From c77f0c41c29284819f9ef2cc0157d7612ab95d53 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Fri, 9 Nov 2018 10:48:28 -0800
Subject: [PATCH] Add affectsModuleResolution to compile options:
 maxNodeModuleJsDepth Fixes inferred project incorrectly modifying existing
 compiler options Fixes #27108

---
 src/compiler/commandLineParser.ts | 2 +-
 src/server/project.ts             | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 3947ef5184..e3b6fe69d2 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -777,7 +777,7 @@ namespace ts {
         {
             name: "maxNodeModuleJsDepth",
             type: "number",
-            // TODO: GH#27108 affectsModuleResolution: true,
+            affectsModuleResolution: true,
             category: Diagnostics.Advanced_Options,
             description: Diagnostics.The_maximum_dependency_depth_to_search_under_node_modules_and_load_JavaScript_files
         },
diff --git a/src/server/project.ts b/src/server/project.ts
index d55c950e1e..7b11f48fbd 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -1228,11 +1228,10 @@ namespace ts.server {
 
         setCompilerOptions(options?: CompilerOptions) {
             // Avoid manipulating the given options directly
-            const newOptions = options ? cloneCompilerOptions(options) : this.getCompilationSettings();
-            if (!newOptions) {
+            if (!options && !this.getCompilationSettings()) {
                 return;
             }
-
+            const newOptions = cloneCompilerOptions(options || this.getCompilationSettings());
             if (this._isJsInferredProject && typeof newOptions.maxNodeModuleJsDepth !== "number") {
                 newOptions.maxNodeModuleJsDepth = 2;
             }