better wildcard imports and exports - fixes #224

lib/6to5/file.js

@@ -34,7 +34,8 @@ File.helpers = [
   "define-property",
   "async-to-generator",
   "interop-require-wildcard",
-  "typeof"
+  "typeof",
+  "exports-wildcard"
 ];
 
 File.excludeHelpersFromRuntime = [

lib/6to5/transformation/modules/_default.js

@@ -162,9 +162,9 @@ DefaultFormatter.prototype._exportSpecifier = function (getRef, specifier, node,
 };
 
 DefaultFormatter.prototype._exportsWildcard = function (objectIdentifier) {
-  return util.template("exports-wildcard", {
-    OBJECT: objectIdentifier
-  }, true);
+  return t.expressionStatement(t.callExpression(this.file.addHelper("exports-wildcard"), [
+    t.callExpression(this.file.addHelper("interop-require-wildcard"), [objectIdentifier])
+  ]));
 };
 
 DefaultFormatter.prototype._exportsAssign = function (id, init) {

lib/6to5/transformation/templates/exports-wildcard.js

@@ -1,5 +1,7 @@
 (function (obj) {
   for (var i in obj) {
-    exports[i] = obj[i];
+    if (exports[i] !== undefined) {
+      exports[i] = obj[i];
+    }
   }
-})(OBJECT);
+})