From ccfc09d82c3cbc7e03ed293174f287c54439e908 Mon Sep 17 00:00:00 2001
From: TypeScript Bot <ts_bot@rcavanaugh.com>
Date: Tue, 16 Aug 2022 12:09:47 -0700
Subject: [PATCH] Cherry-pick PR #50306 into release-4.8 (#50324)

Component commits:
b73d93bf2a On windows handle the long paths in realpathSync.native Fixes #49470

Co-authored-by: Sheetal Nandi <shkamat@microsoft.com>
---
 src/compiler/sys.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/compiler/sys.ts b/src/compiler/sys.ts
index e293932b0b463..b0cc058fd93bf 100644
--- a/src/compiler/sys.ts
+++ b/src/compiler/sys.ts
@@ -1440,7 +1440,7 @@ namespace ts {
 
             const platform: string = _os.platform();
             const useCaseSensitiveFileNames = isFileSystemCaseSensitive();
-            const realpathSync = _fs.realpathSync.native ?? _fs.realpathSync;
+            const fsRealpath = !!_fs.realpathSync.native ? process.platform === "win32" ? fsRealPathHandlingLongPath : _fs.realpathSync.native : _fs.realpathSync;
 
             const fsSupportsRecursiveFsWatch = isNode4OrLater && (process.platform === "win32" || process.platform === "darwin");
             const getCurrentDirectory = memoize(() => process.cwd());
@@ -1889,9 +1889,13 @@ namespace ts {
                 return getAccessibleFileSystemEntries(path).directories.slice();
             }
 
+            function fsRealPathHandlingLongPath(path: string): string {
+                return path.length < 260 ? _fs.realpathSync.native(path) : _fs.realpathSync(path);
+            }
+
             function realpath(path: string): string {
                 try {
-                    return realpathSync(path);
+                    return fsRealpath(path);
                 }
                 catch {
                     return path;