Rethinking events using ES6 (https://tbranyen.com/events)

events.js

const bus = {};
const get = e => (bus[e] = bus[e] || new Set());

export const listeners = new Proxy(bus, { get });
export const emit = (e, ...args) => listeners[e].forEach(fn => fn(...args));

usage.js

import { listeners, emit } from '//tbranyen.com/events';

// Simply name any property on listeners and it will become an event.
listeners.onUpdate.add(updated => console.log('Updated:', updated));

// Instruct an event to be emitted.
emit('onUpdate', 'Hello world');

// Clear all `onUpdate` events.
listeners.onUpdate.clear();