@Override
  public Void visitClassTypeAlias(ClassTypeAlias node) {
    ElementHolder holder = new ElementHolder();
    functionTypesToFix = new ArrayList<FunctionTypeImpl>();
    visitChildren(holder, node);

    SimpleIdentifier className = node.getName();
    ClassElementImpl element = new ClassElementImpl(className);
    element.setAbstract(node.getAbstractKeyword() != null);
    element.setTypedef(true);
    TypeParameterElement[] typeParameters = holder.getTypeParameters();
    element.setTypeParameters(typeParameters);

    Type[] typeArguments = createTypeParameterTypes(typeParameters);
    InterfaceTypeImpl interfaceType = new InterfaceTypeImpl(element);
    interfaceType.setTypeArguments(typeArguments);
    element.setType(interfaceType);

    // set default constructor
    element.setConstructors(createDefaultConstructors(interfaceType));

    for (FunctionTypeImpl functionType : functionTypesToFix) {
      functionType.setTypeArguments(typeArguments);
    }
    functionTypesToFix = null;
    currentHolder.addType(element);
    className.setStaticElement(element);
    holder.validate();
    return null;
  }
  @Override
  public Void visitClassDeclaration(ClassDeclaration node) {
    ElementHolder holder = new ElementHolder();
    isValidMixin = true;
    functionTypesToFix = new ArrayList<FunctionTypeImpl>();
    visitChildren(holder, node);

    SimpleIdentifier className = node.getName();
    ClassElementImpl element = new ClassElementImpl(className);
    TypeParameterElement[] typeParameters = holder.getTypeParameters();

    Type[] typeArguments = createTypeParameterTypes(typeParameters);
    InterfaceTypeImpl interfaceType = new InterfaceTypeImpl(element);
    interfaceType.setTypeArguments(typeArguments);
    element.setType(interfaceType);

    ConstructorElement[] constructors = holder.getConstructors();
    if (constructors.length == 0) {
      //
      // Create the default constructor.
      //
      constructors = createDefaultConstructors(interfaceType);
    }
    element.setAbstract(node.getAbstractKeyword() != null);
    element.setAccessors(holder.getAccessors());
    element.setConstructors(constructors);
    element.setFields(holder.getFields());
    element.setMethods(holder.getMethods());
    element.setTypeParameters(typeParameters);
    element.setValidMixin(isValidMixin);

    int functionTypeCount = functionTypesToFix.size();
    for (int i = 0; i < functionTypeCount; i++) {
      functionTypesToFix.get(i).setTypeArguments(typeArguments);
    }
    functionTypesToFix = null;
    currentHolder.addType(element);
    className.setStaticElement(element);
    holder.validate();
    return null;
  }