From 167ebcd93b69707bf257ab31858f0e6b22528782 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wewigham@microsoft.com>
Date: Mon, 19 Apr 2021 22:35:11 -0700
Subject: [PATCH] Check type flags before checking multiple-meaning object
 flags (#43745)

---
 src/compiler/checker.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 3479cdfa563..125a5be6cd6 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -4445,7 +4445,7 @@ namespace ts {
         }
 
         function isClassInstanceSide(type: Type) {
-            return !!type.symbol && !!(type.symbol.flags & SymbolFlags.Class) && (type === getDeclaredTypeOfClassOrInterface(type.symbol) || !!(getObjectFlags(type) & ObjectFlags.IsClassInstanceClone));
+            return !!type.symbol && !!(type.symbol.flags & SymbolFlags.Class) && (type === getDeclaredTypeOfClassOrInterface(type.symbol) || (!!(type.flags & TypeFlags.Object) && !!(getObjectFlags(type) & ObjectFlags.IsClassInstanceClone)));
         }
 
         function createNodeBuilder() {
@@ -11857,7 +11857,7 @@ namespace ts {
         }
 
         function elaborateNeverIntersection(errorInfo: DiagnosticMessageChain | undefined, type: Type) {
-            if (getObjectFlags(type) & ObjectFlags.IsNeverIntersection) {
+            if (type.flags & TypeFlags.Intersection && getObjectFlags(type) & ObjectFlags.IsNeverIntersection) {
                 const neverProp = find(getPropertiesOfUnionOrIntersectionType(<IntersectionType>type), isDiscriminantWithNeverType);
                 if (neverProp) {
                     return chainDiagnosticMessages(errorInfo, Diagnostics.The_intersection_0_was_reduced_to_never_because_property_1_has_conflicting_types_in_some_constituents,