How to use the socks.SocksClient function in socks

/**
 * Module dependencies.
 */

var tls; // lazy-loaded...
var url = require('url');
var dns = require('dns');
var Agent = require('agent-base');
var SocksClient = require('socks').SocksClient;
var inherits = require('util').inherits;

/**
 * Module exports.
 */

module.exports = SocksProxyAgent;

/**
 * The `SocksProxyAgent`.
 *
 * @api public
 */

function SocksProxyAgent(opts) {
	if (!(this instanceof SocksProxyAgent)) return new SocksProxyAgent(opts);

var socks = require('socks').SocksClient;
var toPull = require('stream-to-pull-stream')

module.exports = function (opts) {
  if(!socks) { //we are in browser
    console.warn('onion dialing through socks proxy not supported in browser setting')
    return {
      name: 'onion',
      scope: function() { return 'public' },
      parse: function (s) { return null }
    }
  }

  opts = opts || {}
  var proxyOpts = {
    ipaddress: "127.0.0.1",
    //TODO: tor port should be configurable.