fix: global Event should be equal to env Event (#793)

packages/vitest/src/integrations/env/happy-dom.ts

@@ -1,15 +1,14 @@
 import { importModule } from 'local-pkg'
 import type { Environment } from '../../types'
-import { KEYS } from './jsdom-keys'
+import { getWindowKeys } from './utils'
 
 export default <Environment>({
   name: 'happy-dom',
   async setup(global) {
     const { Window } = await importModule('happy-dom') as typeof import('happy-dom')
     const win: any = new Window()
 
-    const keys = new Set(KEYS.concat(Object.getOwnPropertyNames(win))
-      .filter(k => !k.startsWith('_') && !(k in global)))
+    const keys = getWindowKeys(global, win)
 
     const overrideObject = new Map<string, any>()
     for (const key of keys) {

packages/vitest/src/integrations/env/jsdom.ts

@@ -1,6 +1,6 @@
 import { importModule } from 'local-pkg'
 import type { Environment, JSDOMOptions } from '../../types'
-import { KEYS } from './jsdom-keys'
+import { getWindowKeys } from './utils'
 
 export default <Environment>({
   name: 'jsdom',
@@ -40,8 +40,7 @@ export default <Environment>({
       },
     )
 
-    const keys = new Set(KEYS.concat(Object.getOwnPropertyNames(dom.window))
-      .filter(k => !k.startsWith('_') && !(k in global)))
+    const keys = getWindowKeys(global, dom.window)
 
     const overrideObject = new Map<string, any>()
     for (const key of keys) {

packages/vitest/src/integrations/env/utils.ts

@@ -0,0 +1,18 @@
+import { KEYS } from './jsdom-keys'
+
+const allowRewrite = new Set([
+  'Event',
+])
+
+export function getWindowKeys(global: any, win: any) {
+  const keys = new Set(KEYS.concat(Object.getOwnPropertyNames(win))
+    .filter((k) => {
+      if (k.startsWith('_')) return false
+      if (k in global)
+        return allowRewrite.has(k)
+
+      return true
+    }))
+
+  return keys
+}