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diff --git a/node_modules/uncss/node_modules/form-data/node_modules/lodash/_mapCacheDelete.js b/node_modules/uncss/node_modules/form-data/node_modules/lodash/_mapCacheDelete.js
new file mode 100644
index 000000000..946ca3c93
--- /dev/null
+++ b/node_modules/uncss/node_modules/form-data/node_modules/lodash/_mapCacheDelete.js
@@ -0,0 +1,18 @@
+var getMapData = require('./_getMapData');
+
+/**
+ * Removes `key` and its value from the map.
+ *
+ * @private
+ * @name delete
+ * @memberOf MapCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+function mapCacheDelete(key) {
+  var result = getMapData(this, key)['delete'](key);
+  this.size -= result ? 1 : 0;
+  return result;
+}
+
+module.exports = mapCacheDelete;