Firebase ANE - SubCollection of Document

[applauzmedia]

How can I find the subcollection within a document.

I can easily find collection/document but don't see a way to read my structure of collection/document/collection

I thought it would work like this.. but it errors out.

var document:DocumentReference = Firestore.collection("collectionName").document("docName").collection("collectionName");

Does anyone know a way to do this?