# all files / src/ index.js

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     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    'use strict';

    const semver = require('semver');
    const log = require('../src/lib/log.js');
    const ChromeProtocol = require('../src/lib/drivers/cri.js');
    const lighthouse = require('../src/lighthouse');

    // node 5.x required due to use of ES2015 features
    if (semver.lt(process.version, '5.0.0')) {
      throw new Error('Lighthouse requires node version 5.0 or newer');
    }

    module.exports = function(url, flags) {
      return new Promise((resolve, reject) => {
        if (!url) {
          return reject(new Error('Lighthouse requires a URL'));
        }
        flags = flags || {};

        const driver = new ChromeProtocol();

        // set logging preferences, assume quiet
        log.level = 'error';

        // There's little point in testing the logging level, so skip.
        /* istanbul ignore if */
        Iif (flags.logLevel) {
          log.level = flags.logLevel;
        }

        // kick off a lighthouse run
        resolve(lighthouse(driver, {url, flags}));
      });
    };