import { OptionsAfterDefaults } from "../options";
/**
 * Get the storage property name for visitor id
 * @param _options
 */
export declare function getVisitorIdPropertyName(_options: Pick<OptionsAfterDefaults, 'storage_property_name' | 'property_name_factory'>): string;
/**
 * Gets visitor ID from localStorage, returns null if unavailable
 */
export declare function getVisitorId(_options: OptionsAfterDefaults): string | null;
/**
 * Sets visitor ID in localStorage
 */
export declare function setVisitorId(visitorId: string, _options: OptionsAfterDefaults): void;