diff --git a/CLI/src/Flags.cpp b/CLI/src/Flags.cpp
index 4bdad341..290d147b 100644
--- a/CLI/src/Flags.cpp
+++ b/CLI/src/Flags.cpp
@@ -1,4 +1,6 @@
 // This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
+#include "luacommon.h"
+
 #include "Luau/Common.h"
 #include "Luau/ExperimentalFlags.h"
 
@@ -9,16 +11,8 @@
 
 static void setLuauFlag(std::string_view name, bool state)
 {
-    for (Luau::FValue<bool>* flag = Luau::FValue<bool>::list; flag; flag = flag->next)
-    {
-        if (name == flag->name)
-        {
-            flag->value = state;
-            return;
-        }
-    }
-
-    fprintf(stderr, "Warning: unrecognized flag '%.*s'.\n", int(name.length()), name.data());
+    if (!luau_setfflag(name.data(), state))
+        fprintf(stderr, "Warning: unrecognized flag '%.*s'.\n", int(name.length()), name.data());
 }
 
 static void setLuauFlags(bool state)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 220031e2..6860c410 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ if(LUAU_STATIC_CRT)
 endif()
 
 project(Luau LANGUAGES CXX C)
-add_library(Luau.Common INTERFACE)
+add_library(Luau.Common STATIC)
 add_library(Luau.CLI.lib STATIC)
 add_library(Luau.Ast STATIC)
 add_library(Luau.Compiler STATIC)
@@ -65,7 +65,9 @@ add_library(Luau.VM.Internals INTERFACE)
 
 include(Sources.cmake)
 
-target_include_directories(Luau.Common INTERFACE Common/include)
+target_compile_features(Luau.Common PUBLIC cxx_std_17)
+target_include_directories(Luau.Common PUBLIC Common/include)
+target_link_libraries(Luau.Common)
 
 target_compile_features(Luau.CLI.lib PUBLIC cxx_std_17)
 target_include_directories(Luau.CLI.lib PUBLIC CLI/include)
@@ -164,6 +166,7 @@ if(LUAU_EXTERN_C)
     target_compile_definitions(Luau.VM PUBLIC LUA_API=extern\"C\")
     target_compile_definitions(Luau.Compiler PUBLIC LUACODE_API=extern\"C\")
     target_compile_definitions(Luau.CodeGen PUBLIC LUACODEGEN_API=extern\"C\")
+    target_compile_definitions(Luau.Common PUBLIC LUACOMMON_API=extern\"C\")
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND MSVC_VERSION GREATER_EQUAL 1924)
diff --git a/Common/include/luacommon.h b/Common/include/luacommon.h
new file mode 100644
index 00000000..49d55f3e
--- /dev/null
+++ b/Common/include/luacommon.h
@@ -0,0 +1,10 @@
+// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
+#pragma once
+
+// Can be used to reconfigure visibility/exports for public APIs
+#ifndef LUACOMMON_API
+#define LUACOMMON_API extern
+#endif
+
+// sets a bool fast flag value (returns 1 if the flag was found, 0 otherwise)
+LUACOMMON_API int luau_setfflag(const char* name, int value);
diff --git a/Common/src/lflags.cpp b/Common/src/lflags.cpp
new file mode 100644
index 00000000..8f7cade9
--- /dev/null
+++ b/Common/src/lflags.cpp
@@ -0,0 +1,19 @@
+// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
+#include "luacommon.h"
+
+#include "Luau/Common.h"
+
+#include <string.h>
+
+int luau_setfflag(const char* name, int value)
+{
+    for (Luau::FValue<bool>* flag = Luau::FValue<bool>::list; flag; flag = flag->next)
+    {
+        if (strcmp(flag->name, name) == 0)
+        {
+            flag->value = value;
+            return 1;
+        }
+    }
+    return 0;
+}
diff --git a/Makefile b/Makefile
index 2ad0fc00..75935db7 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,10 @@ AST_SOURCES=$(wildcard Ast/src/*.cpp)
 AST_OBJECTS=$(AST_SOURCES:%=$(BUILD)/%.o)
 AST_TARGET=$(BUILD)/libluauast.a
 
+COMMON_SOURCES=$(wildcard Common/src/*.cpp)
+COMMON_OBJECTS=$(COMMON_SOURCES:%=$(BUILD)/%.o)
+COMMON_TARGET=$(BUILD)/libluaucommon.a
+
 COMPILER_SOURCES=$(wildcard Compiler/src/*.cpp)
 COMPILER_OBJECTS=$(COMPILER_SOURCES:%=$(BUILD)/%.o)
 COMPILER_TARGET=$(BUILD)/libluaucompiler.a
@@ -73,7 +77,7 @@ ifneq ($(opt),)
 	TESTS_ARGS+=-O$(opt)
 endif
 
