From 1fc6675a2973b2ad361ab3bf4c946bc48baeeb95 Mon Sep 17 00:00:00 2001
From: uniqueiniquity <blichtman623@gmail.com>
Date: Wed, 6 Dec 2017 14:40:59 -0800
Subject: [PATCH] Allow for undefined return from TypeCheckerHost.getSourceFile
 to correspond with implementation

---
 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 f6ca2f45d34..6ab0f5543ec 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2736,7 +2736,7 @@ namespace ts {
         getCompilerOptions(): CompilerOptions;
 
         getSourceFiles(): ReadonlyArray<SourceFile>;
-        getSourceFile(fileName: string): SourceFile;
+        getSourceFile(fileName: string): SourceFile | undefined;
         getResolvedTypeReferenceDirectives(): ReadonlyMap<ResolvedTypeReferenceDirective>;
     }