Interface RuleDef<T, FieldValue>

interface RuleDef<T, FieldValue = unknown> {
    custom: <LenientFieldValue>(fn: CustomValidator<LenientFieldValue>) => T;
    error: (message?: string | LocalizedValidationMessages) => T;
    info: (message?: string | LocalizedValidationMessages) => T;
    required: () => T;
    valueOfField: (path: string | string[]) => FieldReference;
    warning: (message?: string | LocalizedValidationMessages) => T;
}