[READ] Step 1: Are you in the right place?

• For issues or feature requests related to the code in this repository
  file a Github issue.
  • If this is a feature request make sure the issue title starts with "FR:".
• For general technical questions, post a question on StackOverflow
  with the firebase tag.
• For general Firebase discussion, use the firebase-talk
  google group.
• For help troubleshooting your application that does not fall under one
  of the above categories, reach out to the personalized
  Firebase support channel.

[REQUIRED] Step 2: Describe your environment

• Operating System version: MacOS 10.14.5
• Firebase SDK version: 7.2.1
• Library version: firebase-tools v'7.2.1' & firebase-admin v'8.3.0' & firebase-functions v'3.2.0'
• Firebase Product: admin & firestore (auth, database, storage, etc)

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

• I was used firebase-tools v'7.0.0' & firebase-admin v'7.0.0' & firebase-functions v'2.3.0', then can use method 'getCollections' of DocumentReference.

• But I was upgrade version firebase-tools v'7.2.1' & firebase-admin v'8.3.0' & firebase-functions v'3.2.0', then I can't use this method and occur this error.

Did you deprecated this method or not? I still see The documentation at here for this method 'https://firebase.google.com/docs/firestore/query-data/get-data#list_subcollections_of_a_document'

Relevant Code:

await documentRef.getCollections()