i made the javascripts faster with a transformer prepass to check what transformers actually have to be ran

lib/6to5/traverse/scope.js

@@ -35,6 +35,18 @@ function Scope(block, parentBlock, parent, file) {
 
 Scope.defaultDeclarations = flatten([globals.builtin, globals.browser, globals.node].map(Object.keys));
 
+/**
+ * Description
+ *
+ * @param {Object} node
+ * @param {Object} opts
+ * @param [state]
+ */
+
+Scope.prototype.traverse = function (node, opts, state) {
+  traverse(node, opts, this, state);
+};
+
 /**
  * Description
  *