update guard

Author: Gabriel Schulhof

napi-inl.h

@@ -322,7 +322,7 @@ inline Value Env::RunScript(String script) {
   return Value(_env, result);
 }
 
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION > 5
 template <typename T, Env::Finalizer<T> fini = Env::DefaultFini<T>>
 inline void Env::SetInstanceData(T* data) {
   napi_status status =
@@ -345,8 +345,7 @@ inline T* Env::GetInstanceData() {
 template <typename T> void Env::DefaultFini(T* data) {
   delete data;
 }
-
-#endif  // NAPI_EXPERIMENTAL
+#endif  // NAPI_VERSION > 5
 
 ////////////////////////////////////////////////////////////////////////////////
 // Value class

napi.h

@@ -172,10 +172,10 @@ namespace Napi {
   ///
   /// In the V8 JavaScript engine, a N-API environment approximately corresponds to an Isolate.
   class Env {
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION > 5
   private:
     template <typename T> static void DefaultFini(T* data);
-#endif
+#endif  // NAPI_VERSION > 5
   public:
     Env(napi_env env);
 
@@ -192,12 +192,12 @@ namespace Napi {
     Value RunScript(const std::string& utf8script);
     Value RunScript(String script);
 
-#ifdef NAPI_EXPERIMENTAL
+#if NAPI_VERSION > 5
     template <typename T> using Finalizer = void (*)(T*);
     template <typename T, Finalizer<T> fini = Env::DefaultFini<T>>
     void SetInstanceData(T* data);
     template <typename T> T* GetInstanceData();
-#endif
+#endif  // NAPI_VERSION > 5
 
   private:
     napi_env _env;