code: function checkAvailability(fullGetterName) {
    if (composerMap.hasOwnProperty(fullGetterName) || shadowMap.hasOwnProperty(fullGetterName)) {
      console.trace('Duplicate Getter Method name', fullGetterName);
      throw 'Duplicate Getter Method Name ';
    }
  }
docs: Check if full getter name is available
  
  @param fullGetterName {string} - full getter name
  
  Throws error if fullGetterName is not available, i.e. already taken.