"use strict";
var schedule;
if (require("./util.js").isNode) {
    var version = process.version.split(".").map(Number);
    schedule = (version[0] === 0 && version[1] > 10) || (version[0] > 0)
        ? global.setImmediate : process.nextTick;
}
else if (typeof MutationObserver !== "undefined") {
    schedule = function(fn) {
        var div = document.createElement("div");
        var observer = new MutationObserver(fn);
        observer.observe(div, {attributes: true});
        return function() { div.classList.toggle("foo"); };
    };
    schedule.isStatic = true;
}
else if (typeof setTimeout !== "undefined") {
    schedule = function (fn) {
        setTimeout(fn, 0);
    };
}
else {
    schedule = function() {
        throw new Error("No async scheduler available\u000a\u000a    See http://goo.gl/m3OTXk\u000a");
    };
}
module.exports = schedule;