Getting count of contacts correct but getting null values for contacts in Ionic 4

Ionic Native
4

Solved:

import { Contacts } from '@ionic-native/contacts/ngx';

declare var navigator: any;
@Component({
  selector: 'assignment',
  templateUrl: './assignment.page.html',
  styleUrls: ['./assignment.page.scss']
})

async getContacts() {
     await document.addEventListener("deviceready", () => {
 
      navigator.contacts.find(
        [navigator.contacts.fieldType.displayName],
        gotContacts,
        errorHandler);

        function errorHandler(e) {
          console.log("errorHandler: "+e);
        }
        
        function gotContacts(deviceContacts) {
        console.log("gotContacts, number of results " + deviceContacts.length);
          for(var i=0, len = deviceContacts.length; i<len; i++) {
                console.log("Contact >>>  ", deviceContacts[i]);
           }
       }
   }
}