pubsub.js

const eventMap = new Map();

export function publish(event){
	let eventName = event.constructor.name	
	if(eventName && eventMap.has(eventName)){
		eventMap.get(eventName).forEach(listener => listener(event.args))
	}
}

export function subscribe(eventClass, listener){
	let eventName = eventClass.name
	if(!eventMap.has(eventName)){
		eventMap.set(eventName, new Set());		
	}
	eventMap.get(eventName).add(listener);
  
	return{
		unsubscribe: function unsubscribe(){
			eventMap.get(eventName).delete(listener);
		}
	}
}