Use IWYU.

include/ftxui/component/mouse.hpp

@@ -1,3 +1,5 @@
+#ifndef FTXUI_COMPONENT_MOUSE_HPP
+#define FTXUI_COMPONENT_MOUSE_HPP
 namespace ftxui {
 
 /// @brief A mouse event. It contains the coordinate of the mouse, the button
@@ -39,3 +41,4 @@ struct Mouse {
 // Copyright 2020 Arthur Sonzogni. All rights reserved.
 // Use of this source code is governed by the MIT license that can be found in
 // the LICENSE file.
+#endif /* end of include guard: FTXUI_COMPONENT_MOUSE_HPP */