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diff --git a/node_modules/object-keys/index.js b/node_modules/object-keys/index.js
new file mode 100644
index 0000000..a43807d
--- /dev/null
+++ b/node_modules/object-keys/index.js
@@ -0,0 +1,32 @@
+'use strict';
+
+var slice = Array.prototype.slice;
+var isArgs = require('./isArguments');
+
+var origKeys = Object.keys;
+var keysShim = origKeys ? function keys(o) { return origKeys(o); } : require('./implementation');
+
+var originalKeys = Object.keys;
+
+keysShim.shim = function shimObjectKeys() {
+ if (Object.keys) {
+ var keysWorksWithArguments = (function () {
+ // Safari 5.0 bug
+ var args = Object.keys(arguments);
+ return args && args.length === arguments.length;
+ }(1, 2));
+ if (!keysWorksWithArguments) {
+ Object.keys = function keys(object) { // eslint-disable-line func-name-matching
+ if (isArgs(object)) {
+ return originalKeys(slice.call(object));
+ }
+ return originalKeys(object);
+ };
+ }
+ } else {
+ Object.keys = keysShim;
+ }
+ return Object.keys || keysShim;
+};
+
+module.exports = keysShim;