Validator
A function that takes the FieldContext for the field being validated and returns a ValidationResult indicating errors for the field and its sub-fields. In a Validator all errors must explicitly define their target field.
API
type Validator<TValue, TPathKind extends PathKind = PathKind.Root> = LogicFn< TValue, ValidationResult, TPathKind >
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https://angular.dev/api/forms/signals/Validator
