Firestore - batch.add is not a function

Question

The documentation for Firestore batch writes lists only set(), update() and delete() as permitted operations.

Is there no way

Answer 1

In my case, using AngularFire2, I had to use the batch.set() method, passing as first parameter the document reference with an ID previously created, and the reference attribute:

import { AngularFirestore } from '@angular/fire/firestore';
...
private afs: AngularFirestore
...
batch.set(
    this.afs.collection('estados').doc(this.afs.createId()).ref,
    er.getData()
  );