lighthouse/extension/app/scripts.babel/chromereload.js

> Stops you crashing into the rocks; lights the way

/**
 * @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';

// Reload client for Chrome Apps & Extensions.
// The reload client has a compatibility with livereload.
// WARNING: only supports reload command.

const LIVERELOAD_HOST = 'localhost:';
const LIVERELOAD_PORT = 35729;
const connection = new WebSocket('ws://' + LIVERELOAD_HOST + LIVERELOAD_PORT + '/livereload');

connection.onerror = error => {
  console.log('reload connection got error:', error);
};

connection.onmessage = e => {
  if (e.data) {
    const data = JSON.parse(e.data);
    if (data && data.command === 'reload') {
      chrome.runtime.reload();
    }
  }
};