##Use case
In the Flutter material, the textFomField has a validator which checks the value entered by the user and then returns an error if the input is invalid or null
https://api.flutter.dev/flutter/material/TextFormField-class.html

So, today I was working on the Macos version of my app and discovered that the validator is not available in the MacosTextField. I had to build a validator using bloc to validate the text and return errors to users about their input

I searched online and discovered that Apple does not have a validator out of the box like Flutter.

Proposal

So, what I am proposing here is to add a validator similar to what material Flutter uses in the TextFormField, which can help a lot to return errors and show the user what he has to do.