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	var global = require('../internals/global');
	var apply = require('../internals/function-apply');
	var bind = require('../internals/function-bind-context');
	var isCallable = require('../internals/is-callable');
	var hasOwn = require('../internals/has-own-property');
	var fails = require('../internals/fails');
	var html = require('../internals/html');
	var arraySlice = require('../internals/array-slice');
	var createElement = require('../internals/document-create-element');
	var validateArgumentsLength = require('../internals/validate-arguments-length');
	var IS_IOS = require('../internals/engine-is-ios');
	var IS_NODE = require('../internals/engine-is-node');

	var set = global.setImmediate;
	var clear = global.clearImmediate;
	var process = global.process;
	var Dispatch = global.Dispatch;
	var Function = global.Function;
	var MessageChannel = global.MessageChannel;
	var String = global.String;
	var counter = 0;
	var queue = {};
	var ONREADYSTATECHANGE = 'onreadystatechange';
	var $location, defer, channel, port;

	try {
	// Deno throws a ReferenceError on `location` access without `--location` flag
	$location = global.location;
	} catch (error) { /* empty */ }

	var run = function (id) {
	if (hasOwn(queue, id)) {
	var fn = queue[id];
	delete queue[id];
	fn();
	}
	};

	var runner = function (id) {
	return function () {
	run(id);
	};
	};

	var listener = function (event) {
	run(event.data);
	};

	var post = function (id) {
	// old engines have not location.origin
	global.postMessage(String(id), $location.protocol + '//' + $location.host);
	};

	// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
	if (!set \|\| !clear) {
	set = function setImmediate(handler) {
	validateArgumentsLength(arguments.length, 1);
	var fn = isCallable(handler) ? handler : Function(handler);
	var args = arraySlice(arguments, 1);
	queue[++counter] = function () {
	apply(fn, undefined, args);
	};
	defer(counter);
	return counter;
	};
	clear = function clearImmediate(id) {
	delete queue[id];
	};
	// Node.js 0.8-
	if (IS_NODE) {
	defer = function (id) {
	process.nextTick(runner(id));
	};
	// Sphere (JS game engine) Dispatch API
	} else if (Dispatch && Dispatch.now) {
	defer = function (id) {
	Dispatch.now(runner(id));
	};
	// Browsers with MessageChannel, includes WebWorkers
	// except iOS - https://github.com/zloirock/core-js/issues/624
	} else if (MessageChannel && !IS_IOS) {
	channel = new MessageChannel();
	port = channel.port2;
	channel.port1.onmessage = listener;
	defer = bind(port.postMessage, port);
	// Browsers with postMessage, skip WebWorkers
	// IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
	} else if (
	global.addEventListener &&
	isCallable(global.postMessage) &&
	!global.importScripts &&
	$location && $location.protocol !== 'file:' &&
	!fails(post)
	) {
	defer = post;
	global.addEventListener('message', listener, false);
	// IE8-
	} else if (ONREADYSTATECHANGE in createElement('script')) {
	defer = function (id) {
	html.appendChild(createElement('script'))[ONREADYSTATECHANGE] = function () {
	html.removeChild(this);
	run(id);
	};
	};
	// Rest old browsers
	} else {
	defer = function (id) {
	setTimeout(runner(id), 0);
	};
	}
	}

	module.exports = {
	set: set,
	clear: clear
	};

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