any;
    http: ((options: import("http").ClientRequestArgs, oncreate: (err: Error, socket: net.Socket) => void) => net.Socket) & {
        lookup?: LookupFunction | undefined;
    };
};
export declare type ConnectionCb = (error: Error | null | undefined, socket?: net.Socket) => net.Socket | undefined;
export declare type Agent = (HttpAgent | HttpsAgent);
export declare type HappyRequestArgs = ClientRequestArgs & {
    lookup?: LookupFunction;
};
export declare function createConnection(options: HappyRequestArgs, oncreate: (err: Error, socket: net.Socket) => void): net.Socket;
export declare function createConnection(port: number, host?: string, oncreate?: (err: Error, socket: net.Socket) => void): net.Socket;
export declare function createConnection(path: string, oncreate?: (err: Error, socket: net.Socket) => void): net.Socket;