From a64dde7682c23f8b522ce7851d8f281a1250bea3 Mon Sep 17 00:00:00 2001
From: Andrew Branch <andrew@wheream.io>
Date: Wed, 17 Jul 2019 11:57:34 -0700
Subject: [PATCH] Fix build/lint due to differences in master and LKG

---
 src/compiler/emitter.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index a1207c9b892c9..8681a452e2a56 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -411,7 +411,11 @@ namespace ts {
                     }
                 );
                 if (emitOnlyDtsFiles && declarationTransform.transformed[0].kind === SyntaxKind.SourceFile) {
-                    const sourceFile = declarationTransform.transformed[0] as SourceFile;
+                    // Improved narrowing in master/3.6 makes this cast unnecessary, triggering a lint rule.
+                    // But at the same time, the LKG (3.5) necessitates it because it doesn’t narrow.
+                    // Once the LKG is updated to 3.6, this comment, the cast to `SourceFile`, and the
+                    // tslint directive can be all be removed.
+                    const sourceFile = declarationTransform.transformed[0] as SourceFile; // tslint:disable-line
                     exportedModulesFromDeclarationEmit = sourceFile.exportedModulesFromDeclarationEmit;
                 }
             }