-OBJECTS=$(AST_OBJECTS) $(COMPILER_OBJECTS) $(CONFIG_OBJECTS) $(ANALYSIS_OBJECTS) $(EQSAT_OBJECTS) $(CODEGEN_OBJECTS) $(VM_OBJECTS) $(ISOCLINE_OBJECTS) $(TESTS_OBJECTS) $(REPL_CLI_OBJECTS) $(ANALYZE_CLI_OBJECTS) $(COMPILE_CLI_OBJECTS) $(BYTECODE_CLI_OBJECTS) $(FUZZ_OBJECTS)
+OBJECTS=$(AST_OBJECTS) $(COMMON_OBJECTS) $(COMPILER_OBJECTS) $(CONFIG_OBJECTS) $(ANALYSIS_OBJECTS) $(EQSAT_OBJECTS) $(CODEGEN_OBJECTS) $(VM_OBJECTS) $(ISOCLINE_OBJECTS) $(TESTS_OBJECTS) $(REPL_CLI_OBJECTS) $(ANALYZE_CLI_OBJECTS) $(COMPILE_CLI_OBJECTS) $(BYTECODE_CLI_OBJECTS) $(FUZZ_OBJECTS)
 EXECUTABLE_ALIASES = luau luau-analyze luau-compile luau-bytecode luau-tests
 
 # common flags
@@ -142,6 +146,7 @@ endif
 
 # target-specific flags
 $(AST_OBJECTS): CXXFLAGS+=-std=c++17 -ICommon/include -IAst/include
+$(COMMON_OBJECTS): CXXFLAGS+=-std=c++17 -ICommon/include
 $(COMPILER_OBJECTS): CXXFLAGS+=-std=c++17 -ICompiler/include -ICommon/include -IAst/include
 $(CONFIG_OBJECTS): CXXFLAGS+=-std=c++17 -IConfig/include -ICommon/include -IAst/include
 $(ANALYSIS_OBJECTS): CXXFLAGS+=-std=c++17 -ICommon/include -IAst/include -IAnalysis/include -IEqSat/include -IConfig/include -ICompiler/include -IVM/include
@@ -227,24 +232,25 @@ luau-tests: $(TESTS_TARGET)
 	ln -fs $^ $@
 
 # executable targets
-$(TESTS_TARGET): $(TESTS_OBJECTS) $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMPILER_TARGET) $(CONFIG_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET) $(ISOCLINE_TARGET)
-$(REPL_CLI_TARGET): $(REPL_CLI_OBJECTS) $(COMPILER_TARGET) $(CONFIG_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET) $(ISOCLINE_TARGET)
-$(ANALYZE_CLI_TARGET): $(ANALYZE_CLI_OBJECTS) $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(COMPILER_TARGET) $(VM_TARGET)
-$(COMPILE_CLI_TARGET): $(COMPILE_CLI_OBJECTS) $(COMPILER_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET)
-$(BYTECODE_CLI_TARGET): $(BYTECODE_CLI_OBJECTS) $(COMPILER_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET)
+$(TESTS_TARGET): $(TESTS_OBJECTS) $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMMON_TARGET) $(COMPILER_TARGET) $(CONFIG_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET) $(ISOCLINE_TARGET)
+$(REPL_CLI_TARGET): $(REPL_CLI_OBJECTS) $(COMMON_TARGET) $(COMPILER_TARGET) $(CONFIG_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET) $(ISOCLINE_TARGET)
+$(ANALYZE_CLI_TARGET): $(ANALYZE_CLI_OBJECTS) $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(COMMON_TARGET) $(COMPILER_TARGET) $(VM_TARGET)
+$(COMPILE_CLI_TARGET): $(COMPILE_CLI_OBJECTS) $(COMMON_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET)
+$(BYTECODE_CLI_TARGET): $(BYTECODE_CLI_OBJECTS) $(COMMON_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CODEGEN_TARGET) $(VM_TARGET)
 
 $(TESTS_TARGET) $(REPL_CLI_TARGET) $(ANALYZE_CLI_TARGET) $(COMPILE_CLI_TARGET) $(BYTECODE_CLI_TARGET):
 	$(CXX) $^ $(LDFLAGS) -o $@
 
 # executable targets for fuzzing
-fuzz-%: $(BUILD)/fuzz/%.cpp.o $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(CODEGEN_TARGET) $(VM_TARGET)
+fuzz-%: $(BUILD)/fuzz/%.cpp.o $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMMON_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(CODEGEN_TARGET) $(VM_TARGET)
 	$(CXX) $^ $(LDFLAGS) -o $@
 
-fuzz-proto: $(BUILD)/fuzz/proto.cpp.o $(BUILD)/fuzz/protoprint.cpp.o $(BUILD)/fuzz/luau.pb.cpp.o $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(VM_TARGET) | build/libprotobuf-mutator
-fuzz-prototest: $(BUILD)/fuzz/prototest.cpp.o $(BUILD)/fuzz/protoprint.cpp.o $(BUILD)/fuzz/luau.pb.cpp.o $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(VM_TARGET) | build/libprotobuf-mutator
+fuzz-proto: $(BUILD)/fuzz/proto.cpp.o $(BUILD)/fuzz/protoprint.cpp.o $(BUILD)/fuzz/luau.pb.cpp.o $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMMON_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(VM_TARGET) | build/libprotobuf-mutator
+fuzz-prototest: $(BUILD)/fuzz/prototest.cpp.o $(BUILD)/fuzz/protoprint.cpp.o $(BUILD)/fuzz/luau.pb.cpp.o $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(COMMON_TARGET) $(COMPILER_TARGET) $(AST_TARGET) $(CONFIG_TARGET) $(VM_TARGET) | build/libprotobuf-mutator
 
