code: function () {
  			var oCore = sap.ui.getCore();
  			var oAlreadyLoadedLibraries = oCore.getLoadedLibraries();
  			var aPromises = [];
  
  			jQuery.each(oAlreadyLoadedLibraries, function (sLibraryName, oLibrary) {
  				if (oLibrary.extensions && oLibrary.extensions.flChangeHandlers) {
  					aPromises.push(this._registerFlexChangeHandlers(oLibrary.extensions.flChangeHandlers));
  				}
  			}.bind(this));
  
  			oCore.attachLibraryChanged(this._handleLibraryRegistrationAfterFlexLibraryIsLoaded.bind(this));
  
  			return Promise.all(aPromises);
  		}
docs: Detects already loaded libraries and registers defined changeHandlers.
  
  @returns {Promise} Returns an empty promise when all changeHandlers from all liblraries are registered.