import { HoistModel, PageState } from '@xh/hoist/core';
/**
 * Implementation of PageState maintenance.
 *
 * Based on https://developer.chrome.com/blog/page-lifecycle-api/
 *
 * @internal
 */
export declare class PageStateModel extends HoistModel {
    xhImpl: boolean;
    state: PageState;
    constructor();
    private setState;
    private getLiveState;
    private addListeners;
}