ionic-coginito-confirmuser-function.cognito-service.ts

  confirmUser(verificationCode, userName) {
    return new Promise((resolved, reject) => {
      const userPool = new AWSCognito.CognitoUserPool(this._POOL_DATA);

      const cognitoUser = new AWSCognito.CognitoUser({
        Username: userName,
        Pool: userPool
      });

      cognitoUser.confirmRegistration(verificationCode, true, function(err, result) {
        if (err) {
          reject(err);
        } else {
          resolved(result);
        }
      });
    });
  }