From 70069aeb3149e7473ce5db7bbe9ef87ba6edaac0 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Thu, 8 Jun 2017 14:15:24 -0700
Subject: [PATCH] hasExcessProperty only uses valueDeclaration if available

Previously it would crash if valueDeclaration was not set
---
 src/compiler/checker.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 266fbe573be..7ec1a0ae2b2 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -8977,7 +8977,9 @@ namespace ts {
                                     reportError(Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(prop), typeToString(target));
                                 }
                                 else {
-                                    errorNode = prop.valueDeclaration;
+                                    if (prop.valueDeclaration) {
+                                        errorNode = prop.valueDeclaration;
+                                    }
                                     reportError(Diagnostics.Object_literal_may_only_specify_known_properties_and_0_does_not_exist_in_type_1,
                                         symbolToString(prop), typeToString(target));
                                 }