使用AWS Cognito通过无服务器框架创建新用户

Question

我是AWS的新手。我正在尝试使用Serverless和Cognito注册新用户。我正在使用Apollo / GraphQL（并且从前端看到了我想要的所有信息），但是我已对所有内容进行了硬编码以消除任何请求错误。在我的一生中，我无法弄清楚为什么无法让新用户注册：

const { ApolloServer, gql } = require('apollo-server-lambda');
const AmazonCognitoIdentity = require('amazon-cognito-identity-js');
global.fetch = require('node-fetch');

const USER_POOL_ID = 'us-east-1_XXXXXXXXX';
const USER_POOL_APP_ID = 'XXXXXXXXXXXXXXXXXXXXXXXXXX';

const POOL_PARAMS = {
  UserPoolId: USER_POOL_ID,
  ClientId: USER_POOL_APP_ID
}

const UserPool = new AmazonCognitoIdentity.CognitoUserPool(POOL_PARAMS);


const typeDefs = gql`
  type UserSignup {
    email: String!
    name: String!
    password: String!
  }

  type Mutation {
    signup(email: String!, name: String!, password: String!): UserSignup
  }
`;

const resolvers = {
  Mutation: {
    signup: (parentVal, { email, name, password }) => {

      console.log('I can alway see this log');

      const attributeList = [];
      const attributeEmail = new AmazonCognitoIdentity.CognitoUserAttribute({ Name: 'email', Value: 'email@email.com' });
      const attributeName = new AmazonCognitoIdentity.CognitoUserAttribute({ Name: 'name', Value: 'mike' });
      attributeList.push(attributeEmail);
      attributeList.push(attributeName);

      console.log('I can see these too ', attributeList);
      console.log('This will return a function ', UserPool.signUp);

      UserPool.signUp('email@email.com', 'P@ssw0rd!', attributeList, null, function(poolErr, poolResult) {
        console.log('I never see a console.log from in here');
        if (poolErr) {
          console.log('ERROR: ', poolErr);
        }
        console.log('RESULT: ', poolResult);
        return { email, name };
      })
    }
  }
};

const server = new ApolloServer({ typeDefs, resolvers });

exports.graphql = server.createHandler();

运行sls logs时，我再也看不到UserPool.signUp函数内部有任何返回值。它总是在线上之前。以下是我从this SO post获得的serverless.yml文件的信息。

service: AppName

provider:
  name: aws
  runtime: nodejs8.10

functions:
  graphql:
    handler: handler.graphql
    events:
      - http:
          path: graphql
          method: post
          cors: true
          integration: lambda
          authorizer:
            name: authorizer
            arn: arn:aws:cognito-idp:us-east-1:XXXXXXXXXXXX:userpool/us-east-1_XXXXXXXXX
            claims:
              - email

我能够通过curl请求创建一个新用户，所以我知道我已经在AWS端设置了它。已经过了几天晚上，我要放弃Cognito并使用JWT。