Cfrgtkky

i am using geofire in my ionic to save longitude and latitude of users in a tracking app. However when i try to save and update user location i get this error;

FirebaseRef must be an instance of Firebase at new Geofire



import { AngularFireDatabase } from 

'angularfire2/database';



import * as GeoFire from "geofire";



import * as Firebase from "firebase";

Here is my constructor

 constructor(public http: HttpClient, public afs: AngularFireDatabase,

          public pickuprequest: PickuprequestProvider

  ) {

     this.dbLocationRef = this.afs.list('driversAvailable/' + this.driverId);

     this.geoFire = new GeoFire(this.dbLocationRef.$ref);

  }

My updating driver location function

 updateDriverLocation(key, latitude, longitude)

  {

    this.geoFire.set(key, [latitude, longitude])

    .then(_ => console.log('location updated'))

    .catch(err => console.log(err))

  }

What do i need to do? I did this

  this.dbLocationRef = new Firebase(this.afs.list('driversAvailable/' + this.driverId));

and i get

cannot use new with expression whose type lacks call or construct signature. 

Any help will be appreciated.