Use IWYU.

src/ftxui/screen/color.cpp

@@ -1,7 +1,4 @@
 #include "ftxui/screen/color.hpp"
-
-#include <algorithm>
-
 #include "ftxui/screen/color_info.hpp"
 #include "ftxui/screen/string.hpp"
 #include "ftxui/screen/terminal.hpp"

src/ftxui/screen/color_info.cpp

@@ -1,4 +1,5 @@
 #include "ftxui/screen/color_info.hpp"
+#include "ftxui/screen/color.hpp"  // for Color, Color::Palette16, Color::Palette256
 
 namespace ftxui {
 

src/ftxui/screen/screen.cpp

@@ -1,12 +1,12 @@
+#include <algorithm>  // for min
+#include <iostream>  // for operator<<, basic_ostream, wstringstream, stringstream, flush, cout, ostream
+#include <sstream>   // IWYU pragma: keep
+
+#include "ftxui/dom/node.hpp"         // for Element, Node
+#include "ftxui/dom/requirement.hpp"  // for Requirement
 #include "ftxui/screen/screen.hpp"
-
-#include <algorithm>
-#include <sstream>
-#include <iostream>
-
-#include "ftxui/dom/node.hpp"
-#include "ftxui/screen/string.hpp"
-#include "ftxui/screen/terminal.hpp"
+#include "ftxui/screen/string.hpp"    // for to_string, wchar_width
+#include "ftxui/screen/terminal.hpp"  // for Terminal::Dimensions, Terminal
 
 #if defined(_WIN32)
 #define WIN32_LEAN_AND_MEAN
@@ -169,9 +169,9 @@ std::string Screen::ToString() {
 
       auto width = wchar_width(c);
       if (width <= 0) {
-          // Avoid an infinite loop for non-printable characters
-          c = L' ';
-          width = 1;
+        // Avoid an infinite loop for non-printable characters
+        c = L' ';
+        width = 1;
       }
       ss << c;
       x += width;

src/ftxui/screen/terminal.cpp

@@ -1,20 +1,17 @@
+#include <cstdlib>  // for getenv
+#include <string>   // for string, allocator
+
 #include "ftxui/screen/terminal.hpp"
 
-#include <stdio.h>
-
-#include <cstdlib>
-
 #if defined(_WIN32)
 #define WIN32_LEAN_AND_MEAN
 #define NOMINMAX
 #include <Windows.h>
 #else
-#include <sys/ioctl.h>
-#include <unistd.h>
+#include <sys/ioctl.h>  // for winsize, ioctl, TIOCGWINSZ
+#include <unistd.h>     // for STDOUT_FILENO
 #endif
 
-#include <iostream>
-
 namespace ftxui {
 
 Terminal::Dimensions Terminal::Size() {

src/ftxui/screen/wcwidth.cpp

@@ -59,7 +59,7 @@
  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
  */
 
-#include <wchar.h>
+#include <string>
 
 #include "ftxui/screen/string.hpp"