diff --git a/packages/integrate-module/src/compiled.d.ts b/packages/integrate-module/src/compiled.d.ts
new file mode 100644
index 000000000..d9913f520
--- /dev/null
+++ b/packages/integrate-module/src/compiled.d.ts
@@ -0,0 +1,3 @@
+export declare class CompiledClass {
+  name: string
+}
diff --git a/packages/integrate-module/src/compiled.js b/packages/integrate-module/src/compiled.js
new file mode 100644
index 000000000..3caad40f7
--- /dev/null
+++ b/packages/integrate-module/src/compiled.js
@@ -0,0 +1,5 @@
+export class CompiledClass {
+  constructor() {
+    this.name = 'CompiledClass'
+  }
+}
diff --git a/packages/integrate-module/src/index.ts b/packages/integrate-module/src/index.ts
index e21665746..1df3f6f77 100644
--- a/packages/integrate-module/src/index.ts
+++ b/packages/integrate-module/src/index.ts
@@ -2,9 +2,9 @@
 import assert from 'node:assert'
 import test from 'node:test'
 
+import { bar as subBar } from '@subdirectory/bar.mjs'
 import { supportedExtensions } from 'file-type'
 
-import { bar as subBar } from '@subdirectory/bar.mjs'
 import { CompiledClass } from './compiled.js'
 import { foo } from './foo.mjs'
 import { bar } from './subdirectory/bar.mjs'
@@ -30,3 +30,8 @@ await test('resolve nested entry point', () => {
 await test('resolve paths', () => {
   assert.equal(subBar(), 'bar')
 })
+
+await test('compiled js file with .d.ts', () => {
+  const instance = new CompiledClass()
+  assert.equal(instance.name, 'CompiledClass')
+})