♻️ Make additionalPatterns null by default

Author: KyleRoss

lib/modclean.js

@@ -34,9 +34,9 @@ let defaults = {
     patterns:   ['default:safe'],
     /**
      * Array of additional patterns to use.
-     * @type {Array}
+     * @type {?Array}
      */
-    additionalPatterns: [],
+    additionalPatterns: null,
     /**
      * Ignore the provided glob patterns
      * @type {?Array}