Juhla

Feast, festival, celebration

Juhla is a wrapper around the native Event Target interface. It clocks in at around 290b (195b gzip, 167b br), and uses familiar methods.

import { juhla } from 'juhla'; // notice it is juhla and not fête

const evt = juhla();

const myHandler = ({ detail }) => console.log(detail);

evt.on('my-custom-event', myHandler); 

evt.emit('my-custom-event', { detail: 'hi :)' }); // hi :)

evt.off('my-custom-event', myHandler);
// or use one to run the handler one time
evt.one('my-custom-event', myHandler);

If you need to namespace events, pass a string to the first parameter.

const myEvt = juhla('me');
const yourEvt = juhla('you');

myEvt.on('greeting', () => console.log('hi!'));
yourEvt.on('greeting', () => console.log('yoyoyo'));

myEvt.emit('greeting') // hi!
yourEvt.emit('greeting') // yoyoyo

Aliased events, like $(document).click() from jQuery, are also supported.

const $ = juhla();

$.click(incr); // is the same as
$.on('click', incr);

$.customEvent(incr); // custom events are _techinically_ supported
$.emit('customEvent'); // using $.on for these preferred

Current Limitations on the aliased functions

While all of the events are there, this also means some events that are longer are not given their shorter counterparts

For example, jQuery's .ready() event handler would become .DOMContentLoaded().

This is on the todo list, but would require increasing the size limit to achieve

Todo

• [ ] Remove extra 9 bytes from adding the aliased event handlers
• [ ] Add aliased event names, like ready for DOMContentLoaded
• [ ] Find plugin to remove unnecessary semicolons

Inspirations

• Stefan's How to use EventTarget as a web native event emitter.
• mitt: A functional 200b event emitter/pubsub.