feat(patch): fix angular#828, patch socket.io client

gulpfile.js

@@ -192,6 +192,14 @@ gulp.task('build/zone-patch-user-media.min.js', ['compile-esm'], function(cb) {
   return generateScript('./lib/browser/webapis-user-media.ts', 'zone-patch-user-media.min.js', true, cb);
 });
 
+gulp.task('build/zone-patch-socket-io.js', ['compile-esm'], function(cb) {
+  return generateScript('./lib/extra/socket-io.ts', 'zone-patch-socket-io.js', false, cb);
+});
+
+gulp.task('build/zone-patch-socket-io.min.js', ['compile-esm'], function(cb) {
+  return generateScript('./lib/extra/socket-io.ts', 'zone-patch-socket-io.min.js', true, cb);
+});
+
 gulp.task('build/bluebird.js', ['compile-esm'], function(cb) {
     return generateScript('./lib/extra/bluebird.ts', 'zone-bluebird.js', false, cb);
 });
@@ -297,6 +305,8 @@ gulp.task('build', [
   'build/zone-patch-electron.min.js',
   'build/zone-patch-user-media.js',
   'build/zone-patch-user-media.min.js',
+  'build/zone-patch-socket-io.js',
+  'build/zone-patch-socket-io.min.js',
   'build/zone-mix.js',
   'build/bluebird.js',
   'build/bluebird.min.js',

lib/extra/socket-io.ts

@@ -0,0 +1,24 @@
+/**
+ * @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
+ */
+Zone.__load_patch('socketio', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
+  (Zone as any)[Zone.__symbol__('socketio')] = function patchSocketIO(io: any) {
+    // io is being mixed with Emitter.prototype, so we can patchEventTargetMethods
+    // with io.prototype
+    api.patchEventTarget(global, [io.Socket.prototype], {
+      useG: false,
+      chkDup: false,
+      rt: true,
+      diff: (task: any, delegate: any) => {
+        return task.callback === delegate;
+      }
+    });
+    io.Socket.prototype.on = io.Socket.prototype.addEventListener;
+    io.Socket.prototype.off = io.Socket.prototype.removeListener =
+        io.Socket.prototype.removeAllListeners = io.Socket.prototype.removeEventListener;
+  };
+});