@happy-dom/global-registrator

About

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.

The goal of Happy DOM is to emulate enough of a web browser to be useful for testing, scraping web sites and server-side rendering.

Happy DOM focuses heavily on performance and can be used as an alternative to JSDOM.

This package contains a utility that registers Happy DOM globally, which makes it possible to use Happy DOM for testing in a Node environment.

DOM Features

• Custom Elements (Web Components)

• Shadow Root (Shadow DOM)

• Declarative Shadow DOM

• Mutation Observer

• Tree Walker

• Fetch

And much more..

Works With

• Google LitHTML

• Google LitElement

• React

• Angular

• Vue

Installation

npm install @happy-dom/global-registrator --save-dev

Usage

Register

import { GlobalRegistrator } from '@happy-dom/global-registrator';

GlobalRegistrator.register();

document.body.innerHTML = `<button>My button</button>`;

const button = document.querySelector('button');

// Outputs: "My button"
console.log(button.innerText)

Unregister

import { GlobalRegistrator } from '@happy-dom/global-registrator';

GlobalRegistrator.register();

GlobalRegistrator.unregister();

// Outputs: "undefined"
console.log(global.document)

Performance

Operation	JSDOM	Happy DOM
Import / Require	333 ms	45 ms
Parse HTML	256 ms	26 ms
Serialize HTML	65 ms	8 ms
Render custom element	214 ms	19 ms
querySelectorAll('tagname')	4.9 ms	0.7 ms
querySelectorAll('.class')	6.4 ms	3.7 ms
querySelectorAll('[attribute]')	4.0 ms	1.7 ms
querySelectorAll('[class~="name"]')	5.5 ms	2.9 ms
querySelectorAll(':nth-child(2n+1)')	10.4 ms	3.8 ms

See how the test was done here