validate()

Validates the current form values according to the validation schema.

validate(): TSchema | undefined;

This method returns the validated fields as a plain object, and also updates the errors and valid properties.
In auto mode (default), after this method has been called at least once, fields are also validated automatically whenever a field is updated using set(). To stop automatic validation until this method is called again, use the clear() method.
In demand mode, this method does not enable automatic validation.
In immediate mode, fields are always validated automatically, regardless of whether this method has been called.

class FormState
An object that contains form field data, with validation rules.
type FormState.ValidationMode static
A type that determines how form field validation is triggered.

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