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diff --git a/node_modules/core-js/library/modules/_task.js b/node_modules/core-js/library/modules/_task.js
new file mode 100644
index 000000000..06a73f40c
--- /dev/null
+++ b/node_modules/core-js/library/modules/_task.js
@@ -0,0 +1,75 @@
+var ctx                = require('./_ctx')
+  , invoke             = require('./_invoke')
+  , html               = require('./_html')
+  , cel                = require('./_dom-create')
+  , global             = require('./_global')
+  , process            = global.process
+  , setTask            = global.setImmediate
+  , clearTask          = global.clearImmediate
+  , MessageChannel     = global.MessageChannel
+  , counter            = 0
+  , queue              = {}
+  , ONREADYSTATECHANGE = 'onreadystatechange'
+  , defer, channel, port;
+var run = function(){
+  var id = +this;
+  if(queue.hasOwnProperty(id)){
+    var fn = queue[id];
+    delete queue[id];
+    fn();
+  }
+};
+var listener = function(event){
+  run.call(event.data);
+};
+// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
+if(!setTask || !clearTask){
+  setTask = function setImmediate(fn){
+    var args = [], i = 1;
+    while(arguments.length > i)args.push(arguments[i++]);
+    queue[++counter] = function(){
+      invoke(typeof fn == 'function' ? fn : Function(fn), args);
+    };
+    defer(counter);
+    return counter;
+  };
+  clearTask = function clearImmediate(id){
+    delete queue[id];
+  };
+  // Node.js 0.8-
+  if(require('./_cof')(process) == 'process'){
+    defer = function(id){
+      process.nextTick(ctx(run, id, 1));
+    };
+  // Browsers with MessageChannel, includes WebWorkers
+  } else if(MessageChannel){
+    channel = new MessageChannel;
+    port    = channel.port2;
+    channel.port1.onmessage = listener;
+    defer = ctx(port.postMessage, port, 1);
+  // Browsers with postMessage, skip WebWorkers
+  // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
+  } else if(global.addEventListener && typeof postMessage == 'function' && !global.importScripts){
+    defer = function(id){
+      global.postMessage(id + '', '*');
+    };
+    global.addEventListener('message', listener, false);
+  // IE8-
+  } else if(ONREADYSTATECHANGE in cel('script')){
+    defer = function(id){
+      html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function(){
+        html.removeChild(this);
+        run.call(id);
+      };
+    };
+  // Rest old browsers
+  } else {
+    defer = function(id){
+      setTimeout(ctx(run, id, 1), 0);
+    };
+  }
+}
+module.exports = {
+  set:   setTask,
+  clear: clearTask
+};
\ No newline at end of file