// jsdom doesn't have support for requestAnimationFrame so we just make it work.
global.requestAnimationFrame = function (func) {
  var args = Array.prototype.slice.call(arguments).slice(1);
  return func.apply(this, args);
};

// jsdom doesn't have support for requestAnimationFrame so we polyfill it.
// https://gist.github.com/paulirish/1579671
(function() {
  var lastTime = 0;
  var vendors = ['ms', 'moz', 'webkit', 'o'];

  for (var x = 0; x < vendors.length && !global.requestAnimationFrame; ++x) {
    global.requestAnimationFrame = global[vendors[x] + 'RequestAnimationFrame'];
    global.cancelAnimationFrame = global[vendors[x] + 'CancelAnimationFrame']
      || global[vendors[x] + 'CancelRequestAnimationFrame'];
  }

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

      lastTime = currTime + timeToCall;
      return id;
    };

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

Implement a better requestAnimationFrame polyfill
Implement a better requestAnimationFrame polyfill
