writeResult is undefined when trying to replicate example

[wzard]

I am using firestore in react.
I am trying to replicate the example documentation.
I am able to set the doc with the value provided but function is returning undefined on being fulfilled.

The below code which is taken from documentation here is returning writeResult is undefined.

I am able to successfully write the doc though.
Can anyone check.

let documentRef = firestore.doc('col/doc');

documentRef.set({foo: 'bar'}).then(writeResult => {
  console.log(`Document written at: ${writeResult.writeTime}`);
});

[google-oss-bot]

Hey there! I couldn't figure out what this issue is about, so I've labeled it for a human to triage. Hang tight.

[google-oss-bot]

Hmmm this issue does not seem to follow the issue template. Make sure you provide all the required information.

[wzard]

In the set method of Document reference here it is written that the promise returns a non-null void.

Then I presume, writeResult is not forwarded after set and the docs I have mentioned in the issue are wrong?

[jshcrowthe]

It seems like there may be something going on here, but we need more information to really diagnose the problem. Can you put together a repro for us to help triage?

[mikelehen]

This is expected. set() returns a Promise. See https://firebase.google.com/docs/reference/js/firebase.firestore.DocumentReference#set

You are perhaps looking at the gcloud server SDK (https://github.com/googleapis/nodejs-firestore) which has a similar but not quite identical API. Sorry for the confusion.