diff --git a/src/fmt.cc b/src/fmt.cc
new file mode 100644
index 0000000000000..0bf7686c902df
--- /dev/null
+++ b/src/fmt.cc
@@ -0,0 +1,85 @@
+module;
+#ifndef FMT_MODULE_NAME
+#define FMT_MODULE_NAME fmt
+#endif
+// put all implementation-provided headers into the global module fragment
+// to prevent attachment to this module
+#include <cctype>
+#include <cerrno>
+#include <climits>
+#include <cmath>
+#include <cstdarg>
+#include <cstddef>
+#include <cstdint>
+#include <cstdio>
+#include <cstring>
+#include <ctime>
+#include <cwchar>
+
+#include <algorithm>
+#include <chrono>
+#include <exception>
+#include <functional>
+#include <initializer_list>
+#include <iterator>
+#include <limits>
+#include <locale>
+#include <memory>
+#include <ostream>
+#include <sstream>
+#include <stdexcept>
+#include <string>
+#include <string_view>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#if _MSC_VER
+#  include <intrin.h>  // _BitScanReverse[64], _BitScanForward[64], _umul128
+#endif
+#ifdef _WIN32
+#  include <io.h>
+#endif
+
+// os.h
+#ifdef FMT_WITH_OS
+  #include <cstdlib>
+  #include <clocale>
+  #if __has_include(<winapifamily.h>)
+    #include <winapifamily.h>
+  #endif
+  #if __has_include(<fcntl.h>)
+    #include <fcntl.h>
+  #endif
+#endif
+
+export module FMT_MODULE_NAME;
+
+#define FMT_MODULE_EXPORT export
+#define FMT_MODULE_EXPORT_BEGIN export {
+#define FMT_MODULE_EXPORT_END }
+
+#define FMT_USE_NONTYPE_TEMPLATE_PARAMETERS 1
+
+// all library-provided declarations and definitions
+// must be in the module purview to be exported
+#include "fmt/format.h"
+#include "fmt/args.h"
+#include "fmt/color.h"
+#include "fmt/compile.h"
+#include "fmt/locale.h"
+#include "fmt/ostream.h"
+#include "fmt/ranges.h"
+#include "fmt/chrono.h"
+#include "fmt/printf.h"
+
+#ifdef FMT_MODULE_WITH_OS
+#include "fmt/os.h"
+#endif
+
+module : private;
+
+#include "format.cc"
+#ifdef FMT_MODULE_WITH_OS
+#include "os.cc"
+#endif