From 6fe4be21e425efc7d454c6bffe4a689006608183 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Thu, 7 May 2020 10:14:29 -0700
Subject: [PATCH] Exclude arrays and tuples from full intersection property
 check

---
 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 d302e867aea..e0ac787f8b4 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -15874,7 +15874,7 @@ namespace ts {
                 // recursive intersections that are structurally similar but not exactly identical. See #37854.
                 if (result && !inPropertyCheck && (
                     target.flags & TypeFlags.Intersection && (isPerformingExcessPropertyChecks || isPerformingCommonPropertyChecks) ||
-                    isNonGenericObjectType(target) && source.flags & TypeFlags.Intersection && getApparentType(source).flags & TypeFlags.StructuredType && !some((<IntersectionType>source).types, t => !!(getObjectFlags(t) & ObjectFlags.NonInferrableType)))) {
+                    isNonGenericObjectType(target) && !isArrayType(target) && !isTupleType(target) && source.flags & TypeFlags.Intersection && getApparentType(source).flags & TypeFlags.StructuredType && !some((<IntersectionType>source).types, t => !!(getObjectFlags(t) & ObjectFlags.NonInferrableType)))) {
                     inPropertyCheck = true;
                     result &= recursiveTypeRelatedTo(source, target, reportErrors, IntersectionState.PropertyCheck);
                     inPropertyCheck = false;