69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
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var global = require('./_global');
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var macrotask = require('./_task').set;
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var Observer = global.MutationObserver || global.WebKitMutationObserver;
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var process = global.process;
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var Promise = global.Promise;
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var isNode = require('./_cof')(process) == 'process';
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module.exports = function () {
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var head, last, notify;
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var flush = function () {
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var parent, fn;
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if (isNode && (parent = process.domain)) parent.exit();
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while (head) {
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fn = head.fn;
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head = head.next;
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try {
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fn();
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} catch (e) {
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if (head) notify();
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else last = undefined;
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throw e;
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}
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} last = undefined;
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if (parent) parent.enter();
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};
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// Node.js
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if (isNode) {
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notify = function () {
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process.nextTick(flush);
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};
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// browsers with MutationObserver
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} else if (Observer) {
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var toggle = true;
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var node = document.createTextNode('');
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new Observer(flush).observe(node, { characterData: true }); // eslint-disable-line no-new
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notify = function () {
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node.data = toggle = !toggle;
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};
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// environments with maybe non-completely correct, but existent Promise
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} else if (Promise && Promise.resolve) {
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var promise = Promise.resolve();
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notify = function () {
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promise.then(flush);
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};
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// for other environments - macrotask based on:
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// - setImmediate
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// - MessageChannel
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// - window.postMessag
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// - onreadystatechange
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// - setTimeout
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} else {
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notify = function () {
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// strange IE + webpack dev server bug - use .call(global)
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macrotask.call(global, flush);
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};
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}
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return function (fn) {
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var task = { fn: fn, next: undefined };
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if (last) last.next = task;
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if (!head) {
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head = task;
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notify();
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} last = task;
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};
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};
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