From 3458360322a2d84d4512fd136bc39210e233623d Mon Sep 17 00:00:00 2001
From: Andy <anhans@microsoft.com>
Date: Tue, 30 Oct 2018 16:38:52 -0700
Subject: [PATCH] Prefer getValidSourceFile over
 Debug.assertDefined(program.getSourceFile(*)) (#28242)

---
 src/services/services.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/services.ts b/src/services/services.ts
index a91836e6687..4367bd11985 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1533,7 +1533,7 @@ namespace ts {
             const normalizedFileName = normalizePath(fileName);
             Debug.assert(filesToSearch.some(f => normalizePath(f) === normalizedFileName));
             synchronizeHostData();
-            const sourceFilesToSearch = map(filesToSearch, f => Debug.assertDefined(program.getSourceFile(f)));
+            const sourceFilesToSearch = filesToSearch.map(getValidSourceFile);
             const sourceFile = getValidSourceFile(fileName);
             return DocumentHighlights.getDocumentHighlights(program, cancellationToken, sourceFile, position, sourceFilesToSearch);
         }