Function timer

cf/src/connection.js:1044–1064

(fn, seconds)

}

function timer(fn, seconds) {
  seconds = typeof seconds === 'function' ? seconds() : seconds
  if (!seconds)
    return { cancel: noop, start: noop }

  let timer
  return {
    cancel() {
      timer && (clearTimeout(timer), timer = null)
    },
    start() {
      timer && clearTimeout(timer)
      timer = setTimeout(done, seconds * 1000, arguments)
    }
  }

  function done(args) {
    fn.apply(null, args)
    timer = null
  }
}