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var global = require('./_global');
var macrotask = require('./_task').set;
var Observer = global.MutationObserver || global.WebKitMutationObserver;
var process = global.process;
var Promise = global.Promise;
var isNode = require('./_cof')(process) == 'process';
module.exports = function () {
var head, last, notify;
var flush = function () {
var parent, fn;
if (isNode && (parent = process.domain)) parent.exit();
while (head) {
fn = head.fn;
head = head.next;
try {
fn();
} catch (e) {
if (head) notify();
else last = undefined;
throw e;
}
} last = undefined;
if (parent) parent.enter();
};
// Node.js
if (isNode) {
notify = function () {
process.nextTick(flush);
};
// browsers with MutationObserver, except iOS Safari - https://github.com/zloirock/core-js/issues/339
} else if (Observer && !(global.navigator && global.navigator.standalone)) {
var toggle = true;
var node = document.createTextNode('');
new Observer(flush).observe(node, { characterData: true }); // eslint-disable-line no-new
notify = function () {
node.data = toggle = !toggle;
};
// environments with maybe non-completely correct, but existent Promise
} else if (Promise && Promise.resolve) {
var promise = Promise.resolve();
notify = function () {
promise.then(flush);
};
// for other environments - macrotask based on:
// - setImmediate
// - MessageChannel
// - window.postMessag
// - onreadystatechange
// - setTimeout
} else {
notify = function () {
// strange IE + webpack dev server bug - use .call(global)
macrotask.call(global, flush);
};
}
return function (fn) {
var task = { fn: fn, next: undefined };
if (last) last.next = task;
if (!head) {
head = task;
notify();
} last = task;
};
};
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