code: function defineModule(namespace, moduleDefinition) {
      var base = moduleDefinition || {};
  
      if (type.isFunction(base[INITIALIZATION_METHOD_NAME])) {
          base[INITIALIZATION_METHOD_NAME]();
      }
  
      return defineNamespace(namespace, base);
  }
docs: Define module
  @param {string} namespace - Namespace of module
  @param {Object} moduleDefinition - Object literal for module
  @returns {Object} Defined module
  @memberof tui.util
  @example
  //-- #1. Get Module --//
  var util = require('tui-code-snippet'); // node, commonjs
  var util = tui.util; // distribution file
  
  //-- #2. Use property --//
  var myModule = util.defineModule('modules.myModule', {
  name: 'john',
  message: '',
  initialize: function() {
  this.message = 'hello world';
  },
  getMessage: function() {
  return this.name + ': ' + this.message
  }
  });
  
  console.log(myModule.getMessage());  // 'john: hello world';