Does the Firebase Firestore Function onWrite support multiple params?

Question

The #onWrite Firebase Firestore function - I understand from the docs and several examples across the web that Firestore functions support ONE variable/param in the path, eg:

functions.firestore
  .document('tests/{firstId}')
  .onWrite((change, context) => { ... })

... but I can't find docs or examples if it supports multiple params in the path, eg:

functions.firestore
  .document('tests/{firstId}/nested/{secondId}') //- note the secondId
  .onWrite((change, context) => { ... })

In my tests running on local Firestore emulator, this function doesn't fire.

Can anyone confirm if multiple params are supported or not?

Answer 1

It does support multiple wildcards in the document path. There is an example in the documentation.

If you're having a problem with the emulator, file a bug report with the firebase-tools repo.