From 08f4f3774c26b7604fd7d0161179ba8800068560 Mon Sep 17 00:00:00 2001
From: Ron Buckton <rbuckton@microsoft.com>
Date: Thu, 27 Aug 2015 12:53:17 -0700
Subject: [PATCH] Fixes declaration emit for a class that extends null

---
 src/compiler/declarationEmitter.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/declarationEmitter.ts b/src/compiler/declarationEmitter.ts
index 85513e8719f..e5914d10060 100644
--- a/src/compiler/declarationEmitter.ts
+++ b/src/compiler/declarationEmitter.ts
@@ -896,6 +896,9 @@ namespace ts {
                 if (isSupportedExpressionWithTypeArguments(node)) {
                     emitTypeWithNewGetSymbolAccessibilityDiagnostic(node, getHeritageClauseVisibilityError);
                 }
+                else if (!isImplementsList && node.expression.kind === SyntaxKind.NullKeyword) {
+                    write("null");
+                }
 
                 function getHeritageClauseVisibilityError(symbolAccesibilityResult: SymbolAccessiblityResult): SymbolAccessibilityDiagnostic {
                     let diagnosticMessage: DiagnosticMessage;