From 97df079feb40d05faa476ead394d256349b6011f Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Mon, 30 Apr 2018 17:05:22 -0700
Subject: [PATCH] PR feedback

---
 src/compiler/checker.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index f17ecf924a6..5a846cb8d14 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -4685,8 +4685,8 @@ namespace ts {
                     return links.type = anyType;
                 }
                 // Handle export default expressions
-                if (declaration.kind === SyntaxKind.SourceFile) {
-                    Debug.assert(isJsonSourceFile(declaration as SourceFile));
+                if (isSourceFile(declaration)) {
+                    Debug.assert(isJsonSourceFile(declaration));
                     const jsonSourceFile = <JsonSourceFile>declaration;
                     return links.type = jsonSourceFile.statements.length ? checkExpression(jsonSourceFile.statements[0].expression) : emptyObjectType;
                 }