From 3aeae55fc3e7733a2fc667d90ee26010b4bbc46c Mon Sep 17 00:00:00 2001
From: Dick van den Brink <d_vandenbrink@outlook.com>
Date: Thu, 30 Apr 2015 17:53:39 +0200
Subject: [PATCH] Output abstract keyword in declaration files (for classes)

---
 src/compiler/declarationEmitter.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/declarationEmitter.ts b/src/compiler/declarationEmitter.ts
index 5c705f18190..3082c12e2d6 100644
--- a/src/compiler/declarationEmitter.ts
+++ b/src/compiler/declarationEmitter.ts
@@ -908,6 +908,10 @@ module ts {
 
             emitJsDocComments(node);
             emitModuleElementDeclarationFlags(node);
+            if (node.flags & NodeFlags.Abstract) {
+                write("abstract ");
+            }
+
             write("class ");
             writeTextOfNode(currentSourceFile, node.name);
             let prevEnclosingDeclaration = enclosingDeclaration;