import type { Page } from 'puppeteer-core';
/**
 *
 * Helper to detect whether browser's rendering pipeline is stable
 *
 * @example
 *
 * ```ts
 * async function someTask() {
 *   const watcher = new MetricsWatcher(previewBrowser.page);
 *   await watcher.waitForStable();
 *   doSomething(previewBrowser.page);
 * }
 * ```
 *
 **/
export declare class MetricsWatcher {
    private page;
    private count;
    private length;
    private previous;
    constructor(page: Page, count?: number);
    /**
     *
     * Waits until the page's rendering process is stable.
     *
     * @remarks
     * This method checks the following counts get steady:
     *
     * - The number of DOM nodes
     * - The number of calculation style
     * - The number of calculation layout
     *
     **/
    waitForStable(): Promise<number>;
    private check;
    private diff;
    private next;
}