allow XJSElement and SequenceExpression to be user whitespacable

lib/6to5/generation/node/index.js

@@ -24,17 +24,14 @@ function Node(node, parent) {
 }
 
 Node.prototype.isUserWhitespacable = function () {
-  //var parent = this.parent;
+  var parent = this.parent;
   var node = this.node;
 
-  if (t.isUserWhitespacable(node)) {
+  if (t.isUserWhitespacable(node) ||
+      t.isSequenceExpression(parent)) {
     return true;
   }
 
-  //if (t.isArrayExpression(parent)) {
-  //  return true;
-  //}
-
   return false;
 };
 

lib/6to5/types/alias-keys.json

@@ -42,5 +42,6 @@
   "ObjectPattern": ["Pattern"],
   "ArrayPattern":  ["Pattern"],
 
-  "Property": ["UserWhitespacable"]
+  "Property": ["UserWhitespacable"],
+  "XJSElement": ["UserWhitespacable"]
 }