From 3de310af066b852008b0462fd271d4357970bf3e Mon Sep 17 00:00:00 2001
From: Vladimir Matveev <vladima@microsoft.com>
Date: Wed, 13 Apr 2016 15:14:35 -0700
Subject: [PATCH] emit 'export *' for es6 only if module exports some value

---
 src/compiler/transformers/module/es6.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/transformers/module/es6.ts b/src/compiler/transformers/module/es6.ts
index d2f4ca4f224..742f208d61c 100644
--- a/src/compiler/transformers/module/es6.ts
+++ b/src/compiler/transformers/module/es6.ts
@@ -55,7 +55,7 @@ namespace ts {
 
         function visitExportDeclaration(node: ExportDeclaration): ExportDeclaration {
             if (!node.exportClause) {
-                return node; // export * is always emitted
+                return resolver.moduleExportsSomeValue(node.moduleSpecifier) ? node : undefined;
             }
             if (!resolver.isValueAliasDeclaration(node)) {
                 return undefined;