import { RequestProxy } from './request_proxy';
export declare class ProxyBuilder {
    private _host;
    private _port;
    private _user?;
    private _password?;
    host(host: string): ProxyBuilder;
    port(port: number): ProxyBuilder;
    user(user?: string): ProxyBuilder;
    password(password?: string): ProxyBuilder;
    build(): RequestProxy;
}