Introduction to Browserslist

Browserslist is a tool that allows you to maintain a consistent browser support policy across your frontend projects. By defining which browsers you want to support, Browserslist enables various tools, including Autoprefixer, ESLint, and Babel, to interpret your browser support queries.

Understanding Browser Queries

To specify supported browsers, you can use queries like:

• last 2 versions: the last 2 versions of each major browser
• > 1%: browsers with more than 1% of global market share
• not dead: exclude browsers that are not maintained

Installing Browserslist

 npm install browserslist 

API Examples

Loading Configurations

 const browserslist = require('browserslist'); const myBrowsers = browserslist(); console.log(myBrowsers); // => ['>= 0.5%', 'last 2 versions', 'Firefox ESR', 'not dead'] 

Using a Specific Query

 const browserslist = require('browserslist'); const specificQueryBrowsers = browserslist('> 5%, last 1 version'); console.log(specificQueryBrowsers); // => ['chrome 91', 'firefox 89'] 

Loading Configurations from File

Place a .browserslistrc file in the root of your project with contents:

 last 2 versions > 1% not dead 

 const browserslist = require('browserslist'); const fileConfigBrowsers = browserslist(undefined, { path: process.cwd() }); console.log(fileConfigBrowsers); // => ['> 0.5%', 'last 2 versions', 'Firefox ESR', 'not dead'] 

Browser Coverage Statistics

 const browserslist = require('browserslist'); const coverage = browserslist.coverage(browserslist('> 1%')); console.log(`These browsers represent ${coverage}% of all users globally`); // => These browsers represent 92.97% of all users globally 

Example Application Using Browserslist

Let’s create a simple Node.js application that identifies the supported browsers and shows their coverage:

 // index.js const browserslist = require('browserslist');
const browsers = browserslist('last 2 versions, > 1%, not dead'); const coverage = browserslist.coverage(browsers);
console.log('Supported browsers:', browsers); console.log(`Global coverage: ${coverage}%`); 

To run this application:

 node index.js 

This script will display the supported browsers and their global usage coverage.

By leveraging Browserslist, you can ensure your web applications are flexible and compatible with the browsers your users are utilizing, fostering an inclusive and fully functional user experience.

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