From 6ae0cd881edac60d7b8b88f6068b0a62c193c211 Mon Sep 17 00:00:00 2001
From: Andy Hanson <anhans@microsoft.com>
Date: Thu, 11 Oct 2018 14:50:07 -0700
Subject: [PATCH] Simplify hasExportDeclarations

---
 src/compiler/binder.ts | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index 292bfe51340db..2f9921543ddb5 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -1569,15 +1569,8 @@ namespace ts {
         }
 
         function hasExportDeclarations(node: ModuleDeclaration | SourceFile): boolean {
-            const body = node.kind === SyntaxKind.SourceFile ? node : node.body;
-            if (body && (body.kind === SyntaxKind.SourceFile || body.kind === SyntaxKind.ModuleBlock)) {
-                for (const stat of (<BlockLike>body).statements) {
-                    if (stat.kind === SyntaxKind.ExportDeclaration || stat.kind === SyntaxKind.ExportAssignment) {
-                        return true;
-                    }
-                }
-            }
-            return false;
+            const body = isSourceFile(node) ? node : tryCast(node.body, isModuleBlock);
+            return !!body && body.statements.some(s => isExportDeclaration(s) || isExportAssignment(s));
         }
 
         function setExportContextFlag(node: ModuleDeclaration | SourceFile) {