tiny-tim/src/index.js

Meet Tim, a small, simple timer

module.exports = (unit, suffix) => {
  var divs = { ms: 1, s: 1e3, m: 6e4, h: 36e5 }
  var div = divs[unit || 's']
  var append = suffix && div ? unit : 0
  var start = +new Date

  return () => {
    var time = (+new Date - start) / div
    return (suffix !== 'ms' ? +time.toFixed(2) : time) + append
  }
}