window-resizeto

A window.resizeTo polyfill for test environments like Jest & JSDOM.

Installation

npm i -D window-resizeto

Usage

There are a few different ways you can use window-resizeto:

• With Jest:

  // jest.config.js
  module.exports = {
    setupFilesAfterEnv: [
      // polyfill window.resizeTo
      'window-resizeto/polyfill'
    ]
  }

  // some-test.spec.js
  window.resizeTo(500, 500)
  // window is now resize to 500x500

• Standalone with the polyfill:

  import 'window-resizeto/polyfill'
  
  window.resizeTo(500, 500)
  // window is now resized to 500x500

• With the ponyfill:

  import { resizeTo } from 'window-resizeto'
  
  resizeTo(window, 500, 500)
  // window is now resized to 500x500

How it works

Basically just sets the window's outerWidth, outerHeight, innerWidth, innerHeight, and fires a resize event. The source code is currently just <10 LoC, so take a look under the hood! :)

Credits

Inspiration for creating this came from mq-polyfill and a few other code samples that are nearly exact replicas. I wanted a package I could re-use in my projects' tests instead of having to constantly create a helper file, and so window-resizeto was born!