From 498a3274b8f22c39f7683f9452f7a06afde5d02c Mon Sep 17 00:00:00 2001
From: Cyrus Najmabadi <cyrusn@microsoft.com>
Date: Wed, 26 Nov 2014 01:06:10 -0800
Subject: [PATCH] Emit modules that contain only const enums, if the
 preserveConstEnum flag is provided.

---
 src/compiler/emitter.ts | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 5cdf98aa63e..11ecd3a37b8 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -715,7 +715,7 @@ module ts {
                 };
             }
         }
-
+
         function emitEnumDeclaration(node: EnumDeclaration) {
             if (resolver.isDeclarationVisible(node)) {
                 emitJsDocComments(node);
@@ -3176,7 +3176,10 @@ module ts {
             }
 
             function emitModuleDeclaration(node: ModuleDeclaration) {
-                if (getModuleInstanceState(node) !== ModuleInstanceState.Instantiated) {
+                var shouldEmit = getModuleInstanceState(node) === ModuleInstanceState.Instantiated ||
+                    (getModuleInstanceState(node) === ModuleInstanceState.ConstEnumOnly && compilerOptions.preserveConstEnums);
+
+                if (!shouldEmit) {
                     return emitPinnedOrTripleSlashComments(node);
                 }
                 emitLeadingComments(node);
@@ -3558,7 +3561,7 @@ module ts {
                 return leadingComments;
             }
 
-
+
             function getLeadingCommentsToEmit(node: Node) {
                 // Emit the leading comments only if the parent's pos doesn't match because parent should take care of emitting these comments
                 if (node.parent.kind === SyntaxKind.SourceFile || node.pos !== node.parent.pos) {