index.js

const fs = require("fs");
const lighthouse = require("lighthouse");
const chromeLauncher = require("chrome-launcher");

(async () => {
  const chrome = await chromeLauncher.launch({ chromeFlags: ["--headless"] });
  const options = {
    logLevel: "info",
    output: "html",
    onlyCategories: ["performance"],
    port: chrome.port,
  };
  const runnerResult = await lighthouse("https://pfe.porter.in/dashboard/payments", options, {
    extends: "lighthouse:default",
    settings: {
      onlyAudits: [
        "first-meaningful-paint",
        "speed-index",
        "interactive",
        "largest-contentful-paint",
        "total-blocking-time",
        "cumulative-layout-shift",
      ],
    },
  });

  // `.report` is the HTML report as a string
  const reportHtml = runnerResult.report;
  fs.writeFileSync("lhreport.html", reportHtml);

  // `.lhr` is the Lighthouse Result as a JS object
  console.log("Report is done for", runnerResult.lhr.finalUrl);
  console.log(
    "Performance score was",
    runnerResult.lhr.categories.performance.score * 100
  );

  await chrome.kill();
})();