TypeError:无法读取未定义的属性“”CognitoUserPool“”

// 引入AWS SDK
const AWS = require('aws-sdk');

// 配置AWS区域
AWS.config.region = 'us-west-2';

// 初始化CognitoUserPool
const poolData = {
  UserPoolId: 'your_user_pool_id',
  ClientId: 'your_client_id'
};
const userPool = new AWS.CognitoIdentityServiceProvider.CognitoUserPool(poolData);

// 使用CognitoUserPool进行用户注册
const attributeList = [];
const dataEmail = {
  Name: 'email',
  Value: 'user@example.com'
};
const attributeEmail = new AWS.CognitoIdentityServiceProvider.CognitoUserAttribute(dataEmail);
attributeList.push(attributeEmail);

userPool.signUp('username', 'password', attributeList, null, function(err, result) {
  if (err) {
    console.log(err);
    return;
  }
  console.log('注册成功');
});