fix: don't bind global classes (#1345)

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

@@ -26,6 +26,10 @@ export function getWindowKeys(global: any, win: any) {
   return keys
 }
 
+function isClassLikeName(name: string) {
+  return name[0] === name[0].toUpperCase()
+}
+
 interface PopulateOptions {
   bindFunctions?: boolean
 }
@@ -40,13 +44,21 @@ export function populateGlobal(global: any, win: any, options: PopulateOptions =
 
   const overrideObject = new Map<string | symbol, any>()
   for (const key of keys) {
-    const bindedFunction = bindFunctions && typeof win[key] === 'function' && win[key].bind(win)
+    // we bind functions such as addEventListener and others
+    // because they rely on `this` in happy-dom, and in jsdom it
+    // has a priority for getting implementaion from symbols
+    // (global doesn't have these symbols, but window - does)
+    const boundFunction = bindFunctions
+      && typeof win[key] === 'function'
+      && !isClassLikeName(key)
+      && win[key].bind(win)
+
     Object.defineProperty(global, key, {
       get() {
         if (overrideObject.has(key))
           return overrideObject.get(key)
-        if (bindedFunction)
-          return bindedFunction
+        if (boundFunction)
+          return boundFunction
         return win[key]
       },
       set(v) {

test/core/test/dom.test.ts

@@ -126,3 +126,9 @@ it('globals are the same', () => {
   expect(window.globalThis.Blob).toBe(globalThis.Blob)
   expect(Blob).toBe(globalThis.Blob)
 })
+
+it('can extend global class', () => {
+  class SuperBlob extends Blob {}
+
+  expect(SuperBlob).toBeDefined()
+})