react app

react-app/node_modules/core-js/modules/$.microtask.js

@@ -0,0 +1,64 @@
+var global    = require('./$.global')
+  , macrotask = require('./$.task').set
+  , Observer  = global.MutationObserver || global.WebKitMutationObserver
+  , process   = global.process
+  , Promise   = global.Promise
+  , isNode    = require('./$.cof')(process) == 'process'
+  , head, last, notify;
+
+var flush = function(){
+  var parent, domain, fn;
+  if(isNode && (parent = process.domain)){
+    process.domain = null;
+    parent.exit();
+  }
+  while(head){
+    domain = head.domain;
+    fn     = head.fn;
+    if(domain)domain.enter();
+    fn(); // <- currently we use it only for Promise - try / catch not required
+    if(domain)domain.exit();
+    head = head.next;
+  } last = undefined;
+  if(parent)parent.enter();
+};
+
+// Node.js
+if(isNode){
+  notify = function(){
+    process.nextTick(flush);
+  };
+// browsers with MutationObserver
+} else if(Observer){
+  var toggle = 1
+    , 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){
+  notify = function(){
+    Promise.resolve().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);
+  };
+}
+
+module.exports = function asap(fn){
+  var task = {fn: fn, next: undefined, domain: isNode && process.domain};
+  if(last)last.next = task;
+  if(!head){
+    head = task;
+    notify();
+  } last = task;
+};