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

PR Close #30962

packages/zone.js/lib/node/events.ts

@@ -0,0 +1,63 @@
+/**
+ * @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
+ */
+
+import {patchEventTarget} from '../common/events';
+
+Zone.__load_patch('EventEmitter', (global: any) => {
+  // For EventEmitter
+  const EE_ADD_LISTENER = 'addListener';
+  const EE_PREPEND_LISTENER = 'prependListener';
+  const EE_REMOVE_LISTENER = 'removeListener';
+  const EE_REMOVE_ALL_LISTENER = 'removeAllListeners';
+  const EE_LISTENERS = 'listeners';
+  const EE_ON = 'on';
+
+  const compareTaskCallbackVsDelegate = function(task: any, delegate: any) {
+    // same callback, same capture, same event name, just return
+    return task.callback === delegate || task.callback.listener === delegate;
+  };
+
+  const eventNameToString = function(eventName: string|Symbol) {
+    if (typeof eventName === 'string') {
+      return eventName as string;
+    }
+    if (!eventName) {
+      return '';
+    }
+    return eventName.toString().replace('(', '_').replace(')', '_');
+  };
+
+  function patchEventEmitterMethods(obj: any) {
+    const result = patchEventTarget(global, [obj], {
+      useG: false,
+      add: EE_ADD_LISTENER,
+      rm: EE_REMOVE_LISTENER,
+      prepend: EE_PREPEND_LISTENER,
+      rmAll: EE_REMOVE_ALL_LISTENER,
+      listeners: EE_LISTENERS,
+      chkDup: false,
+      rt: true,
+      diff: compareTaskCallbackVsDelegate,
+      eventNameToString: eventNameToString
+    });
+    if (result && result[0]) {
+      obj[EE_ON] = obj[EE_ADD_LISTENER];
+    }
+  }
+
+  // EventEmitter
+  let events;
+  try {
+    events = require('events');
+  } catch (err) {
+  }
+
+  if (events && events.EventEmitter) {
+    patchEventEmitterMethods(events.EventEmitter.prototype);
+  }
+});