code: function(name, factory) {
  			// do not let redefine existing properties
  			if (!(name in modules)) {
  				modules[name] = _.isFunction(factory) 
  					? this.exec(factory)
  					: factory;
  			}
  		}
docs: Simple, AMD-like module definition. The module will be added into
  <code>emmet</code> object and will be available via
  <code>emmet.require(name)</code> or <code>emmet[name]</code>
  @param {String} name
  @param {Function} factory
  @memberOf emmet