build: move zone.js to angular repo (#30962)

PR Close #30962

packages/zone.js/lib/browser/event-target.ts

@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export function eventTargetPatch(_global: any, api: _ZonePrivate) {
+  if ((Zone as any)[api.symbol('patchEventTarget')]) {
+    // EventTarget is already patched.
+    return;
+  }
+  const {eventNames, zoneSymbolEventNames, TRUE_STR, FALSE_STR, ZONE_SYMBOL_PREFIX} =
+      api.getGlobalObjects() !;
+  //  predefine all __zone_symbol__ + eventName + true/false string
+  for (let i = 0; i < eventNames.length; i++) {
+    const eventName = eventNames[i];
+    const falseEventName = eventName + FALSE_STR;
+    const trueEventName = eventName + TRUE_STR;
+    const symbol = ZONE_SYMBOL_PREFIX + falseEventName;
+    const symbolCapture = ZONE_SYMBOL_PREFIX + trueEventName;
+    zoneSymbolEventNames[eventName] = {};
+    zoneSymbolEventNames[eventName][FALSE_STR] = symbol;
+    zoneSymbolEventNames[eventName][TRUE_STR] = symbolCapture;
+  }
+
+  const EVENT_TARGET = _global['EventTarget'];
+  if (!EVENT_TARGET || !EVENT_TARGET.prototype) {
+    return;
+  }
+  api.patchEventTarget(_global, [EVENT_TARGET && EVENT_TARGET.prototype]);
+
+  return true;
+}
+
+export function patchEvent(global: any, api: _ZonePrivate) {
+  api.patchEventPrototype(global, api);
+}