diff --git a/napi/transform/test/id.test.mjs b/napi/transform/test/id.test.ts
similarity index 96%
rename from napi/transform/test/id.test.mjs
rename to napi/transform/test/id.test.ts
index 5ac5ef1b4c83a..d378d5e79a116 100644
--- a/napi/transform/test/id.test.mjs
+++ b/napi/transform/test/id.test.ts
@@ -1,6 +1,6 @@
 import { assert, describe, it } from 'vitest';
 
-import oxc from './index.js';
+import oxc from './index';
 
 describe('isolated declaration', () => {
   const code = `
diff --git a/napi/transform/test/transform.test.mjs b/napi/transform/test/transform.test.ts
similarity index 98%
rename from napi/transform/test/transform.test.mjs
rename to napi/transform/test/transform.test.ts
index 4230849e3884a..1782e74ff43be 100644
--- a/napi/transform/test/transform.test.mjs
+++ b/napi/transform/test/transform.test.ts
@@ -1,6 +1,6 @@
 import { assert, describe, it } from 'vitest';
 
-import oxc from './index.js';
+import oxc from './index';
 
 describe('transform', () => {
   const code = 'export class A<T> {}';