From d519e3f21ec36274726c44dab25c9eb48e34953f Mon Sep 17 00:00:00 2001
From: Klaus Meinhardt <klaus.meinhardt1@gmail.com>
Date: Mon, 3 Sep 2018 09:51:02 +0200
Subject: [PATCH] hand over to LanguageServiceHost.readDirectory

---
 src/services/services.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/services/services.ts b/src/services/services.ts
index dcc321b00d5..e9af862d002 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -1217,6 +1217,10 @@ namespace ts {
                 getDirectories: path => {
                     return host.getDirectories ? host.getDirectories(path) : [];
                 },
+                readDirectory(path, extensions, exclude, include, depth) {
+                    Debug.assertDefined(host.readDirectory, "'LanguageServiceHost.readDirectory' must be implemented to correctly process 'projectReferences'");
+                    return host.readDirectory!(path, extensions, exclude, include, depth);
+                },
                 onReleaseOldSourceFile,
                 hasInvalidatedResolution,
                 hasChangedAutomaticTypeDirectiveNames: host.hasChangedAutomaticTypeDirectiveNames