What can be the possible input to "when user profile updated " in firebase authentication

I was working with an app with firebase authentication I am stuck when I have to use "when user profile updated " what is the syntax for this or what can we write in get type!
This is the pic of the block
Thanks in advance for help

I am not much familiar with firebase authentication component, but I believe that the event shown in your provided image, is triggered when user’s phone number, mail or profile is updated by any of the below methods

And under that mentioned event(in your provided image), the text parameter may return a updated text(updated email, contact, etc)