diff --git a/cli/src/generate/templates/js-binding.cc b/cli/src/generate/templates/js-binding.cc
index 8daca6f5..5b167cc8 100644
--- a/cli/src/generate/templates/js-binding.cc
+++ b/cli/src/generate/templates/js-binding.cc
@@ -4,9 +4,16 @@ typedef struct TSLanguage TSLanguage;
 
 extern "C" TSLanguage *tree_sitter_PARSER_NAME();
 
+// "tree-sitter", "language" hashed with BLAKE2
+const napi_type_tag LANGUAGE_TYPE_TAG = {
+  0x8AF2E5212AD58ABF, 0xD5006CAD83ABBA16
+};
+
 Napi::Object Init(Napi::Env env, Napi::Object exports) {
     exports["name"] = Napi::String::New(env, "PARSER_NAME");
-    exports["language"] = Napi::External<TSLanguage>::New(env, tree_sitter_PARSER_NAME());
+    auto language = Napi::External<TSLanguage>::New(env, tree_sitter_PARSER_NAME());
+    language.TypeTag(&LANGUAGE_TYPE_TAG);
+    exports["language"] = language;
     return exports;
 }