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68 lines
1.7 KiB
JavaScript
68 lines
1.7 KiB
JavaScript
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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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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, 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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}; |