nodeExample.js

const lighthouse = require('lighthouse');
const perfConfig = require('lighthouse/lighthouse-core/config/perf.json');
const chromeLauncher = require('lighthouse/chrome-launcher');
const debug = require('debug')('speed');
function launchChromeAndRunLighthouse(url, flags = {}, config = null) {
  return chromeLauncher.launch().then(chrome => {
    flags.chromeFlags = [
      '--headless',
      '--disable-gpu',
      '--no-sandbox',
    ]
    flags.port = chrome.port;
    return lighthouse(url, flags, config).then(results =>
      chrome.kill().then(() => results));
  });
  }

  const flags = {};

// Usage:
launchChromeAndRunLighthouse('https://www.google.com', flags, perfConfig).then(results => {
  debug('User-agent: %s\n', results.userAgent);
  debug('Here are some metrics we care about...');
  debug(
    '• First meaningful paint: %d (%d)',
    results.audits['first-meaningful-paint'].rawValue,
    results.audits['first-meaningful-paint'].score
  );
  debug(
    '• Speed Index: %d (%d)',
    results.audits['speed-index-metric'].rawValue,
    results.audits['speed-index-metric'].score
  );
  debug(
    '• First interactive: %d (%d)',
    results.audits['first-interactive'].rawValue,
    results.audits['first-interactive'].score
  );
  debug(
    '• Total byte weight: %d (%d)',
    results.audits['total-byte-weight'].rawValue,
    results.audits['total-byte-weight'].score
  );
  if (results.audits['first-meaningful-paint'].score > 20) {
    process.exit(0);
  }
  process.exit(1);
});