57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
"use strict"
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/**
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* This is modeled after Bluebird's scheduler. It solves for quite a few edge
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* cases, and should help alleviate most of the flakiness issues. It also speeds
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* up the suite a bit.
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*/
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module.exports = (function () {
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// The scheduler for NodeJS/io.js is setImmediate for recent versions of
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// node because of macrotask semantics (i.e. don't starve the event loop).
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if (typeof process !== "undefined" &&
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/^\[object process\]/i.test({}.toString.call(process))) {
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var version = process.versions.node.split(".").map(Number)
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var isRecent = version[0] === 0 && version[1] > 10 || version[0] > 0
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return isRecent ? setImmediate : process.nextTick
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}
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if (typeof Promise === "function") {
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var p = Promise.resolve()
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return function (fn) {
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p.then(fn)
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}
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}
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if (typeof MutationObserver !== "undefined") {
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// Using 2 mutation observers to batch multiple updates into one.
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var div = document.createElement("div")
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var opts = {attributes: true}
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var toggleScheduled = false
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var div2 = document.createElement("div")
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var o2 = new MutationObserver(function() {
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div.classList.toggle("foo")
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toggleScheduled = false
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})
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o2.observe(div2, opts)
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function scheduleToggle() {
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if (toggleScheduled) return
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toggleScheduled = true
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div2.classList.toggle("foo")
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}
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return function (fn) {
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var o = new MutationObserver(function() {
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o.disconnect()
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fn()
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})
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o.observe(div, opts)
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scheduleToggle()
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}
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}
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return typeof setImmediate === "function" ? setImmediate : setTimeout
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})()
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