timer.js

const createTimer = () => {
  let paused = true
  let counter = 0
  let interval

  return {
    play() {
      paused = false
      interval = setInterval(() => counter += 1, 1000)
    },
    pause() {
      paused = true
      clearInterval(interval)
    },
    toggle() {
      paused ? this.play() : this.pause()
      paused = !paused
    },
    get paused() {
      return paused
    },
    get current(){
      return counter
    }
  }
}