From 01dda944337c13c7ed5dc8ba42785874c06b5dff Mon Sep 17 00:00:00 2001
From: Mohamed Hegazy <mhegazy@microsoft.com>
Date: Tue, 25 Aug 2015 17:44:16 -0700
Subject: [PATCH] Only set files if we have one

---
 src/compiler/tsc.ts | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/compiler/tsc.ts b/src/compiler/tsc.ts
index e2bf12a832..31a22a5dd6 100644
--- a/src/compiler/tsc.ts
+++ b/src/compiler/tsc.ts
@@ -503,12 +503,16 @@ namespace ts {
         }
         else {
             let compilerOptions = extend(options, defaultInitCompilerOptions);
-            let configs = {
+            let configs: any = {
                 compilerOptions: serializeCompilerOptions(compilerOptions),
-                files: fileNames,
-                exclude: ["node_modules"],
+                exclude: ["node_modules"]
             };
 
+            if (fileNames && fileNames.length) {
+                // only set the files property if we have at least one file
+                configs.files = fileNames;
+            }
+
             sys.writeFile(file, JSON.stringify(configs, undefined, 4));
             reportDiagnostic(createCompilerDiagnostic(Diagnostics.Successfully_created_a_tsconfig_json_file));
         }