Interval in Framerjs

textBox = new Layer width: 350, height: 100, backgroundColor: '#333'
textBox.style =
  color: '#fff'
  padding:'40px'
  fontFamily: "Helvetica Neue, Helvetica, sans-serif"
  fontWeight: '100'
textBox.html = ""

textBox.center()

counter = 0

typeLetter = () ->
    console.log(counter)
    counter++
    textBox.html = counter

Utils.interval 0.2, typeLetter