animationFrame.js
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	import canUseDOM from './canUseDOM';

	/* https://github.com/component/raf */
	var prev = new Date().getTime();

	function fallback(fn) {
	var curr = new Date().getTime();
	var ms = Math.max(0, 16 - (curr - prev));
	var handle = setTimeout(fn, ms);
	prev = curr;
	return handle;
	}

	var vendors = ['', 'webkit', 'moz', 'o', 'ms'];
	var cancelMethod = 'clearTimeout';
	var rafImpl = fallback; // eslint-disable-next-line import/no-mutable-exports

	var getKey = function getKey(vendor, k) {
	return vendor + (!vendor ? k : k[0].toUpperCase() + k.substr(1)) + "AnimationFrame";
	};

	if (canUseDOM) {
	vendors.some(function (vendor) {
	var rafMethod = getKey(vendor, 'request');

	if (rafMethod in window) {
	cancelMethod = getKey(vendor, 'cancel'); // @ts-ignore

	rafImpl = function rafImpl(cb) {
	return window[rafMethod](cb);
	};
	}

	return !!rafImpl;
	});
	}

	export var cancel = function cancel(id) {
	// @ts-ignore
	if (typeof window[cancelMethod] === 'function') window[cancelMethod](id);
	};
	export var request = rafImpl;