Use IWYU.

include/ftxui/dom/elements.hpp

@@ -78,7 +78,7 @@ enum Direction { WIDTH, HEIGHT };
 enum Constraint { LESS_THAN, EQUAL, GREATER_THAN };
 Decorator size(Direction, Constraint, int value);
 
-// -- 
+// --
 Decorator reflect(Box& box);
 
 // --- Frame ---

include/ftxui/dom/node.hpp

@@ -1,16 +1,18 @@
 #ifndef FTXUI_DOM_NODE_HPP
 #define FTXUI_DOM_NODE_HPP
 
-#include <memory>
-#include <vector>
+#include <memory>  // for shared_ptr
+#include <vector>  // for vector
 
-#include "ftxui/dom/requirement.hpp"
-#include "ftxui/screen/box.hpp"
+#include "ftxui/dom/requirement.hpp"  // for Requirement
+#include "ftxui/screen/box.hpp"       // for Box
 #include "ftxui/screen/screen.hpp"
 
 namespace ftxui {
 
 class Node;
+class Screen;
+
 using Element = std::shared_ptr<Node>;
 using Elements = std::vector<std::shared_ptr<Node>>;
 

include/ftxui/dom/take_any_args.hpp

@@ -1,3 +1,4 @@
+// IWYU pragma: private, include "ftxui/dom/elements.hpp"
 #include <type_traits>
 
 template <class T>