PuckJS - Light switch

puckLight.js

const LEDS = [LED1,LED2,LED3];

const onBtnClick = 
(fn)=> setWatch(fn, BTN, {edge:"rising", debounce:50, repeat:true});

const turnOn = (el) => {
    el.write(true);
};

const turnOff = (el) => {
    el.write(false);
};


const schedule = (fn,time) => new Promise(function(ac){
  (new Promise((a,r)=>{
    a(fn());
  })).then(()=>{
    setTimeout(ac,time);
  });
});

let current = 0;
let currentLed = LEDS[current];
onBtnClick(function(){
  schedule(()=>{
    console.log('blip');
    turnOn(currentLed);
   },3000)
  .then(()=>{
    turnOff(currentLed);
    current = (current > 1) ? 0 : current + 1;
    currentLed = LEDS[current];
  });
});