From 60c9249ac4b18c42521dade5d014b32216a4dfeb Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Fri, 26 Jan 2018 06:20:39 -0800
Subject: [PATCH] Properly handle inferred type parameters in declaration
 emitter

---
 src/compiler/declarationEmitter.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compiler/declarationEmitter.ts b/src/compiler/declarationEmitter.ts
index 794cb4ff2b3..22e8299df4d 100644
--- a/src/compiler/declarationEmitter.ts
+++ b/src/compiler/declarationEmitter.ts
@@ -554,7 +554,10 @@ namespace ts {
                 write(" extends ");
                 emitType(node.extendsType);
                 write(" ? ");
+                const prevEnclosingDeclaration = enclosingDeclaration;
+                enclosingDeclaration = node.trueType;
                 emitType(node.trueType);
+                enclosingDeclaration = prevEnclosingDeclaration;
                 write(" : ");
                 emitType(node.falseType);
             }