64 lines
1.7 KiB
JavaScript
64 lines
1.7 KiB
JavaScript
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var global = require('./$.global')
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, macrotask = require('./$.task').set
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, Observer = global.MutationObserver || global.WebKitMutationObserver
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, process = global.process
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, Promise = global.Promise
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, isNode = require('./$.cof')(process) == 'process'
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, head, last, notify;
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var flush = function(){
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var parent, domain, fn;
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if(isNode && (parent = process.domain)){
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process.domain = null;
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parent.exit();
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}
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while(head){
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domain = head.domain;
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fn = head.fn;
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if(domain)domain.enter();
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fn(); // <- currently we use it only for Promise - try / catch not required
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if(domain)domain.exit();
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head = head.next;
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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 = 1
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, 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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notify = function(){
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Promise.resolve().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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module.exports = function asap(fn){
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var task = {fn: fn, next: undefined, domain: isNode && process.domain};
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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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