From 08c78fbe76d87d0e15ca67ac106583e9687ff9cb Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Thu, 8 Oct 2015 16:39:53 -0700
Subject: [PATCH] Check for ClassDeclaration in getBaseTypeNodeOfClass

Previously, it just used valueDeclaration. Now, it searches the
declarations.
---
 src/compiler/checker.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 551f428ca9a..86754ff93d0 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -2766,7 +2766,10 @@ namespace ts {
         }
 
         function getBaseTypeNodeOfClass(type: InterfaceType): ExpressionWithTypeArguments {
-            return getClassExtendsHeritageClauseElement(<ClassLikeDeclaration>type.symbol.valueDeclaration);
+            let classDeclaration = getDeclarationOfKind(type.symbol, SyntaxKind.ClassDeclaration);
+            if (classDeclaration) {
+                return getClassExtendsHeritageClauseElement(classDeclaration as ClassLikeDeclaration);
+            }
         }
 
         function getConstructorsForTypeArguments(type: ObjectType, typeArgumentNodes: TypeNode[]): Signature[] {