import { OBJECT_IDENTIFIER } from "@wildboar/asn1";
import { ObjectClassKind } from "../modules/InformationFramework/ObjectClassKind.ta.mjs";
/**
 * @summary Validate a set of object classes
 * @description
 *
 * There are restrictions on which object classes may be used together. This
 * function validates a set of object classes for compliance to these
 * restrictions, which are specified in ITU-T Recommendation X.501 (2019),
 * Sections 8.3 and 13.3.1.
 *
 * Quoting section 13.3.1:
 *
 * > There are restrictions on subclassing, namely:
 * >
 * > - only abstract object classes shall be superclasses of other abstract object classes.
 * > - a structural object class shall not be derived from auxiliary object classes.
 * > - an auxiliary object class shall not be derived from structural object classes.
 * >
 * > There is one special object class, of which every structural object class
 * > is a subclass. This object class is called top. top is an abstract object
 * > class.
 *
 * I don't think an implementation of this can be done without allocation and
 * without introducing O(n^2) time complexity, since each object class must be
 * compared against other object classes in the set. You need at least one `Set`.
 *
 * @param {OBJECT_IDENTIFIER[]} objectClasses The object classes to be validated
 * @param {Function} getKind A function that returns the object class' kind given its OID
 * @param {Function} getSuperclasses A function that returns the object class' superclasses
 *   given its OID
 * @returns {ObjectIdentifier} The structural object class if the object classes
 *  are valid, or `null` otherwise.
 * @function
 */
export declare function validateObjectClasses(objectClasses: OBJECT_IDENTIFIER[], getKind: (objectClass: OBJECT_IDENTIFIER) => ObjectClassKind | undefined | null, getSuperclasses: (objectClass: OBJECT_IDENTIFIER) => OBJECT_IDENTIFIER[]): OBJECT_IDENTIFIER | null;
export default validateObjectClasses;
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