1 files changed, 10 insertions, 0 deletions
diff --git a/node_modules/core-js/library/modules/_keyof.js b/node_modules/core-js/library/modules/_keyof.js
new file mode 100644
index 000000000..7b63229b0
--- /dev/null
+++ b/node_modules/core-js/library/modules/_keyof.js
@@ -0,0 +1,10 @@
+var getKeys   = require('./_object-keys')
+  , toIObject = require('./_to-iobject');
+module.exports = function(object, el){
+  var O      = toIObject(object)
+    , keys   = getKeys(O)
+    , length = keys.length
+    , index  = 0
+    , key;
+  while(length > index)if(O[key = keys[index++]] === el)return key;
+};
+\ No newline at end of file