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diff --git a/node_modules/grunt-uncss/node_modules/lodash/_stackHas.js b/node_modules/grunt-uncss/node_modules/lodash/_stackHas.js
new file mode 100644
index 000000000..16a3ad11b
--- /dev/null
+++ b/node_modules/grunt-uncss/node_modules/lodash/_stackHas.js
@@ -0,0 +1,14 @@
+/**
+ * Checks if a stack value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf Stack
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+function stackHas(key) {
+  return this.__data__.has(key);
+}
+
+module.exports = stackHas;