how calculate Lighthouse feature in browsers

How to Calculate Lighthouse Feature in Browsers

When it comes to optimizing the performance of your website, one of the most valuable tools available is Lighthouse. Lighthouse is an open-source, automated tool developed by Google that audits the performance, accessibility, and other aspects of web pages. It provides a comprehensive report with suggestions on how to improve your website’s performance.

In this blog post, we will explore how to calculate Lighthouse features in different browsers using TypeScript. We will cover two different solutions to achieve this.

Solution 1: Using Puppeteer

Puppeteer is a Node.js library that provides a high-level API for controlling headless Chrome or Chromium browsers. It allows us to automate tasks such as generating Lighthouse reports.

Here is an example code snippet that demonstrates how to calculate Lighthouse features using Puppeteer:

import puppeteer from 'puppeteer';

async function calculateLighthouseFeatures(url: string) {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto(url);

  const lighthouseReport = await page.evaluate(() => {
    return window.lighthouse.getLighthouseFeatures();
  });

  await browser.close();

  return lighthouseReport;
}

const url = 'https://example.com';
const lighthouseFeatures = calculateLighthouseFeatures(url);

console.log(lighthouseFeatures);

This code snippet uses Puppeteer to launch a headless browser, navigate to the specified URL, and then evaluate a JavaScript function on the page to retrieve the Lighthouse features. Finally, it logs the calculated features to the console.

Solution 2: Using Lighthouse API

If you prefer not to use Puppeteer or need more flexibility, you can also use the Lighthouse API directly. The Lighthouse API allows you to programmatically run Lighthouse audits and retrieve the results.

Here is an example code snippet that demonstrates how to calculate Lighthouse features using the Lighthouse API:

import { lighthouse } from 'lighthouse';
import { launch } from 'chrome-launcher';

async function calculateLighthouseFeatures(url: string) {
  const chrome = await launch();
  const options = { port: chrome.port };
  const lighthouseReport = await lighthouse(url, options);

  return lighthouseReport.lhr;
}

const url = 'https://example.com';
const lighthouseFeatures = calculateLighthouseFeatures(url);

console.log(lighthouseFeatures);

This code snippet uses the Lighthouse API to launch a headless Chrome browser, run a Lighthouse audit on the specified URL, and retrieve the calculated features. Finally, it logs the features to the console.

Both solutions provide a way to calculate Lighthouse features in browsers using TypeScript. Choose the solution that best fits your needs and integrate it into your workflow to optimize your website’s performance.

That’s it! Now you know how to calculate Lighthouse features in browsers using TypeScript. Start using these solutions to improve your website’s performance and provide a better user experience.