From f3d960a7786f98aab779da11c9762be9796153a1 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Mon, 2 Mar 2026 10:23:35 +0900
Subject: [PATCH 1/2] fix: fix `URL.name` on jsdom

---
 packages/vitest/src/integrations/env/jsdom.ts | 10 ++++++++--
 test/core/test/environments/jsdom.spec.ts     |  5 +++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/packages/vitest/src/integrations/env/jsdom.ts b/packages/vitest/src/integrations/env/jsdom.ts
index c585ea4237a9..31e3c155553b 100644
--- a/packages/vitest/src/integrations/env/jsdom.ts
+++ b/packages/vitest/src/integrations/env/jsdom.ts
@@ -232,7 +232,7 @@ export default <Environment>{
 }
 
 function createCompatRequest(utils: CompatUtils) {
-  return class Request extends NodeRequest_ {
+  const CompatRequest = class Request extends NodeRequest_ {
     constructor(...args: [input: RequestInfo, init?: RequestInit]) {
       const [input, init] = args
       if (init?.body != null) {
@@ -254,10 +254,12 @@ function createCompatRequest(utils: CompatUtils) {
       return instance instanceof NodeRequest_
     }
   }
+  Object.defineProperty(CompatRequest, 'name', { value: 'Request' })
+  return CompatRequest
 }
 
 function createJSDOMCompatURL(utils: CompatUtils): typeof URL {
-  return class URL extends NodeURL {
+  const CompatURL = class URL extends NodeURL {
     static createObjectURL(blob: any): string {
       if (blob instanceof utils.window.Blob) {
         const compatBlob = utils.makeCompatBlob(blob)
@@ -270,6 +272,10 @@ function createJSDOMCompatURL(utils: CompatUtils): typeof URL {
       return instance instanceof NodeURL
     }
   } as typeof URL
+  // bundlers may rename the class expression to avoid conflicts (e.g. URL$1)
+  // https://github.com/vitest-dev/vitest/issues/9761
+  Object.defineProperty(CompatURL, 'name', { value: 'URL' })
+  return CompatURL
 }
 
 interface CompatUtils {
diff --git a/test/core/test/environments/jsdom.spec.ts b/test/core/test/environments/jsdom.spec.ts
index 5caed58f81a6..2dee767ce169 100644
--- a/test/core/test/environments/jsdom.spec.ts
+++ b/test/core/test/environments/jsdom.spec.ts
@@ -319,6 +319,11 @@ test('URL.createObjectUrl works properly', () => {
   }).not.toThrow()
 })
 
+test('compat classes preserve their .name property', () => {
+  expect(URL.name).toBe('URL')
+  expect(Request.name).toBe('Request')
+})
+
 test('jsdom global is exposed', () => {
   // @ts-expect-error -- jsdom is not exposed in our types because we use a single tsconfig for all
   const dom = jsdom

From a628859350b51a0f3c16eb942960eb282b666685 Mon Sep 17 00:00:00 2001
From: Hiroshi Ogawa <hi.ogawa.zz@gmail.com>
Date: Mon, 2 Mar 2026 10:38:50 +0900
Subject: [PATCH 2/2] refactor: this works actually

---
 packages/vitest/src/integrations/env/jsdom.ts | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/packages/vitest/src/integrations/env/jsdom.ts b/packages/vitest/src/integrations/env/jsdom.ts
index 31e3c155553b..dcf3dbe9253d 100644
--- a/packages/vitest/src/integrations/env/jsdom.ts
+++ b/packages/vitest/src/integrations/env/jsdom.ts
@@ -232,7 +232,7 @@ export default <Environment>{
 }
 
 function createCompatRequest(utils: CompatUtils) {
-  const CompatRequest = class Request extends NodeRequest_ {
+  class Request extends NodeRequest_ {
     constructor(...args: [input: RequestInfo, init?: RequestInit]) {
       const [input, init] = args
       if (init?.body != null) {
@@ -254,12 +254,11 @@ function createCompatRequest(utils: CompatUtils) {
       return instance instanceof NodeRequest_
     }
   }
-  Object.defineProperty(CompatRequest, 'name', { value: 'Request' })
-  return CompatRequest
+  return Request
 }
 
 function createJSDOMCompatURL(utils: CompatUtils): typeof URL {
-  const CompatURL = class URL extends NodeURL {
+  class URL extends NodeURL {
     static createObjectURL(blob: any): string {
       if (blob instanceof utils.window.Blob) {
         const compatBlob = utils.makeCompatBlob(blob)
@@ -271,11 +270,8 @@ function createJSDOMCompatURL(utils: CompatUtils): typeof URL {
     static [Symbol.hasInstance](instance: unknown): boolean {
       return instance instanceof NodeURL
     }
-  } as typeof URL
-  // bundlers may rename the class expression to avoid conflicts (e.g. URL$1)
-  // https://github.com/vitest-dev/vitest/issues/9761
-  Object.defineProperty(CompatURL, 'name', { value: 'URL' })
-  return CompatURL
+  }
+  return URL
 }
 
 interface CompatUtils {