diff --git a/packages/vitest/src/index.ts b/packages/vitest/src/index.ts
index 71c19acb9d94..83d859d38ee2 100644
--- a/packages/vitest/src/index.ts
+++ b/packages/vitest/src/index.ts
@@ -26,6 +26,10 @@ declare module 'vite' {
   }
 }
 
+export function defineConfig(config: { test?: VitestInlineConfig }) {
+  return config
+}
+
 interface AsymmetricMatchersContaining {
   stringContaining(expected: string): any
   objectContaining(expected: any): any