From 370fb95b215ee9c092950cb17efa7a2858e57598 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Tue, 20 May 2025 13:46:32 -0700
Subject: [PATCH] Look for source of dts file only if dts is not from
 node_modules unless we have project references in node_modules

---
 src/compiler/program.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 48d8d07f1641e..932d8a80e88bb 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -1717,6 +1717,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
     let projectReferenceRedirects: Map<Path, ResolvedProjectReference | false> | undefined;
     let mapFromFileToProjectReferenceRedirects: Map<Path, Path> | undefined;
     let mapFromToProjectReferenceRedirectSource: Map<Path, SourceOfProjectReferenceRedirect> | undefined;
+    let hasResolvedReferencencesInNodeModules = false;
 
     const useSourceOfProjectReferenceRedirect = !!host.useSourceOfProjectReferenceRedirect?.() &&
         !options.disableSourceOfProjectReferenceRedirect;
@@ -3823,6 +3824,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
 
     function getSourceOfProjectReferenceRedirect(path: Path) {
         if (!isDeclarationFileName(path)) return undefined;
+        if (!hasResolvedReferencencesInNodeModules && pathContainsNodeModules(path)) return undefined;
         if (mapFromToProjectReferenceRedirectSource === undefined) {
             mapFromToProjectReferenceRedirectSource = new Map();
             forEachResolvedProjectReference(resolvedRef => {
@@ -4140,6 +4142,9 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
         sourceFile.path = sourceFilePath;
         sourceFile.resolvedPath = sourceFilePath;
         sourceFile.originalFileName = refPath;
+        if (!hasResolvedReferencencesInNodeModules && (pathContainsNodeModules(sourceFile.resolvedPath) || pathContainsNodeModules(sourceFile.path))) {
+            hasResolvedReferencencesInNodeModules = true;
+        }
 
         const resolvedRef: ResolvedProjectReference = { commandLine, sourceFile };
         projectReferenceRedirects.set(sourceFilePath, resolvedRef);