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- "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");
- };
- var NativePromise = util.getNativePromise();
- 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 NativePromise === "function" &&
- typeof NativePromise.resolve === "function") {
- var nativePromise = NativePromise.resolve();
- schedule = function(fn) {
- nativePromise.then(fn);
- };
- } else if ((typeof MutationObserver !== "undefined") &&
- !(typeof window !== "undefined" &&
- window.navigator &&
- (window.navigator.standalone || window.cordova))) {
- 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;
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