barebones ES6 Event Aggregator

Eventer.js

class Eventer {
	constructor() {
  	    this.events = {};
    }
    ensureEvent(key) {
      	return this.events[key] || (this.events[key] = { subscriptions: [] });
    }
    on(key, cb) {
  	    if (typeof cb !== "function") throw new Error("You must pass a function when you subscribe");
        this.ensureEvent(key).subscriptions.push(cb);
    }
    trigger(key, ...args) {
  	    this.ensureEvent(key)
    	    .subscriptions
        .forEach(s => setTimeout(() => s.apply(null, args), 0))
    }
}


// EXAMPLE USAGE
var events = new Eventer();

var handler1 = (val) => {
	console.log("Handler 1: " + val);
}
var handler2 = (val1, val2) => {
  console.log("Handler 2: "  + val1 + val2);
}

events.on("one", handler1);
events.on("two", handler2);

setTimeout(() => events.trigger("one", "hi there"), 100);
setTimeout(() => events.trigger("two", "I am arg1", " and i'm arg 2"), 200);