How to use the tls.connect function in tls

var initSocket = function(){
        _socket = tls.connect(4000,"localhost", options, startSuccess);
        _socket.on('error',function(){
            console.log('error connecting susi...');
            setTimeout(initSocket,500);
        }); 
        _socket.on('close',function(){
            console.log('error connecting susi...');
            setTimeout(initSocket,500);
        });        
    };
    initSocket();

this.ssl_load (function (options) {
			connection = tls.connect (this.port, this.host, options);
			setup (connection);
		});
	} else {

function connectSslSocket(fulfill, reject, conn) {
      var sslOpts = transport.sslOpts();
      var options = sslSocketOpts(sslOpts, reject);
      var localSock = tls.connect(addr.port, addr.host, options, function() {
        logger.debugf('Connecting via SSL to %s, socket is %s, server name is: `%s`', show(),
                      localSock.authorized ? 'authorized' : 'unauthorized',
                      localSock.servername);
        fulfill(conn);
      });
      return localSock;
    }

function getSocket(context) {
    var socket = tls.connect({ port: DD_PORT, host: DD_URL });
    socket.on('error', err => {
        context.log.error(err.toString());
        socket.end();
    });

    return socket;
}

function getSocket(context) {
    var socket = tls.connect({ port: DD_PORT, host: DD_URL });
    socket.on('error', err => {
        context.log.error(err.toString());
        socket.end();
    });

    return socket;
}