diff --git a/src/js_native_api.h b/src/js_native_api.h
index e804d1d45d236519d248e3d40fa0a6c2a6d378ec..dd962e4159bb44baa31b4698aa0b898dac0b5021 100644
--- a/src/js_native_api.h
+++ b/src/js_native_api.h
@@ -292,6 +292,13 @@ NAPI_EXTERN napi_status napi_wrap(napi_env env,
                                   napi_finalize finalize_cb,
                                   void* finalize_hint,
                                   napi_ref* result);
+NAPI_EXTERN napi_status napi_wrap_with_size(napi_env env,
+                                  napi_value js_object,
+                                  void* native_object,
+                                  napi_finalize finalize_cb,
+                                  void* finalize_hint,
+                                  napi_ref* result,
+                                  size_t native_binding_size);
 NAPI_EXTERN napi_status napi_unwrap(napi_env env,
                                     napi_value js_object,
                                     void** result);
@@ -303,6 +310,13 @@ NAPI_EXTERN napi_status napi_create_external(napi_env env,
                                              napi_finalize finalize_cb,
                                              void* finalize_hint,
                                              napi_value* result);
+NAPI_EXTERN napi_status napi_create_external_with_size(napi_env env,
+                                                       void* data,
+                                                       napi_finalize finalize_cb,
+                                                       void* finalize_hint,
+                                                       napi_value* result,
+                                                       size_t native_binding_size);
+
 NAPI_EXTERN napi_status napi_get_value_external(napi_env env,
                                                 napi_value value,
                                                 void** result);
diff --git a/src/js_native_api_v8.cc b/src/js_native_api_v8.cc
index 12528799efa43ac5b32e553437b148c638c57ee5..7b86ebdb0ffc37cedbb3840711d4ca3fa4ef4288 100644
--- a/src/js_native_api_v8.cc
+++ b/src/js_native_api_v8.cc
@@ -2325,6 +2325,21 @@ napi_status napi_wrap(napi_env env,
                                            result);
 }
 
+napi_status napi_wrap_with_size(napi_env env,
+                                napi_value js_object,
+                                void* native_object,
+                                napi_finalize finalize_cb,
+                                void* finalize_hint,
+                                napi_ref* result,
+                                size_t native_binding_size) {
+  return v8impl::Wrap<v8impl::retrievable>(env,
+                                           js_object,
+                                           native_object,
+                                           finalize_cb,
+                                           finalize_hint,
+                                           result,
+                                           native_binding_size);
+}
 napi_status napi_unwrap(napi_env env, napi_value obj, void** result) {
   return v8impl::Unwrap(env, obj, result, v8impl::KeepWrap);
 }
@@ -2360,6 +2375,34 @@ napi_status napi_create_external(napi_env env,
   return napi_clear_last_error(env);
 }
 
+napi_status napi_create_external_with_size(napi_env env,
+                                           void* data,
+                                           napi_finalize finalize_cb,
+                                           void* finalize_hint,
+                                           napi_value* result
+                                           size_t native_binding_size) {
+  NAPI_PREAMBLE(env);
+  CHECK_ARG(env, result);
+
+  v8::Isolate* isolate = env->isolate;
+
+  v8::Local<v8::Value> external_value = v8::External::New(isolate, data, native_binding_size);
+
+  // The Reference object will delete itself after invoking the finalizer
+  // callback.
+  v8impl::Reference::New(env,
+      external_value,
+      0,
+      true,
+      finalize_cb,
+      data,
+      finalize_hint);
+
+  *result = v8impl::JsValueFromV8LocalValue(external_value);
+
+  return napi_clear_last_error(env);
+}
+
 NAPI_EXTERN napi_status napi_type_tag_object(napi_env env,
                                              napi_value object,
                                              const napi_type_tag* type_tag) {