mq-polyfill

CSSOM-valid and jsdom/Jest-compatible matchMedia polyfill for server-side unit tests.

Install

npm install --save-dev mq-polyfill

Usage

import { jsdom } from 'jsdom';
import matchMediaPolyfill from 'mq-polyfill';

const window = jsdom().defaultView;

/**
 * Define the window.matchMedia
 */
matchMediaPolyfill(window);

window
  .matchMedia('(min-width: 920px)') // Create MediaQueryList instance
  .addListener(console.log);        // Subscribe to MQ mode changes

/**
 * For dispatching resize event
 * we must implement window.resizeTo in jsdom
 */
window.resizeTo = function resizeTo(width, height) {
  Object.assign(this, {
    innerWidth: width,
    innerHeight: height,
    outerWidth: width,
    outerHeight: height,
  }).dispatchEvent(new this.Event('resize'));
};

window.resizeTo(800, 600);
// console.log() output:
// MediaQueryList { media: '(min-width: 920px)', matches: false }

window.resizeTo(720, 480);
// Do nothing (MQ mode heven't changed)

window.resizeTo(1024, 768);
// console.log() output:
// MediaQueryList { media: '(min-width: 920px)', matches: true }