Asynchronous validator

[farukaziz]

How do I validate asynchronously? The validator require String return so I can not add Future

How can I do like as below with Flutter form builder?

validator: myValidator

Future myValidator(String userId) async{
    return await checkUser(userId);
}

[nolandg]

This would be a great feature. Use cases include things checking if an email addresses already exists in db, using a cloud function to check an image for adult content, hit a cloud spam-checking service to validate text, etc. Allowing this to happen async would really make a smooth flow and not have to break the pattern.