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diff --git a/node_modules/core-js/modules/_microtask.js b/node_modules/core-js/modules/_microtask.js
new file mode 100644
index 000000000..b0f2a0df0
--- /dev/null
+++ b/node_modules/core-js/modules/_microtask.js
@@ -0,0 +1,68 @@
+var global    = require('./_global')
+  , macrotask = require('./_task').set
+  , Observer  = global.MutationObserver || global.WebKitMutationObserver
+  , process   = global.process
+  , Promise   = global.Promise
+  , 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
+  } else if(Observer){
+    var toggle = true
+      , 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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