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diff --git a/node_modules/grunt-uncss/node_modules/lodash/_copyObject.js b/node_modules/grunt-uncss/node_modules/lodash/_copyObject.js
new file mode 100644
index 000000000..2f2a5c23b
--- /dev/null
+++ b/node_modules/grunt-uncss/node_modules/lodash/_copyObject.js
@@ -0,0 +1,40 @@
+var assignValue = require('./_assignValue'),
+    baseAssignValue = require('./_baseAssignValue');
+
+/**
+ * Copies properties of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property identifiers to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @param {Function} [customizer] The function to customize copied values.
+ * @returns {Object} Returns `object`.
+ */
+function copyObject(source, props, object, customizer) {
+  var isNew = !object;
+  object || (object = {});
+
+  var index = -1,
+      length = props.length;
+
+  while (++index < length) {
+    var key = props[index];
+
+    var newValue = customizer
+      ? customizer(object[key], source[key], key, object, source)
+      : undefined;
+
+    if (newValue === undefined) {
+      newValue = source[key];
+    }
+    if (isNew) {
+      baseAssignValue(object, key, newValue);
+    } else {
+      assignValue(object, key, newValue);
+    }
+  }
+  return object;
+}
+
+module.exports = copyObject;