From ddc631c5d47150d5227470d64853a059d839e011 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Wed, 13 Dec 2017 13:41:17 -0800
Subject: [PATCH] Fix typo

---
 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 106d6391a91..f4e10aac606 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6394,7 +6394,7 @@ namespace ts {
                 }
                 if (t.flags & TypeFlags.Conditional) {
                     const trueBaseType = getBaseConstraint((<ConditionalType>t).trueType);
-                    const falseBaseType = getBaseConstraint((<ConditionalType>t).trueType);
+                    const falseBaseType = getBaseConstraint((<ConditionalType>t).falseType);
                     return trueBaseType && falseBaseType ? getUnionType([trueBaseType, falseBaseType]) : undefined;
                 }
                 if (t.flags & TypeFlags.Extends) {