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There is a newer version: 5.0.0.CR1

(function () {
  var VertxTerm = function (url, element, options) {
    options = options || {};
    var term = new Terminal(options);
    term.open(element, true);

    var socket;
    var initialResize = true;
    var onResize = function (size) {
      var cols = size.cols, rows = size.rows;
      if (initialResize) {
        initialResize = false;
        url += (url.indexOf('?') > -1 ? '&' : '?') + "cols=" + cols + "&rows=" + rows;
        if (url.substring(0, 2) === 'ws') {
          socket = new WebSocket(url);
          socket.binaryType = 'blob';
        } else {
          socket = new SockJS(url);
        }
        socket.onopen = function () {
          socket.onmessage = function (event) {
            if (event.type === 'message') {
              if (typeof event.data !== 'string') {
                var reader = new FileReader();
                reader.onloadend = function () {
                  term.write(reader.result);
                };
                reader.readAsText(event.data);
              } else {
                term.write(event.data);
              }
            }
          };
          socket.onclose = function () {
            socket.onmessage = null;
            socket.onclose = null;
            term.destroy();
          };
          term.on('data', function (data) {
            socket.send(JSON.stringify({action: 'read', data: data}));
          });
        };
      } else {
        socket.send(JSON.stringify({action: 'resize', cols: cols, rows: rows}));
      }
    };

    term.on('resize', onResize);
    if (options.cols && options.rows) {
      onResize(options);
    }

    return {
      socket: socket,
      term: term
    };
  };

  if (typeof module !== 'undefined') {
    module.exports = VertxTerm;
  } else {
    this.VertxTerm = VertxTerm;
  }
})();