creating cognito user pool, app client, and user

myStack.ts

const userPool = new cognito.UserPool(this, 'medium-userpool', {
  userPoolName: 'medium-userpool',
});

userPool.addClient('medium-client-1', {
  oAuth: {
    flows: {
      authorizationCodeGrant: true,
    },
    callbackUrls: ['https://www.google.com.au/'],
  },
  userPoolClientName: 'medium-client-1',
  generateSecret: false,
  authFlows: {
    userPassword: true,
    userSrp: true,
  },
  enableTokenRevocation: true,
  preventUserExistenceErrors: true,
  idTokenValidity: Duration.hours(1),
  accessTokenValidity: Duration.hours(1),
  refreshTokenValidity: Duration.days(30),
});

userPool.addDomain('CognitoDomain', {
  cognitoDomain: {
    domainPrefix: 'my-medium-example',
  },
});

const cognitoUserPoolsAuthorizer = new apigateway.CognitoUserPoolsAuthorizer(this, 'medium-cognito-authoriser', {
  cognitoUserPools: [userPool],
});

const authorizer = {
  authorizer: cognitoUserPoolsAuthorizer,
  authorizationType: apigateway.AuthorizationType.COGNITO,
};

new cognito.CfnUserPoolUser(this, 'medium-admin-user', {
  userPoolId: userPool.userPoolId,
  forceAliasCreation: false,
  userAttributes: [
    {
      name: 'email',
      value: 'medium@example.com',
    },
  ],
  username: 'medium-admin-user',
});