FieldValidator
Функция, которая принимает FieldContext для проверяемого поля и возвращает ValidationResult с указанием ошибок поля.
API
type FieldValidator<TValue, TPathKind extends PathKind = PathKind.Root> = LogicFn< TValue, ValidationResult<ValidationError.WithoutFieldTree>, TPathKind >
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https://angular.dev/api/forms/signals/FieldValidator