 # static library targets
 $(AST_TARGET): $(AST_OBJECTS)
+$(COMMON_TARGET): $(COMMON_OBJECTS)
 $(COMPILER_TARGET): $(COMPILER_OBJECTS)
 $(CONFIG_TARGET): $(CONFIG_OBJECTS)
 $(ANALYSIS_TARGET): $(ANALYSIS_OBJECTS)
@@ -253,7 +259,7 @@ $(CODEGEN_TARGET): $(CODEGEN_OBJECTS)
 $(VM_TARGET): $(VM_OBJECTS)
 $(ISOCLINE_TARGET): $(ISOCLINE_OBJECTS)
 
-$(AST_TARGET) $(COMPILER_TARGET) $(CONFIG_TARGET) $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(CODEGEN_TARGET) $(VM_TARGET) $(ISOCLINE_TARGET):
+$(AST_TARGET) $(COMMON_TARGET) $(COMPILER_TARGET) $(CONFIG_TARGET) $(ANALYSIS_TARGET) $(EQSAT_TARGET) $(CODEGEN_TARGET) $(VM_TARGET) $(ISOCLINE_TARGET):
 	ar rcs $@ $^
 
 # object file targets
diff --git a/Sources.cmake b/Sources.cmake
index a40505df..bd47e86d 100644
--- a/Sources.cmake
+++ b/Sources.cmake
@@ -1,16 +1,16 @@
 # Luau.Common Sources
-# Note: Until 3.19, INTERFACE targets couldn't have SOURCES property set
-if(NOT ${CMAKE_VERSION} VERSION_LESS "3.19")
-    target_sources(Luau.Common PRIVATE
-        Common/include/Luau/Common.h
-        Common/include/Luau/Bytecode.h
-        Common/include/Luau/BytecodeUtils.h
-        Common/include/Luau/DenseHash.h
-        Common/include/Luau/ExperimentalFlags.h
-        Common/include/Luau/Variant.h
-        Common/include/Luau/VecDeque.h
-    )
-endif()
+target_sources(Luau.Common PRIVATE
+    Common/include/Luau/Common.h
+    Common/include/Luau/Bytecode.h
+    Common/include/Luau/BytecodeUtils.h
+    Common/include/Luau/DenseHash.h
+    Common/include/Luau/ExperimentalFlags.h
+    Common/include/Luau/Variant.h
+    Common/include/Luau/VecDeque.h
+    Common/include/luacommon.h
+
+    Common/src/lflags.cpp
+)
 
 # Luau.Ast Sources
 target_sources(Luau.Ast PRIVATE
@@ -459,9 +459,10 @@ if(TARGET Luau.UnitTest)
         tests/EqSat.slice.test.cpp
         tests/EqSatSimplification.test.cpp
         tests/Error.test.cpp
+        tests/FastFlags.test.cpp
         tests/Fixture.cpp
         tests/Fixture.h
-	tests/FragmentAutocomplete.test.cpp
+        tests/FragmentAutocomplete.test.cpp
         tests/Frontend.test.cpp
         tests/Generalization.test.cpp
         tests/InsertionOrderedMap.test.cpp
diff --git a/tests/FastFlags.test.cpp b/tests/FastFlags.test.cpp
new file mode 100644
index 00000000..b72850c6
--- /dev/null
+++ b/tests/FastFlags.test.cpp
@@ -0,0 +1,32 @@
+// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
+#include "Luau/Common.h"
+
+#include "luacommon.h"
+
+#include "doctest.h"
+#include "ScopedFlags.h"
+
+LUAU_FASTFLAGVARIABLE(LuauTestingBoolFlag);
+LUAU_FASTINTVARIABLE(LuauTestingIntFlag, 123);
+
+using namespace Luau;
+
+TEST_SUITE_BEGIN("FastFlagsTest");
+
+TEST_CASE("set_fflag")
+{
+    // Set a boolean flag
+    luau_setfflag("LuauTestingBoolFlag", true);
+    CHECK_EQ(FFlag::LuauTestingBoolFlag, true);
+
+    // Set a non-existent flag
+    int result = luau_setfflag("NonExistentFlag", 1);
+    CHECK_EQ(result, 0); // Expect 0 for non-existent flag
+
+    // Bool and int flags are not mixed
+    result = luau_setfflag("LuauTestingIntFlag", 0);
+    CHECK_EQ(result, 0); // Expect 0 for non-existent (boolean) flag
+    CHECK_EQ(FInt::LuauTestingIntFlag, 123); // Should be unchanged
+}
+
+TEST_SUITE_END();