[6a3a178] | 1 | var global = require('../internals/global');
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| 2 | var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
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| 3 | var macrotask = require('../internals/task').set;
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| 4 | var IS_IOS = require('../internals/engine-is-ios');
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| 5 | var IS_WEBOS_WEBKIT = require('../internals/engine-is-webos-webkit');
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| 6 | var IS_NODE = require('../internals/engine-is-node');
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| 7 |
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| 8 | var MutationObserver = global.MutationObserver || global.WebKitMutationObserver;
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| 9 | var document = global.document;
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| 10 | var process = global.process;
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| 11 | var Promise = global.Promise;
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| 12 | // Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`
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| 13 | var queueMicrotaskDescriptor = getOwnPropertyDescriptor(global, 'queueMicrotask');
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| 14 | var queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;
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| 15 |
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| 16 | var flush, head, last, notify, toggle, node, promise, then;
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| 17 |
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| 18 | // modern engines have queueMicrotask method
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| 19 | if (!queueMicrotask) {
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| 20 | flush = function () {
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| 21 | var parent, fn;
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| 22 | if (IS_NODE && (parent = process.domain)) parent.exit();
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| 23 | while (head) {
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| 24 | fn = head.fn;
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| 25 | head = head.next;
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| 26 | try {
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| 27 | fn();
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| 28 | } catch (error) {
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| 29 | if (head) notify();
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| 30 | else last = undefined;
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| 31 | throw error;
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| 32 | }
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| 33 | } last = undefined;
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| 34 | if (parent) parent.enter();
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| 35 | };
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| 36 |
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| 37 | // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
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| 38 | // also except WebOS Webkit https://github.com/zloirock/core-js/issues/898
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| 39 | if (!IS_IOS && !IS_NODE && !IS_WEBOS_WEBKIT && MutationObserver && document) {
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| 40 | toggle = true;
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| 41 | node = document.createTextNode('');
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| 42 | new MutationObserver(flush).observe(node, { characterData: true });
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| 43 | notify = function () {
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| 44 | node.data = toggle = !toggle;
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| 45 | };
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| 46 | // environments with maybe non-completely correct, but existent Promise
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| 47 | } else if (Promise && Promise.resolve) {
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| 48 | // Promise.resolve without an argument throws an error in LG WebOS 2
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| 49 | promise = Promise.resolve(undefined);
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| 50 | // workaround of WebKit ~ iOS Safari 10.1 bug
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| 51 | promise.constructor = Promise;
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| 52 | then = promise.then;
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| 53 | notify = function () {
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| 54 | then.call(promise, flush);
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| 55 | };
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| 56 | // Node.js without promises
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| 57 | } else if (IS_NODE) {
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| 58 | notify = function () {
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| 59 | process.nextTick(flush);
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| 60 | };
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| 61 | // for other environments - macrotask based on:
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| 62 | // - setImmediate
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| 63 | // - MessageChannel
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| 64 | // - window.postMessag
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| 65 | // - onreadystatechange
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| 66 | // - setTimeout
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| 67 | } else {
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| 68 | notify = function () {
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| 69 | // strange IE + webpack dev server bug - use .call(global)
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| 70 | macrotask.call(global, flush);
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| 71 | };
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| 72 | }
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| 73 | }
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| 74 |
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| 75 | module.exports = queueMicrotask || function (fn) {
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| 76 | var task = { fn: fn, next: undefined };
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| 77 | if (last) last.next = task;
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| 78 | if (!head) {
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| 79 | head = task;
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| 80 | notify();
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| 81 | } last = task;
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| 82 | };
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