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I am trying to configure user login for my Angular 7 application, and have constructed most of the cognitoUser.authenticateUser() method, but in the onSuccess() method, I cannot refresh the AWS config credentials because I receive the following error at AWS.config.credentials.refresh():

"Property 'refresh' does not exist on type 'Credentials | CredentialsOptions'.
Property 'refresh' does not exist on type 'CredentialsOptions'."

auth.service.ts:

import Injectable from '@angular/core';
import Router from '@angular/router';

import * as AWS from 'AWS-sdk';
import CognitoIdentityCredentials from 'AWS-sdk';
import * as AmazonCognitoIdentity from 'amazon-cognito-identity-js';
import credentials from '../../../../server/credentials.json';

@Injectable(
 providedIn: 'root'
)

export class AuthService 

 user: AmazonCognitoIdentity.CognitoUser;

 userPool;
 userData;

 isAuthenticated: boolean;

 constructor(private router: Router) 
 const poolData = 
 UserPoolId: '*****',
 ClientId: credentials.appClientId
 

 this.userPool = new AmazonCognitoIdentity.CognitoUserPool(poolData);

 if (this.user) 
 this.isAuthenticated = true;
 else 
 this.isAuthenticated = false;
 
 

 signIn(email, password) 
 const authDetails = new AmazonCognitoIdentity.AuthenticationDetails(
 Username: email,
 Password: password
 )

 const userData = 
 Username: email,
 Pool: this.userPool
 

 const cognitoUser = new AmazonCognitoIdentity.CognitoUser(userData);

 cognitoUser.authenticateUser(authDetails, 
 onSuccess: function(res) 
 const accessToken = res.getAccessToken().getJwtToken();

 AWS.config.credentials = new AWS.CognitoIdentityCredentials(
 IdentityPoolId: this.userPool.UserPoolId,
 Logins: 
 'cognito-idp.*****.amazonaws.com/*****': res.getIdToken().getJwtToken()
 
 )

 AWS.config.credentials.refresh(err => 
 // ISSUE HERE
 )
 ,
 onFailure: function(err) 

 
 
 

AWS.config.credentials.refresh(err => 
 // ISSUE HERE
)

replace the above code with this

( < AWS.CognitoIdentityCredentials > AWS.config.credentials).refresh((error) => 

);

This is called casting of variable