xchess/lib/emitter.js

Chess Engine

export {Emitter}

class Emitter extends EventTarget {

	on(type, listener){
		this.addEventListener(type, listener);
		return this;
	}

	once(type, listener){
		this.addEventListener(type, listener, {once: true});
		return this;
	}

	off(type, listener){
		this.removeEventListener(type, listener);
		return this;
	}
}