title: What is the Firebase RefBuilder.onOperation<T> method?
body: <p>I am wondering what the onOperation method of functions.database.RefBuilder is for as I can not find any information about it in the <a href="https://firebase.google.com/docs/reference/functions/functions.database.RefBuilder" rel="nofollow noreferrer">documentation.</a> </p>
  
  <p><a href="https://i.stack.imgur.com/moCzP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/moCzP.png" alt="enter image description here"></a></p>