From ecf875112b7a7faea715a60ac1ee4da8c201bb38 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Fri, 21 Jun 2019 14:22:11 -0700
Subject: [PATCH] Check for language serivice enabled when including source
 files

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

diff --git a/src/server/project.ts b/src/server/project.ts
index 3e69a78551..3b721c14b5 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -1427,12 +1427,12 @@ namespace ts.server {
 
         /* @internal */
         useSourceInsteadOfReferenceRedirect() {
-            return true;
+            return !!this.languageServiceEnabled;
         }
 
         fileExists(file: string): boolean {
             // Project references go to source file instead of .d.ts file
-            if (this.getSourceOfProjectReferenceRedirect) {
+            if (this.languageServiceEnabled && this.getSourceOfProjectReferenceRedirect) {
                 const source = this.getSourceOfProjectReferenceRedirect(file);
                 if (source) return isString(source) ? super.fileExists(source) : true;
             }