Get ordered children in order in clientside with 'once()'

firebase-order-by-child.js

// WORKS
// firebase API - with once('value')
firebase().database().ref('/dinosaurs').orderByChild('height').once('value', function (snapshot) {
  snapshot.forEach(function(child) {
      console.log(child.val())
  });
});
// firebase API - with once('child_added')
firebase().database().ref('/dinosaurs').orderByChild('height').once('child_added', function (snapshot) {
   console.log(snapshot.val());
})
// angularfire2's 4.0.0-rc.1 API
db.list('/dinosaurs', {
  query: {
    orderByChild: 'height'
  }
})
.subscribe((snapshot) => {
  console.log(snapshot);
})

// DOESN'T WORK
firebase().database().ref('/dinosaurs').orderByChild('height').once('value', function (snapshot) {
  console.log(snapshot.val());
});