From b33d37201e8f0353f69406d9872955dd4ccb9c34 Mon Sep 17 00:00:00 2001
From: Jake Bailey <5341706+jakebailey@users.noreply.github.com>
Date: Thu, 4 Dec 2025 09:47:25 -0800
Subject: [PATCH] Don't set parent on non-transient symbols in mergeSymbolTable
 (#61560)

---
 src/compiler/checker.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index bfa81f69646..dfd47912720 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -2840,7 +2840,9 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 // When merging the module augmentation into a.ts, the symbol for `A` will itself be merged, so its parent
                 // should be the merged module symbol. But the symbol for `B` has only one declaration, so its parent should
                 // be the module augmentation symbol, which contains its only declaration.
-                merged.parent = mergedParent;
+                if (merged.flags & SymbolFlags.Transient) {
+                    merged.parent = mergedParent;
+                }
             }
             target.set(id, merged);
         });