From 8f52f21f0d13be285e7d2a9f8d7de1604c619d54 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Fri, 15 Feb 2019 06:22:17 -0800
Subject: [PATCH] Fix broken check in getUnionType (check was always true)

---
 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 579e27a848a..718c7e541b9 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -9359,7 +9359,7 @@ namespace ts {
                 }
                 switch (unionReduction) {
                     case UnionReduction.Literal:
-                        if (includes & TypeFlags.StringOrNumberLiteralOrUnique | TypeFlags.BooleanLiteral) {
+                        if (includes & (TypeFlags.Literal | TypeFlags.UniqueESSymbol)) {
                             removeRedundantLiteralTypes(typeSet, includes);
                         }
                         break;