implement new and improved let scoping - fixes #91, fixes #102, fixes #124

lib/6to5/types/index.js

@@ -94,15 +94,15 @@ t.toBlock = function (node, parent) {
   return t.blockStatement(node);
 };
 
-t.getIds = function (node) {
+t.getIds = function (node, map) {
   var search = [node];
-  var ids  = [];
+  var ids    = {};
 
   while (search.length) {
     var id = search.shift();
 
     if (t.isIdentifier(id)) {
-      ids.push(id.name);
+      ids[id.name] = id;
     } else if (t.isArrayPattern(id)) {
       _.each(id.elements, function (elem) {
         search.push(elem);
@@ -122,6 +122,7 @@ t.getIds = function (node) {
     }
   }
 
+  if (!map) ids = _.keys(ids);
   return ids;
 };