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1 files changed, 10 insertions, 0 deletions

diff --git a/node_modules/core-js/modules/_keyof.js b/node_modules/core-js/modules/_keyof.js
new file mode 100644
index 00000000..0786096f
--- /dev/null
+++ b/node_modules/core-js/modules/_keyof.js
@@ -0,0 +1,10 @@
+var getKeys = require('./_object-keys');
+var toIObject = require('./_to-iobject');
+module.exports = function (object, el) {
+  var O = toIObject(object);
+  var keys = getKeys(O);
+  var length = keys.length;
+  var index = 0;
+  var key;
+  while (length > index) if (O[key = keys[index++]] === el) return key;
+};