From 1a1c6dd2455812e40a7ae5b61ba5d404bbabc921 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Burzy=C5=84ski?= <mateuszburzynski@gmail.com>
Date: Mon, 27 May 2024 11:24:47 +0200
Subject: [PATCH] Fixed an accidental `undefined` leak into
 `getAccessibleSymbolChain`'s cache key

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

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index a9830b1264457..065608a78664b 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5473,7 +5473,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         const cache = (links.accessibleChainCache ||= new Map());
         // Go from enclosingDeclaration to the first scope we check, so the cache is keyed off the scope and thus shared more
         const firstRelevantLocation = forEachSymbolTableInScope(enclosingDeclaration, (_, __, ___, node) => node);
-        const key = `${useOnlyExternalAliasing ? 0 : 1}|${firstRelevantLocation && getNodeId(firstRelevantLocation)}|${meaning}`;
+        const key = `${useOnlyExternalAliasing ? 0 : 1}|${firstRelevantLocation ? getNodeId(firstRelevantLocation) : 0}|${meaning}`;
         if (cache.has(key)) {
             return cache.get(key);
         }