code: function apply(api, _global) {
      var WS = _global.WebSocket;
      // On Safari window.EventTarget doesn't exist so need to patch WS add/removeEventListener
      // On older Chrome, no need since EventTarget was already patched
      if (!_global.EventTarget) {
          patchEventTarget(api, _global, [WS.prototype]);
      }
      _global.WebSocket = function (a, b) {
          var socket = arguments.length > 1 ? new WS(a, b) : new WS(a);
          var proxySocket;
          var proxySocketProto;
          // Safari 7.0 has non-configurable own 'onmessage' and friends properties on the socket instance
          var onmessageDesc = Object.getOwnPropertyDescriptor(socket, 'onmessage');
          if (onmessageDesc && onmessageDesc.configurable === false) {
              proxySocket = Object.create(socket);
              // socket have own property descriptor 'onopen', 'onmessage', 'onclose', 'onerror'
              // but proxySocket not, so we will keep socket as prototype and pass it to
              // patchOnProperties method
              proxySocketProto = socket;
              ['addEventListener', 'removeEventListener', 'send', 'close'].forEach(function (propName) {
                  proxySocket[propName] = function () {
                      return socket[propName].apply(socket, arguments);
                  };
              });
          }
          else {
              // we can patch the real socket
              proxySocket = socket;
          }
          patchOnProperties(proxySocket, ['close', 'error', 'message', 'open'], proxySocketProto);
          return proxySocket;
      };
      for (var prop in WS) {
          _global['WebSocket'][prop] = WS[prop];
      }
  }
docs: @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
   we have to patch the instance since the proto is non-configurable