From f914cb0deb573aa1baff5d6d676b7dd84dd00c91 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sun, 28 Sep 2025 11:21:37 -0400
Subject: [PATCH 1/2] Port https://github.com/microsoft/typescript-go/pull/1759

---
 src/compiler/checker.ts | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 10376e268a4f0..75f6878302093 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -24457,16 +24457,13 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                 }
                 return Ternary.False;
             }
-            if (isObjectLiteralType(target)) {
+            if (getObjectFlags(target) & ObjectFlags.FreshLiteral) {
                 for (const sourceProp of excludeProperties(getPropertiesOfType(source), excludedProperties)) {
                     if (!getPropertyOfObjectType(target, sourceProp.escapedName)) {
-                        const sourceType = getTypeOfSymbol(sourceProp);
-                        if (!(sourceType.flags & TypeFlags.Undefined)) {
-                            if (reportErrors) {
-                                reportError(Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(sourceProp), typeToString(target));
-                            }
-                            return Ternary.False;
+                        if (reportErrors) {
+                            reportError(Diagnostics.Property_0_does_not_exist_on_type_1, symbolToString(sourceProp), typeToString(target));
                         }
+                        return Ternary.False;
                     }
                 }
             }

From b9edcc112b9994efd07dd55d686ff5217e90ab01 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sun, 28 Sep 2025 11:23:32 -0400
Subject: [PATCH 2/2] Accept new baselines

---
 .../jsDeclarationsFunctionClassesCjsExportAssignment.js         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/baselines/reference/jsDeclarationsFunctionClassesCjsExportAssignment.js b/tests/baselines/reference/jsDeclarationsFunctionClassesCjsExportAssignment.js
index 2d051216e7abc..129d1c42d9aea 100644
--- a/tests/baselines/reference/jsDeclarationsFunctionClassesCjsExportAssignment.js
+++ b/tests/baselines/reference/jsDeclarationsFunctionClassesCjsExportAssignment.js
@@ -210,7 +210,7 @@ declare class Context {
      * @param {Input} input
      */
     constructor(input: Input);
-    state: any;
+    state: State;
     /**
      * @param {Input} input
      * @param {HookHandler=} handle