/**
 * @license
 * Copyright (c) 2020 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
import * as webdriver from 'selenium-webdriver';
import { Server } from './server';
import { Measurement } from './types';
/**
 * Try to take a measurement in milliseconds from the given browser. Returns
 * undefined if the measurement is not available (which may just mean we need to
 * wait some more time).
 */
export declare function measure(driver: webdriver.WebDriver, measurement: Measurement, server: Server | undefined): Promise<number | undefined>;
/**
 * Return a good-enough label for the given measurement, to disambiguate cases
 * where there are multiple measurements on the same page.
 */
export declare function measurementName(measurement: Measurement): string;