diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c4889dab..b591dd2c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -49,3 +49,4 @@ jobs:
           disable_search: true
           files: coverage/lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}
+      - run: yarn run build
diff --git a/package.json b/package.json
index 99a82e25..93d7a258 100644
--- a/package.json
+++ b/package.json
@@ -11,10 +11,7 @@
     "url": "https://github.com/ikatyang"
   },
   "exports": {
-    ".": {
-      "types": "./dist/index.d.mts",
-      "default": "./dist/index.mjs"
-    }
+    ".": "./dist/index.js"
   },
   "license": "MIT",
   "scripts": {
diff --git a/tsconfig.json b/tsconfig.json
index 513d74dc..f7ad4e78 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -11,5 +11,10 @@
     "noEmit": true,
     "allowImportingTsExtensions": true
   },
-  "include": ["src/**/*.ts", "tests/**/*.ts", "vitest.config.ts"]
+  "include": [
+    "src/**/*.ts",
+    "tests/**/*.ts",
+    "vitest.config.ts",
+    "tsdown.config.ts"
+  ]
 }
diff --git a/tsdown.config.ts b/tsdown.config.ts
new file mode 100644
index 00000000..e771f578
--- /dev/null
+++ b/tsdown.config.ts
@@ -0,0 +1,6 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig({
+  external: ['@babel/types'],
+  fixedExtension: false,
+});