diff --git a/src/plugins/cjs-interop.ts b/src/plugins/cjs-interop.ts
index 56c8289f..eae475ec 100644
--- a/src/plugins/cjs-interop.ts
+++ b/src/plugins/cjs-interop.ts
@@ -18,7 +18,7 @@ export const cjsInterop = (): Plugin => {
       }
 
       return {
-        code: code + '\nmodule.exports = exports.default',
+        code: code + '\nmodule.exports = exports.default;\n',
         map: info.map,
       }
     },
diff --git a/vitest.config.ts b/vitest.config.ts
index 4ca2f9af..ed7271da 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -1,9 +1,7 @@
-import { UserConfig } from 'vitest'
+import { defineConfig } from 'vitest/config'
 
-const config: { test: UserConfig } = {
+export default defineConfig({
   test: {
     testTimeout: 50000,
   },
-}
-
-export default config
+})