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Lighthouse Puppeteer - NPM Package

• Google Chrome Headless is the Google Chrome browser that can be started without graphical interface to accomplish several tasks (PDF printing, performance, automation...)
• Google Lighthouse analyzes web apps and web pages, collecting modern performance metrics and insights on developer best practices.
• Google Puppeteer is a tool to automate tasks on a Chrome (headless) browser.

Description

The purpose of this package image is to produce performance report for several pages in connected mode and in an automated (programmated) way.

It uses lighthouse-batch to be able to automate export of multiple

Installation

npm install -g google-lighthouse-puppeteer --unsafe-perm=true

CLI Usage

$> lighthouse-puppeteer -h

Options

  -f, --file FILE         Path to your testcase REQUIRED (default option)
                          (example: /home/chrome/testcases/mytestcase.js)
  -p, --port PORT         Chrome headless debug port (default: 9222)
  -c, --chromium_params   Optional parameters to pass to chrome/chromium browser
                            (https://peter.sh/experiments/chromium-command-line-switches/)
                            (example: "- --no-sandbox --disable-setuid-sandbox --ssl-version-max=tls1.1")
  -v, --verbose           Providing this option once will show more info from Lighthouse.
                            Providing it twice will additionally provide info from `lighthouse-batch`.
  -h, --help              Print this usage guide.

Lighthouse

  -d, --output_directory FOLDER   Path to output reports
                                  (default: /home/chrome/reports)
  -w, --html                      Renders HTML reports alongside JSON reports
  -l, --lighthouse_params         Optional parameters to pass to lighthouse
                                  (https://github.com/GoogleChrome/lighthouse/#cli-options)
                                  (example: "- --quiet --perf")

Puppeteer

  You can add your options for puppeteer by prefixing them with --puppeteer-
  (https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#puppeteerlaunchoptions)

  example: "--puppeteer-ignoreHTTPSErrors --puppeteer-slowMo 20"

Docker

You can see https://github.com/femtopixel/docker-google-lighthouse-puppeteer or https://hub.docker.com/r/femtopixel/google-lighthouse-puppeteer for more informations.

Environment

If you want to use your own Chrome/Chromium instead of the provided by Puppeteer, you can add the following two environment variables:

# This environment is used by puppeteer to know where your chrome browser installed in located
CHROME_PATH=/usr/bin/chromium-browser
# This environment tells puppeteer and npm to not install the browser in node_modules
PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true

Package Usage

const lp = require('google-lighthouse-puppeteer');
const options = {};
lp.exec('/path/to/my/test.js', options)
    .then(() => console.log('everything ok'))
    .catch((err) => console.error(err));

Options

You can change some options like in CLI :

{
    "main": {
      "port":9222,
      "verbose":[true, true]
    },
    "lighthouse": {
        "params":"",
        "output_directory":"/home/chrome/reports",
        "lighthouse_params":""
    },
    "chromium": "--no-sandbox --disable-setuid-sandbox --ssl-version-max=tls1.1",
    "_unknown": [
        "--puppeteer-ignoreHTTPSErrors",
        "--puppeteer-slowMo",
        "20"
    ]
}

For puppeteer, all params must be added in the _unknown entry and are prefixed with --puppeteer-. Each value must be in separated entry.

verbose is an array of true, the more true the more talkative the application.

Lighthouse params can be added respecting their documentation

API

You should create a testcase file named whateverYouWant.js.

This file must module.exports an object which must contain two methods : connect and getUrls.

connect

This method must return a Promise which resolves the browser (first argument received of the method connect).

The purpose of this method is to connect the user to the browser.

getUrls

This method must return an array of string for the url to be tested. You can put url restricted by connection since the connect method will grant you access.

Implementation

class whateverYouWant
{
    getUrls() {
        return [
           "https://myawsome.site/admin/heavypage",
           "https://myawsome.site/admin/lightpage",
       ];
    }

    connect(browser) {
        return new Promise(async (resolve, reject) => {
            const page = await browser.newPage();
            await page.goto('https://myawesome.site/admin/authentication', {waitUntil: 'load'});
            await page.type('#login', 'admin');
            await page.type('#password', 'admin');
            await page.$eval('#form input[type=submit]', x => x.click());
            await page.waitForNavigation({waitUntil: 'networkidle2'});
            resolve(browser);
        });
    }
}

module.exports = new whateverYouWant();