From 6ac0dbcaef51ef09148e935c39e4108f53a2dfe7 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Tue, 16 Apr 2019 09:46:45 -0700
Subject: [PATCH] Propagate ObjectFlags.NonInferrableType through widening

---
 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 72e85b3f8a8..4fb20294d45 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -14231,7 +14231,7 @@ namespace ts {
             const result = createAnonymousType(type.symbol, members, emptyArray, emptyArray,
                 stringIndexInfo && createIndexInfo(getWidenedType(stringIndexInfo.type), stringIndexInfo.isReadonly),
                 numberIndexInfo && createIndexInfo(getWidenedType(numberIndexInfo.type), numberIndexInfo.isReadonly));
-            result.objectFlags |= (getObjectFlags(type) & ObjectFlags.JSLiteral); // Retain js literal flag through widening
+            result.objectFlags |= (getObjectFlags(type) & (ObjectFlags.JSLiteral | ObjectFlags.NonInferrableType)); // Retain js literal flag through widening
             return result;
         }