--- /dev/null
+"use strict";
+var util = require("./util");
+var schedule;
+var noAsyncScheduler = function() {
+ throw new Error("No async scheduler available\u000a\u000a See http://goo.gl/MqrFmX\u000a");
+};
+if (util.isNode && typeof MutationObserver === "undefined") {
+ var GlobalSetImmediate = global.setImmediate;
+ var ProcessNextTick = process.nextTick;
+ schedule = util.isRecentNode
+ ? function(fn) { GlobalSetImmediate.call(global, fn); }
+ : function(fn) { ProcessNextTick.call(process, fn); };
+} else if ((typeof MutationObserver !== "undefined") &&
+ !(typeof window !== "undefined" &&
+ window.navigator &&
+ window.navigator.standalone)) {
+ schedule = (function() {
+ var div = document.createElement("div");
+ var opts = {attributes: true};
+ var toggleScheduled = false;
+ var div2 = document.createElement("div");
+ var o2 = new MutationObserver(function() {
+ div.classList.toggle("foo");
+ toggleScheduled = false;
+ });
+ o2.observe(div2, opts);
+
+ var scheduleToggle = function() {
+ if (toggleScheduled) return;
+ toggleScheduled = true;
+ div2.classList.toggle("foo");
+ };
+
+ return function schedule(fn) {
+ var o = new MutationObserver(function() {
+ o.disconnect();
+ fn();
+ });
+ o.observe(div, opts);
+ scheduleToggle();
+ };
+ })();
+} else if (typeof setImmediate !== "undefined") {
+ schedule = function (fn) {
+ setImmediate(fn);
+ };
+} else if (typeof setTimeout !== "undefined") {
+ schedule = function (fn) {
+ setTimeout(fn, 0);
+ };
+} else {
+ schedule = noAsyncScheduler;
+}
+module.exports = schedule;