diff --git a/packages/vitest-config/src-tests-folder-config.ts b/packages/vitest-config/src-tests-folder-config.ts
index cd5dc75..ea38514 100644
--- a/packages/vitest-config/src-tests-folder-config.ts
+++ b/packages/vitest-config/src-tests-folder-config.ts
@@ -1,4 +1,6 @@
-export const srcTestFolderConfig = function (baseUrl: string) {
+import { ViteUserConfig } from 'vitest/config'
+
+export const srcTestFolderConfig = function (baseUrl: string): ViteUserConfig {
 	return {
 		test: {
 			alias: {