--- /dev/null
+var global = require('../internals/global');
+var fails = require('../internals/fails');
+var classof = require('../internals/classof-raw');
+var bind = require('../internals/function-bind-context');
+var html = require('../internals/html');
+var createElement = require('../internals/document-create-element');
+var IS_IOS = require('../internals/engine-is-ios');
+
+var location = global.location;
+var set = global.setImmediate;
+var clear = global.clearImmediate;
+var process = global.process;
+var MessageChannel = global.MessageChannel;
+var Dispatch = global.Dispatch;
+var counter = 0;
+var queue = {};
+var ONREADYSTATECHANGE = 'onreadystatechange';
+var defer, channel, port;
+
+var run = function (id) {
+ // eslint-disable-next-line no-prototype-builtins
+ if (queue.hasOwnProperty(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(id + '', location.protocol + '//' + location.host);
+};
+
+// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
+if (!set || !clear) {
+ set = function setImmediate(fn) {
+ var args = [];
+ var i = 1;
+ while (arguments.length > i) args.push(arguments[i++]);
+ queue[++counter] = function () {
+ // eslint-disable-next-line no-new-func
+ (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);
+ };
+ defer(counter);
+ return counter;
+ };
+ clear = function clearImmediate(id) {
+ delete queue[id];
+ };
+ // Node.js 0.8-
+ if (classof(process) == 'process') {
+ 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, 1);
+ // Browsers with postMessage, skip WebWorkers
+ // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
+ } else if (
+ global.addEventListener &&
+ typeof postMessage == 'function' &&
+ !global.importScripts &&
+ !fails(post) &&
+ location.protocol !== 'file:'
+ ) {
+ 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
+};