diff --git a/interop/src/cpp/SerializerBase.h b/interop/src/cpp/SerializerBase.h
index d631a0a2ad959aaf1f7ca7ae1106a5db34d856ce..e81e9f16b6b537c65d04cd3a9e128673d9d867ec 100644
--- a/interop/src/cpp/SerializerBase.h
+++ b/interop/src/cpp/SerializerBase.h
@@ -27,6 +27,7 @@
 
 #include "callback-resource.h"
 #include "interop-types.h"
+#include "koala-types.h"
 
 #ifdef __arm__
 #define KOALA_NO_UNALIGNED_ACCESS 1
@@ -89,12 +90,15 @@ public:
         data(data), dataLength(dataLength), position(0), ownData(false), resourceHolder(resourceHolder) {
     }
 
-    ~SerializerBase() {
+    virtual ~SerializerBase() {
         if (ownData) {
             free(data);
         }
     }
 
+    SerializerBase(const SerializerBase&) = delete;
+    SerializerBase& operator=(const SerializerBase&) = delete;
+
     void* release() {
         ownData = false;
         return data;
@@ -245,6 +249,16 @@ public:
         writePointer((void*)buffer.data);
         writeInt64(buffer.length);
     }
+
+    KInteropReturnBuffer toReturnBuffer() {
+        if (this->ownData) {
+            KInteropReturnBuffer buffer {this->length(), this->release(), [](KNativePointer data, KInt length) { free(data); }};
+            // TODO fix memory issues
+            return buffer;
+        } else {
+            return {this->length(), this->data, nullptr};
+        }
+    }
 };
 
 #endif // _SERIALIZER_BASE_H
\ No newline at end of file
diff --git a/interop/src/interop/InteropTypes.ts b/interop/src/interop/InteropTypes.ts
index af04a1c55af7b801c0b17a603dfb21aa82be9e84..0324145d82e21e647b6920f68bfcdb44ec489192 100644
--- a/interop/src/interop/InteropTypes.ts
+++ b/interop/src/interop/InteropTypes.ts
@@ -28,3 +28,4 @@ export type KBoolean = int32
 export type KPointer = number | bigint
 export type pointer = KPointer
 export type KNativePointer = KPointer
+export type KInteropReturnBuffer = Uint8Array
\ No newline at end of file