code: function getClosureSafeProperty(objWithPropertyToExtract, target) {
      for (var key in objWithPropertyToExtract) {
          if (objWithPropertyToExtract[key] === target) {
              return key;
          }
      }
      throw Error('Could not find renamed property on target object.');
  }
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