/// <reference types="node" />
import * as tls from 'tls';
export interface HttpsProxyConfig extends tls.ConnectionOptions {
    headers?: {
        [key: string]: string;
    };
    auth?: string;
}
export interface ConnectionOptions {
    host: string;
    port: number;
}
/**
 * The HttpsProxySocket class allows creating Socket connections via an HTTPS proxy.
 * HTTP proxies are not supported.
 * For http(s) requests, use HttpsProxyAgent as a wrapper around this.
 */
export declare class HttpsProxySocket {
    proxy: tls.ConnectionOptions;
    proxyConfig: HttpsProxyConfig;
    /**
     *
     * @param opts - The connection options to the proxy. At least host and port are required.
     *               Use {rejectUnauthorized: true} to ignore certificates for the proxy (not the endpoint).
     * @param proxyConfig - { auth: 'username:password' } for basic auth.
     *                      { headers: {key: 'value'} } for custom headers.
     */
    constructor(opts: tls.ConnectionOptions | string, proxyConfig?: HttpsProxyConfig);
    /**
     * Create a new Socket connection.
     *
     * @param opts - host and port
     */
    connect(opts: ConnectionOptions): Promise<tls.TLSSocket>;
    /**
     * Construct an agent for http(s) requests.
     *
     * @param options - to set additional TLS options for https requests, e.g. rejectUnauthorized
     */
    agent(options?: tls.ConnectionOptions): import("agent-base").Agent;
    private _connect;
}