diff --git a/scripts/build-plugins/legacy-build.js b/scripts/build-plugins/legacy-build.js
index b503d437..be5666e8 100644
--- a/scripts/build-plugins/legacy-build.js
+++ b/scripts/build-plugins/legacy-build.js
@@ -104,7 +104,7 @@ async function buildLegacyChunk(root, chunkName, code) {
     const babelPlugin = babel({
         babelrc: false,
         filter: filterModule,
-        //exclude: 'node_modules/**',
+        extensions: [".js", ".ts"],
         babelHelpers: 'bundled',
         presets: [
             [