jestSetup.js

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel

// MIT license

;(function () {
  var lastTime = 0
  var vendors = ['ms', 'moz', 'webkit', 'o']
  for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame']
    window.cancelAnimationFrame =
      window[vendors[x] + 'CancelAnimationFrame'] ||
      window[vendors[x] + 'CancelRequestAnimationFrame']
  }

  if (!window.requestAnimationFrame)
    window.requestAnimationFrame = function (callback, element) {
      var currTime = new Date().getTime()
      var timeToCall = Math.max(0, 16 - (currTime - lastTime))
      var id = window.setTimeout(function () {
        callback(currTime + timeToCall)
      }, timeToCall)
      lastTime = currTime + timeToCall
      return id
    }

  if (!window.cancelAnimationFrame)
    window.cancelAnimationFrame = function (id) {
      clearTimeout(id)
    }
})()