pass scope to transformers

lib/6to5/transformer.js

@@ -35,7 +35,7 @@ Transformer.prototype.transform = function (file) {
   var self = this;
 
   var build = function (exit) {
-    return function (node, parent) {
+    return function (node, parent, opts) {
       // add any node type aliases that exist
       var types = [node.type].concat(t.ALIAS_KEYS[node.type] || []);
 
@@ -52,7 +52,7 @@ Transformer.prototype.transform = function (file) {
       if (exit) fn = fns.exit;
       if (!fn) return;
 
-      return fn(node, parent, file);
+      return fn(node, parent, file, opts.scope);
     };
   };