Drop in replace functions for setTimeout and setInterval that make use of requestAnimationFrame.

raf.js

(function(window) {
	let lastTime = 0,
		vendors = ['webkit', 'moz'],
		requestAnimationFrame = window.requestAnimationFrame,
		cancelAnimationFrame = window.cancelAnimationFrame,
		i = vendors.length;

	// try to un-prefix existing raf
	while (--i >= 0 && !requestAnimationFrame) {
		requestAnimationFrame = window[vendors[i] + 'RequestAnimationFrame'];
		cancelAnimationFrame = window[vendors[i] + 'CancelAnimationFrame'];
	}

	// polyfill with setTimeout fallback
	// heavily inspired from @darius gist mod: https://gist.github.com/paulirish/1579671#comment-837945
	if (!requestAnimationFrame || !cancelAnimationFrame) {
		requestAnimationFrame = function(callback) {
			var now = +new Date(),
				nextTime = Math.max(lastTime + 16, now);
			return setTimeout(function() {
				callback((lastTime = nextTime));
			}, nextTime - now);
		};

		cancelAnimationFrame = clearTimeout;
	}

	// export to window
	window.requestAnimationFrame = requestAnimationFrame;
	window.cancelAnimationFrame = cancelAnimationFrame;
})(window);

let __setTimeout = (fn, delay) => {
	let handler = {};
	let now = Date.now,
		st = now();
	let loop = () => {
		let current = now(),
			delta = current - st;
		if (delta >= delay) {
			fn.call();
			cancelAnimationFrame(handler.id);
		} else {
			handler.id = requestAnimationFrame(loop);
		}
	};
	handler.id = requestAnimationFrame(loop);
	return handler;
};

let __setInterval = (fn, delay) => {
	let handler = {};
	let now = Date.now,
		st = now();
	let loop = () => {
		let current = now(),
			delta = current - st;
		if (delta >= delay) {
			fn.call();
			st = now();
		}
		handler.id = requestAnimationFrame(loop);
	};
	handler.id = requestAnimationFrame(loop);
	return handler;
};

let __clearTimeout = (handler) => {
	let id = handler ? handler.id : null;
	cancelAnimationFrame(id);
};

let __clearInterval = __clearTimeout;

export default {
	setTimeout: __setTimeout,
	clearTimeout: __clearTimeout,
	setInterval: __setInterval,
	clearInterval: __clearInterval
};