README.md

event-target-shim

An implementation of WHATWG EventTarget interface and WHATWG Event interface. This implementation supports constructor, passive, once, and signal.

This implementation is designed ...

• Working fine on both browsers and Node.js.
• TypeScript friendly.

Native Support Information:

Feature	IE	Edge	Firefox	Chrome	Safari	Node.js
Event constructor	❌	12	11	15	6	15.4.0
EventTarget constructor	❌	87	84	87	14	15.4.0
passive option	❌	16	49	51	10	15.4.0
once option	❌	16	50	55	10	15.4.0
signal option	❌	❌	❌	❌	❌	❌

---

💿 Installation

Use npm or a compatible tool.

npm install event-target-shim

📖 Getting started

import { EventTarget, Event } from "event-target-shim";

// constructor (was added to the standard on 8 Jul 2017)
const myNode = new EventTarget();

// passive flag (was added to the standard on 6 Jan 2016)
myNode.addEventListener(
  "hello",
  (e) => {
    e.preventDefault(); // ignored and print warning on console.
  },
  { passive: true }
);

// once flag (was added to the standard on 15 Apr 2016)
myNode.addEventListener("hello", listener, { once: true });
myNode.dispatchEvent(new Event("hello")); // remove the listener after call.

// signal (was added to the standard on 4 Dec 2020)
const ac = new AbortController();
myNode.addEventListener("hello", listener, { signal: ac.signal });
ac.abort(); // remove the listener.

• For browsers, there are two ways:
  • use a bundler such as Webpack to bundle. If you want to support IE11, use import {} from "event-target-shim/es5" instead. It's a transpiled code by babel. It depends on @baebl/runtime (^7.12.0) package.
  • use CDN such as unpkg.com. For example, <script src="https://unpkg.com/event-target-shim@6.0.2"></script> will define EventTargetShim global variable.
• The AbortController class was added to the standard on 14 Jul 2017. If you want the shim of that, use abort-controller package.

Runnable Examples

• Basic Example
• Basic Example (IE11)

📚 API Reference

See docs/reference.md.

💥 Migrating to v6

See docs/migrating-to-v6.md.

📰 Changelog

See GitHub releases.

🍻 Contributing

Contributing is welcome ❤️

Please use GitHub issues/PRs.

Development tools

• npm install installs dependencies for development.
• npm test runs tests and measures code coverage.
• npm run watch:mocha runs tests on each file change.