import type { OpaqueDefaultId } from '../common/models/unique-props';
/**
 * A helper function to return a zone id given an id and a fallback default id.
 * This would be used in serializable zones that have a default id as one of its props.
 *
 * @param id - the main id prop for a zone
 * @param defaultId - the fallback id to use if the id is undefined
 * @return
 */
export declare const getZoneId: (id: string | undefined, defaultId: OpaqueDefaultId | string | undefined) => string | undefined;