Currently when subscribing to the SDAM monitoring events, the initial topologyDescriptionChanged event is emitted before the driver provides the ability to subscribe to it.

MongoClient.connect(uri, (error, db) => {
  // At this point the first event has already fired - we cannot get the initial payload.
  db.topology.on('topologyDescriptionChanged', (evt) => {});
});

Would like to have some ability to get the first payload. Either via an API or by delaying the emitting of the events until they can actually be subscribed to.