xero-node: Cannot create Invoices and contacts

SDK:

• Version - 4.11.0

Describe the bug I’m trying to create Invoices and Contacts using Xero-Node library. But facing the same behaviour in both. Here I explained what I did for Contacts

To Reproduce

  const contacts = {
    contacts: [
      {
        'name': data.first_name + ' ' + data.last_name,
        'firstName': data.first_name,
        'lastName': data.last_name,
        'emailAddress': data.email,
        'addresses': [
          {
            'addressType': 'STREET',
            'addressLine1': data.address.replace('$$$$', ', '),
            'city': data.city,
            'postalCode': data.zip_code
          }
        ],
      }
    ],
  };
  console.log(contacts);
  try {
    const response = await xero.accountingApi.createContacts(tokenSet.tenant_id, contacts, summarizeErrors);
    logger.info('Invoice created', response.body || response.response.statusCode);
    return response;
  } catch (err) {
    const error = JSON.stringify(err, null, 2);
    logger.error(`Status Code: ${err} => ${error}`);
  }
}; 

Output:

// from console.log
{
  contacts: [
    {
      name: 'patient name3',
      firstName: 'patient',
      lastName: 'name3',
      emailAddress: 'name@patient.com',
      addresses: [Array]
    }
  ]
}

// error
"response": {
    "statusCode": 400,
    "body": {
      "ErrorNumber": 10,
      "Type": "ValidationException",
      "Message": "A validation exception occurred",
      "Elements": [
        {
          "ContactID": "00000000-0000-0000-0000-000000000000",
          "Name": "",
          "Addresses": [],
          "Phones": [],
          "ContactGroups": [],
          "ContactPersons": [],
          "HasValidationErrors": true,
          "ValidationErrors": [
            {
              "Message": "Contact name cannot be empty"
            }
          ]
        }
      ]
    },
    "headers": {
      "content-type": "application/json; charset=utf-8",
      "content-length": "475",
      "server": "nginx",
      "x-appminlimit-remaining": "9995",
      "x-minlimit-remaining": "58",
      "x-daylimit-remaining": "4859",
      "expires": "Sun, 21 Mar 2021 05:03:00 GMT",
      "cache-control": "max-age=0, no-cache, no-store",
      "pragma": "no-cache",
      "date": "Sun, 21 Mar 2021 05:03:00 GMT",
      "connection": "close",
      "x-client-tls-ver": "tls1.3"
    },
    "request": {
      "uri": {
        "protocol": "https:",
        "slashes": true,
        "auth": null,
        "host": "api.xero.com",
        "port": null,
        "hostname": "api.xero.com",
        "hash": null,
        "search": "?summarizeErrors=true",
        "query": "summarizeErrors=true",
        "pathname": "/api.xro/2.0/Contacts",
        "path": "/api.xro/2.0/Contacts?summarizeErrors=true",
        "href": "https://api.xero.com/api.xro/2.0/Contacts?summarizeErrors=true"
      },
      "method": "PUT",
      "headers": {
        "user-agent": "xero-node-4.11.0",
        "xero-tenant-id": <tenant-id>,
        "Authorization": "Bearer  token",
        "accept": "application/json",
        "content-type": "application/json",
        "content-length": 231
      }
    }
  },
  "body": {}
}

So I console.logged here - https://github.com/XeroAPI/xero-node/blob/master/src/gen/api/accountingApi.ts#L1314

console.log(models_1.ObjectSerializer.serialize(contacts, "Contacts"))

I got this as input data.

  Contacts: [
    {
      ContactID: undefined,
      ContactNumber: undefined,
      AccountNumber: undefined,
      ContactStatus: undefined,
      Name: 'patient name3',
      FirstName: 'patient',
      LastName: 'name3',
      EmailAddress: 'name@patient.com',
      SkypeUserName: undefined,
      ContactPersons: undefined,
      BankAccountDetails: undefined,
      TaxNumber: undefined,
      AccountsReceivableTaxType: undefined,
      AccountsPayableTaxType: undefined,
      Addresses: [Array],
      Phones: undefined,
      IsSupplier: undefined,
      IsCustomer: undefined,
      DefaultCurrency: undefined,
      XeroNetworkKey: undefined,
      SalesDefaultAccountCode: undefined,
      PurchasesDefaultAccountCode: undefined,
      SalesTrackingCategories: undefined,
      PurchasesTrackingCategories: undefined,
      TrackingCategoryName: undefined,
      TrackingCategoryOption: undefined,
      PaymentTerms: undefined,
      UpdatedDateUTC: undefined,
      ContactGroups: undefined,
      Website: undefined,
      BrandingTheme: undefined,
      BatchPayments: undefined,
      Discount: undefined,
      Balances: undefined,
      Attachments: undefined,
      HasAttachments: undefined,
      ValidationErrors: undefined,
      HasValidationErrors: undefined,
      StatusAttributeString: undefined,
      undefined: undefined
    },
    {
      ContactID: undefined,
      ContactNumber: undefined,
      AccountNumber: undefined,
      ContactStatus: undefined,
      Name: '',
      FirstName: undefined,
      LastName: undefined,
      EmailAddress: undefined,
      SkypeUserName: undefined,
      ContactPersons: undefined,
      BankAccountDetails: undefined,
      TaxNumber: undefined,
      AccountsReceivableTaxType: undefined,
      AccountsPayableTaxType: undefined,
      Addresses: undefined,
      Phones: undefined,
      IsSupplier: undefined,
      IsCustomer: undefined,
      DefaultCurrency: undefined,
      XeroNetworkKey: undefined,
      SalesDefaultAccountCode: undefined,
      PurchasesDefaultAccountCode: undefined,
      SalesTrackingCategories: undefined,
      PurchasesTrackingCategories: undefined,
      TrackingCategoryName: undefined,
      TrackingCategoryOption: undefined,
      PaymentTerms: undefined,
      UpdatedDateUTC: undefined,
      ContactGroups: undefined,
      Website: undefined,
      BrandingTheme: undefined,
      BatchPayments: undefined,
      Discount: undefined,
      Balances: undefined,
      Attachments: undefined,
      HasAttachments: undefined,
      ValidationErrors: undefined,
      HasValidationErrors: undefined,
      StatusAttributeString: undefined,
      undefined: undefined
    }
  ],
  undefined: undefined
}

So it seems like the serialization adds one empty object in the array. Am I missing anything here? Or is it a Bug?

Thanks in advance.