How to use the ssh2-streams.SSH2Stream function in ssh2-streams

var crypto = require('crypto');
var Socket = require('net').Socket;
var dnsLookup = require('dns').lookup;
var EventEmitter = require('events').EventEmitter;
var inherits = require('util').inherits;
var HASHES = crypto.getHashes();

var ssh2_streams = require('ssh2-streams');
var SSH2Stream = ssh2_streams.SSH2Stream;
var SFTPStream = ssh2_streams.SFTPStream;
var consts = ssh2_streams.constants;
var BUGS = consts.BUGS;
var ALGORITHMS = consts.ALGORITHMS;
var EDDSA_SUPPORTED = consts.EDDSA_SUPPORTED;
var parseKey = ssh2_streams.utils.parseKey;

var HTTPAgents = require('./http-agents');
var Channel = require('./Channel');
var agentQuery = require('./agent');
var SFTPWrapper = require('./SFTPWrapper');
var readUInt32BE = require('./buffer-helpers').readUInt32BE;

var MAX_CHANNEL = Math.pow(2, 32) - 1;
var RE_OPENSSH = /^OpenSSH_(?:(?![0-4])\d)|(?:\d{2,})/;
var DEBUG_NOOP = function(msg) {};

var net = require('net');
var EventEmitter = require('events').EventEmitter;
var listenerCount = EventEmitter.listenerCount;
var inherits = require('util').inherits;

var ssh2_streams = require('ssh2-streams');
var parseKey = ssh2_streams.utils.parseKey;
var SSH2Stream = ssh2_streams.SSH2Stream;
var SFTPStream = ssh2_streams.SFTPStream;
var consts = ssh2_streams.constants;
var DISCONNECT_REASON = consts.DISCONNECT_REASON;
var CHANNEL_OPEN_FAILURE = consts.CHANNEL_OPEN_FAILURE;
var ALGORITHMS = consts.ALGORITHMS;

var Channel = require('./Channel');
var KeepaliveManager = require('./keepalivemgr');
var writeUInt32BE = require('./buffer-helpers').writeUInt32BE;

var MAX_CHANNEL = Math.pow(2, 32) - 1;
var MAX_PENDING_AUTHS = 10;

var kaMgr;

function Server(cfg, listener) {