import { Handlers } from '../helper/handlers';
import { Handler, HandlerResolve } from '../helper/handler';
import { AuthMethod } from '../helper/authMethod';
import { ObfsBuilder } from '../obfs/obfs';
/**
 *  The Client class is responsible for creating a TCP socket connection,
 *  and communicate with a standard SOCKS server
 */
export declare class Client {
    /**
     * SOCKS server host
     */
    private readonly host;
    /**
     * SOCKS server port
     */
    private readonly port;
    /**
     * The object which contains all default handlers
     */
    private readonly handlers;
    /**
     * The main event object
     */
    private readonly event;
    /**
     * Server protocol version
     */
    private readonly version;
    /**
     * userId for identification in v4
     */
    private readonly userId?;
    obfs: ObfsBuilder;
    constructor(port: number, host: string, version: 4 | 5, obfs: ObfsBuilder, userId?: string);
    /**
     * The connector method establishes a TCP connection to the proxy server
     * @param port - Proxy server port
     * @param host - Proxy server host
     * @param cmd - Request command
     * @param resolve - This function fires after the server response
     * @param reject - This function fires after the server response if any error occurs
     * @param version - SOCKS version
     * @param userId - UserId for identification in SOCKS4
     */
    private connector;
    /**
     * Sends a bind request
     * @param port - Target port
     * @param host - Target host address
     * @param version - Server protocol version
     * @returns void
     */
    bind(port: number, host: string, version?: 4 | 5, userId?: string): Promise<HandlerResolve>;
    /**
     * Sends an associate request
     * @param port - Target port
     * @param host - Target host address
     * @param version - Server protocol version
     * @returns void
     */
    associate(port: number, host: string, version?: 4 | 5): Promise<HandlerResolve>;
    /**
     * Sends a connect request
     * @param port - Target port
     * @param host - Target host address
     * @param version - Server protocol version
     * @param userId - userId for identification in v4
     * @returns void
     */
    connect(port: number, host: string, version?: 4 | 5, userId?: string): Promise<HandlerResolve>;
    /**
     * Get the handler function, and push it into this.handlers.req
     * @param handler - Emitted when the socks5 client sends an authentication request
     * @returns Client
     */
    useAuth(handler: AuthMethod): Client;
    /**
     * Get the handler function, and update this.handlers.req
     * @param cmd - Specify handler type (connect | associate | bind)
     * @param handler - Emitted when new request appears
     * @returns Server
     */
    useReq(cmd: keyof Handlers['req'], handler: Handler): Client;
    /**
     * Get the handler function, and update this.handlers.obfs
     * @param handler - Emitted when new request appears
     * @returns Server
     */
    useObfs(handler: ObfsBuilder): Client;
}
/**
 * Open new connection and connect to server
 * @param port - Server port
 * @param host - Server address
 * @param version - Server protocol version
 * @param obfs - Obfuscation Method
 * @param userId - userId for identification in v4
 * @returns void
 */
export declare const connect: (port: number, host: string, version: 4 | 5, userId?: string) => Client;