Interface DocumentRule

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