From b38d7ac9fd41c46b70c0e5fcfe815a25c98270a4 Mon Sep 17 00:00:00 2001
From: Arthur Ozga <aozgaa-ms@outlook.com>
Date: Mon, 26 Sep 2016 11:19:06 -0700
Subject: [PATCH] Annotate directorySeparator

---
 src/compiler/core.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index 72d05e1cfd7..aca9701eee7 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -1044,9 +1044,14 @@ namespace ts {
         return 0;
     }
 
+    /**
+     * Internally, we represent paths as strings with '/' as the directory separator.
+     * When we make system calls (eg: LanguageServiceHost.getDirectory()),
+     * we expect the host to correctly handle paths in our specified format.
+     */
     export const directorySeparator = "/";
     const directorySeparatorCharCode = CharacterCodes.slash;
-    function getNormalizedParts(normalizedSlashedPath: string, rootLength: number) {
+    function getNormalizedParts(normalizedSlashedPath: string, rootLength: number): string[] {
         const parts = normalizedSlashedPath.substr(rootLength).split(directorySeparator);
         const normalized: string[] = [];
         for (const part of parts) {