rAF.js for node+browserify+babel

rAF.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

if (process.browser) {
  let window = global.window;
  let lastTime = 0;
  const vendors = ['ms', 'moz', 'webkit', 'o'];
  const vl = vendors.length;
  for(let x = 0; x < vl && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
    window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] ||
      window[vendors[x]+'CancelRequestAnimationFrame'];
  }

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

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