diff --git a/packages/browser/jest-dom.d.ts b/packages/browser/jest-dom.d.ts
index ff0a540d7186..c4316db82bed 100644
--- a/packages/browser/jest-dom.d.ts
+++ b/packages/browser/jest-dom.d.ts
@@ -260,8 +260,8 @@ declare namespace matchers {
      * @see
      * [testing-library/jest-dom#tohaveclass](https://github.com/testing-library/jest-dom#tohaveclass)
      */
-    toHaveClass(...classNames: Array<string | RegExp>): R
     toHaveClass(classNames: string, options?: {exact: boolean}): R
+    toHaveClass(...classNames: Array<string | RegExp>): R
     /**
      * @description
      * This allows you to check whether the given form element has the specified displayed value (the one the
diff --git a/packages/browser/utils.d.ts b/packages/browser/utils.d.ts
index 81fb50bf0c6d..9a78b236f43b 100644
--- a/packages/browser/utils.d.ts
+++ b/packages/browser/utils.d.ts
@@ -2,7 +2,7 @@
 // we cannot bundle it because vitest depend on the @vitest/browser and vise versa
 // fortunately, the file is quite small
 
-import { LocatorSelectors } from '@vitest/browser/context'
+import { LocatorSelectors, Locator } from '@vitest/browser/context'
 import { StringifyOptions } from 'vitest/utils'
 
 export type PrettyDOMOptions = Omit<StringifyOptions, 'maxLength'>
diff --git a/packages/vitest/package.json b/packages/vitest/package.json
index 532352e5dadf..9b66f56afd78 100644
--- a/packages/vitest/package.json
+++ b/packages/vitest/package.json
@@ -123,6 +123,7 @@
   },
   "peerDependencies": {
     "@edge-runtime/vm": "*",
+    "@types/debug": "^4.1.12",
     "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
     "@vitest/browser": "workspace:*",
     "@vitest/ui": "workspace:*",
@@ -133,6 +134,9 @@
     "@edge-runtime/vm": {
       "optional": true
     },
+    "@types/debug": {
+      "optional": true
+    },
     "@types/node": {
       "optional": true
     },
diff --git a/packages/vitest/src/utils/debugger.ts b/packages/vitest/src/utils/debugger.ts
index 473030ff57ce..2defeed44584 100644
--- a/packages/vitest/src/utils/debugger.ts
+++ b/packages/vitest/src/utils/debugger.ts
@@ -1,6 +1,7 @@
+import type { Debugger } from 'debug'
 import createDebug from 'debug'
 
-export function createDebugger(namespace: `vitest:${string}`) {
+export function createDebugger(namespace: `vitest:${string}`): Debugger | undefined {
   const debug = createDebug(namespace)
   if (debug.enabled) {
     return debug