I am listening for new Firebase Realtime Database documents with code something like this:
firebase.database().ref(path)
.orderByChild('timestamp')
.on('child_added', snap => {
...
});
where timestamp is set on the server with firebase.database.ServerValue.TIMESTAMP. I would like to have documents always handled in timestamp order, but I am aware that documents I add locally may arrive in the above code out of order.
I can check for and fix mis-ordered arrivals but I'd prefer not to if there is some way to have this not happen. I know about this answer (and answers that link to it) but I believe that applies to an earlier API without ordering methods like orderByChild.
I believe that I should be able to get timestamp order if I always add documents using a transaction and pass false in the applyLocally argument. I am wondering if it also works to add documents from a separate Javascript context on the same client (e.g. from a Web Worker) without a transaction.
Will either or both of these approaches guarantee timestamp ordering? Is there any other way to achieve this? Among approaches that work, is one clearly superior or are there trade-offs among them?
