From 8604d4e428d5d35ef215b614cbe60a0a3bd97860 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sat, 21 Sep 2019 09:07:49 -0700
Subject: [PATCH] Include type operators in aliased type checks

---
 src/compiler/checker.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 3d2fbe94c19..1891eba1591 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9630,6 +9630,7 @@ namespace ts {
                 case SyntaxKind.IntersectionType:
                 case SyntaxKind.IndexedAccessType:
                 case SyntaxKind.ConditionalType:
+                case SyntaxKind.TypeOperator:
                     return isAliasedType(parent);
                 case SyntaxKind.TypeAliasDeclaration:
                     return true;