lighthouse-script.js

const puppeteer = require('puppeteer');
const fs = require('fs');

const PORT = 8041;
const PR_NUMBER = process.env.GITHUB_PR_NUMBER;
const environments = [
  {
    title: "pr",
    url: `https://frontdoor-test-docs.nginx.com/previews/docs/${PR_NUMBER}/`
  }, 
  {
    title: "main",
    url: "https://docs.nginx.com/"
  }];
const OUTPUT_DIR = './lighthouse-reports';

const signIntoFrontDoor = async (browser, env) => {
  const page = await browser.newPage();
  await page.authenticate({
    username: process.env.FRONT_DOOR_USERNAME,
    password: process.env.FRONT_DOOR_PASSWORD
  });

  await page.goto(env['url']);
  await page.waitForSelector('.navbar');
  console.log("Logged in...");
  await page.close();
}

const runLighthouse = async (env) => {
  const OUTPUT_FILE= `${env['title']}-report.json`;

  const lighthouse = (await import('lighthouse')).default;
  console.log(`Running Lighthouse for ${env['title']}...`)
  const result = await lighthouse(env['url'], { port: PORT });
  fs.writeFileSync(`${OUTPUT_DIR}/${OUTPUT_FILE}`, result.report);
}

(async () => {
  const browser = await puppeteer.launch({ args: [`--remote-debugging-port=${PORT}`], headless: true });
  if (!fs.existsSync(OUTPUT_DIR)){
    fs.mkdirSync(OUTPUT_DIR);
  }

  for(const env of environments){
    if(env['title'] == 'pr') {
      await signIntoFrontDoor(browser, env);
    }
    await runLighthouse(env);
  }

  await browser.close();
})();