code: function GetUser(amplify) {
    return amplify.Auth.currentAuthenticatedUser().then((user) => {
      if (!user) {
        return null;
      }
      return user;
    }).catch(e => new Error(e));
  }
docs: /*
  Copyright 2017-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
  
  Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with
  the License. A copy of the License is located at
  
  http://aws.amazon.com/apache2.0/
  
  or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
  CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
  and limitations under the License.