From 62c5bda3bbc1ee06d6ed0a575274da3159004f52 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <nathansa@microsoft.com>
Date: Wed, 28 Sep 2016 14:14:53 -0700
Subject: [PATCH] isDeclaredProperty: Use optional-boolean idiom

As elsewhere in the compiler code
---
 src/compiler/types.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 0e120bd74f0..7a98efd007f 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2536,7 +2536,7 @@ namespace ts {
 
     /* @internal */
     export interface SpreadElementType extends ResolvedType {
-        isDeclaredProperty: boolean | undefined;
+        isDeclaredProperty?: boolean;
     }
 
     /* @internal */