/**
 * @license
 * Copyright 2020 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
import * as webdriver from 'selenium-webdriver';
import { Server } from './server.js';
import { Measurement } from './types.js';
/**
 * 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;