PrefixAction in V.4 ( missing docs?)

 TextInput::make('email')
  ->email()
  ->hint('Click icon to open email app.')
  ->prefixAction(
      Action::make('open-email')
      ->icon('heroicon-m-envelope')
     ->color('success')
     ->url(function($record){
        if($record?->email) {
            return "mailto:{$record->email}";
        }else{
           return null;// No email, don't open email client
        }

     })
  ),
...