C++ forward declarations for godot classes

Are there C++ forward declarations for godot classes?

Background: when declaring, in a header file, a class member that is a pointer to a godot class, e.g. ::godot::Node * pointerToNode, I need to either #include <godot_cpp/classes/node.hpp> or add something like

namespace godot
{
  class Node;
}

I prefer the latter, because the #include slows down compilation. A godot header file with forward declarations for all godot classes would be nice.