Please provide a short note/sample about the precondition argument the delete() function can accept in the doc page.
I was referring firestore delete docs and couldn't found any.
It would be nice if you reflect the docs on the definition file also (for better IDE support).

Relevant code:
I was using firestore via firebase-admin:

  await fireAdmin
    .firestore()
    .collection("projects")
    .doc("doc-id")
    .delete(/* precondition */);