/**
 * @module node-opcua-address-space
 *
 * Bumped each time a ReferenceType node is created, in any namespace. Every cache derived from
 * the reference-type hierarchy (the subtype index of a reference type, the memoized result of
 * `findReferencesEx`) records the value it was built with and rebuilds when it moved, since a
 * reference type loaded later may be a subtype of one that was already indexed.
 *
 * A module of its own so that BaseNodeImpl and UAReferenceTypeImpl can both read it without
 * importing each other at module-evaluation time.
 */
export declare const referenceTypeVersion: {
    count: number;
};
/**
 * Bumped each time a HasSubtype reference is added to or removed from any node: the memo of
 * `isSubtypeOf` answers of every type records the value it was built with and starts afresh when
 * it moved, since re-parenting a type changes the answer for every type below it.
 */
export declare const typeHierarchyVersion: {
    count: number;
};