run-page-speed

run-page-speed.js

import fetch from 'node-fetch';

function setUpQuery(url) {
  const api = 'https://www.googleapis.com/pagespeedonline/v5/runPagespeed';
  const parameters = {
    url: encodeURIComponent(url)
  };
  let query = `${api}?`;
  for (let key in parameters) {
    query += `${key}=${parameters[key]}`;
  }
  return query;
}

async function run() {
  const query = setUpQuery('https://www.bookaway.com')
  const json = await fetch(query).then(x => x.json());
  if (json.error) {
    console.log(json.error);
    return;
  }
  // Chrome User Experience Report
  const userExperience = json.loadingExperience;
  const cruxMetrics = {
    "OVERALL": userExperience.overall_category,
    "FCP - First Contentful Paint": userExperience.metrics.FIRST_CONTENTFUL_PAINT_MS.category,
    "LCP - Largest contentful Paint": userExperience.metrics.LARGEST_CONTENTFUL_PAINT_MS.category,
    "CLS - Cumulative Layout Shift": userExperience.metrics.CUMULATIVE_LAYOUT_SHIFT_SCORE.category,
    "FID - First Input Delay": userExperience.metrics.FIRST_INPUT_DELAY_MS.category
  };

  // Lighthouse
  const lighthouse = json.lighthouseResult;
  const lighthouseMetrics = {
    'FCP - First Contentful Paint': lighthouse.audits['first-contentful-paint'].displayValue,
    'SI - Speed Index': lighthouse.audits['speed-index'].displayValue,
    'LCP - Largest Contentful Paint': lighthouse.audits['largest-contentful-paint'].displayValue,
    'TTI - Time To Interactive': lighthouse.audits['interactive'].displayValue,
    'TBT - Total Blocking Time': lighthouse.audits['total-blocking-time'].displayValue,
    'CLS - Cumulative Layout Shift': lighthouse.audits['cumulative-layout-shift'].displayValue,
    'FMP - First Meaningful Paint': lighthouse.audits['first-meaningful-paint'].displayValue,
    'First CPU Idle': lighthouse.audits['first-cpu-idle'].displayValue,
    'EID - Estimated Input Latency': lighthouse.audits['estimated-input-latency'].displayValue
  };
  console.log({ cruxMetrics, lighthouseMetrics });
}
run();