diff --git a/CMakeLists.txt b/CMakeLists.txt
index e9c5163..75c4d1e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,6 @@ project(unflutter)
 
 set(CMAKE_CXX_STANDARD 20)
 
-add_executable(unflutter main.cpp dart/Reader.cpp dart/Reader.h dart/Snapshot.cpp dart/Snapshot.h dart/Leb128Int.cpp dart/Leb128Int.h)
+add_executable(unflutter main.cpp dart/Reader.cpp dart/Reader.h dart/Snapshot.cpp dart/Snapshot.h dart/Leb128Int.cpp dart/Leb128Int.h dart/ClassId.h)
 
 target_include_directories(unflutter PRIVATE ${CMAKE_SOURCE_DIR}/ThirdParty)
\ No newline at end of file
diff --git a/dart/ClassId.h b/dart/ClassId.h
new file mode 100644
index 0000000..deb2113
--- /dev/null
+++ b/dart/ClassId.h
@@ -0,0 +1,92 @@
+//
+// Created by Selim Mustafaev on 29.11.2022.
+//
+
+#ifndef UNFLUTTER_CLASSID_H
+#define UNFLUTTER_CLASSID_H
+
+namespace Dart {
+
+    enum class ClassId {
+        Illegal = 0,
+        NativePointer = 1,
+        FreeListElement = 2,
+        ForwardingCorpse = 3,
+        Object = 4,
+        Class = 5,
+        PatchClass = 6,
+        Function = 7,
+        TypeParameters = 8,
+        ClosureData = 9,
+        FfiTrampolineData = 10,
+        Field = 11,
+        Script = 12,
+        Library = 13,
+        Namespace = 14,
+        KernelProgramInfo = 15,
+        WeakSerializationReference = 16,
+        Code = 17,
+        Instructions = 18,
+        InstructionsSection = 19,
+        InstructionsTable = 20,
+        ObjectPool = 21,
+        PcDescriptors = 22,
+        CodeSourceMap = 23,
+        CompressedStackMaps = 24,
+        LocalVarDescriptors = 25,
+        ExceptionHandlers = 26,
+        Context = 27,
+        ContextScope = 28,
+        Sentinel = 29,
+        SingleTargetCache = 30,
+        UnlinkedCall = 31,
+        MonomorphicSmiableCall = 32,
+        CallSiteData = 33,
+        ICData = 34,
+        MegamorphicCache = 35,
+        SubtypeTestCache = 36,
+        LoadingUnit = 37,
+        Error = 38,
+        ApiError = 39,
+        LanguageError = 40,
+        UnhandledException = 41,
+        UnwindError = 42,
+        Instance
+        LibraryPrefix
+        TypeArguments
+        AbstractType
+        Type
+        FunctionType
+        TypeRef
+        TypeParameter
+        Closure
+        Number
+        Integer
+        Smi
+        Mint
+        Double
+        Bool
+        Float32x4
+        Int32x4
+        Float64x2
+        TypedDataBase
+        TypedData
+        ExternalTypedData
+        TypedDataView
+        Pointer
+        DynamicLibrary
+        Capability
+        ReceivePort
+        SendPort
+        StackTrace
+        RegExp
+        WeakProperty
+        MirrorReference
+        FutureOr
+        UserTag
+        TransferableTypedData
+    };
+
+}
+
+#endif //UNFLUTTER_CLASSID_H