old_contents: 'use strict';
  
  (function () {
  
    var utils = require('./utils');
    var getNodeProperties = utils.getNodeProperties;
    var validateName = utils.validateName;
    var serializeOptions = utils.serializeOptions;
  
    var validOptions = {
      alias: {
        type: 'string'
      },
      description: {
        type: 'string'
      },
      options: {
        type: 'array'
      }
    };
  
    function Arg () {
      var properties = getNodeProperties(arguments);
      validateName(properties.name);
      serializeOptions(properties.options, validOptions);
  
      properties._type = 'arg';
  
      return properties;
    }
  
    module.exports = Arg;
  
  })();
  
new_contents: 'use strict';
  
  (function () {
  
    var utils = require('./utils');
    var getNodeProperties = utils.getNodeProperties;
    var validateName = utils.validateName;
    var serializeOptions = utils.serializeOptions;
  
    var validOptions = {
      description: {
        type: 'string'
      },
      options: {
        type: 'array'
      }
    };
  
    function Arg () {
      var properties = getNodeProperties(arguments);
      validateName(properties.name);
      serializeOptions(properties.options, validOptions);
  
      properties._type = 'arg';
  
      return properties;
    }
  
    module.exports = Arg;
  
  })();
  
subject: Remove alias option from Arg