From b300ef4bc7e739d957dc9e7ce90056909bcae40a Mon Sep 17 00:00:00 2001
From: Andrew Branch <andrewbranch@users.noreply.github.com>
Date: Fri, 16 Jul 2021 15:35:38 -0700
Subject: [PATCH] Check for watched directories before clearing map (#44947)

---
 src/server/editorServices.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index de3ae566a67..81afcd26f79 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -2288,8 +2288,10 @@ namespace ts.server {
             // If any of the project is still watching wild cards dont close the watcher
             if (forEachEntry(configFileExistenceInfo.config.projects, identity)) return;
 
-            clearMap(configFileExistenceInfo.config.watchedDirectories!, closeFileWatcherOf);
-            configFileExistenceInfo.config.watchedDirectories = undefined;
+            if (configFileExistenceInfo.config.watchedDirectories) {
+                clearMap(configFileExistenceInfo.config.watchedDirectories, closeFileWatcherOf);
+                configFileExistenceInfo.config.watchedDirectories = undefined;
+            }
             configFileExistenceInfo.config.watchedDirectoriesStale = undefined;
         }