From f4fa2eb28e014ebd42f6a368ab5b91ed7a128bf5 Mon Sep 17 00:00:00 2001
From: Joscha Feth <joscha@feth.com>
Date: Sun, 15 Apr 2018 01:51:01 +1000
Subject: [PATCH] undefined instead of null

---
 src/services/preProcess.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/preProcess.ts b/src/services/preProcess.ts
index 208d276a73c..f0958193ceb 100644
--- a/src/services/preProcess.ts
+++ b/src/services/preProcess.ts
@@ -13,7 +13,7 @@ namespace ts {
         const importedFiles: FileReference[] = [];
         let ambientExternalModules: { ref: FileReference, depth: number }[];
         let braceNesting = 0;
-        let lastToken: SyntaxKind = null;
+        let lastToken: SyntaxKind;
         // assume that text represent an external module if it contains at least one top level import/export
         // ambient modules that are found inside external modules are interpreted as module augmentations
         let externalModule = false;