From 440d01f0bde14d13cc2ca054439caaadcb5009ac Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Fri, 9 Oct 2015 10:12:17 -0700
Subject: [PATCH] Fall back to valueDeclaration

Fall back to `valueDeclaration` in getBaseTypeNodeOfClass when no
ClassDeclaration exists.
---
 src/compiler/checker.ts | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 86754ff93d0..6c233a57ef4 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -2766,10 +2766,9 @@ namespace ts {
         }
 
         function getBaseTypeNodeOfClass(type: InterfaceType): ExpressionWithTypeArguments {
-            let classDeclaration = getDeclarationOfKind(type.symbol, SyntaxKind.ClassDeclaration);
-            if (classDeclaration) {
-                return getClassExtendsHeritageClauseElement(classDeclaration as ClassLikeDeclaration);
-            }
+            let classDeclaration =
+                getDeclarationOfKind(type.symbol, SyntaxKind.ClassDeclaration) || type.symbol.valueDeclaration;
+            return getClassExtendsHeritageClauseElement(classDeclaration as ClassLikeDeclaration);
         }
 
         function getConstructorsForTypeArguments(type: ObjectType, typeArgumentNodes: TypeNode[]): Signature[] {