From 07ba0902770b44babccff4dc821985ce7af376d0 Mon Sep 17 00:00:00 2001
From: Pete Gonzalez <4673363+octogonz@users.noreply.github.com>
Date: Wed, 28 Jan 2026 19:37:03 -0800
Subject: [PATCH 1/3] Fix a longstanding bug where a Node.js child process
 could hang when accessing `process.stdin`, ultimately caused by Rush spawning
 with stdin='pipe' yet not properly closing the pipe.

---
 libraries/rush-lib/src/utilities/Utilities.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/rush-lib/src/utilities/Utilities.ts b/libraries/rush-lib/src/utilities/Utilities.ts
index 6c502224ef..683439b16e 100644
--- a/libraries/rush-lib/src/utilities/Utilities.ts
+++ b/libraries/rush-lib/src/utilities/Utilities.ts
@@ -687,7 +687,7 @@ export class Utilities {
       }
     });
 
-    const stdio: child_process.StdioOptions = handleOutput ? ['pipe', 'pipe', 'pipe'] : [0, 1, 2];
+    const stdio: child_process.StdioOptions = handleOutput ? [0, 'pipe', 'pipe'] : [0, 1, 2];
     if (ipc) {
       stdio.push('ipc');
     }

From c2c60d0576005a80ed4daf53c7ce2b7b0a99afa2 Mon Sep 17 00:00:00 2001
From: Pete Gonzalez <4673363+octogonz@users.noreply.github.com>
Date: Wed, 28 Jan 2026 19:43:53 -0800
Subject: [PATCH 2/3] rush change

---
 .../octogonz-rush-stdin-hang_2026-01-29-03-43.json     | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 common/changes/@microsoft/rush/octogonz-rush-stdin-hang_2026-01-29-03-43.json

diff --git a/common/changes/@microsoft/rush/octogonz-rush-stdin-hang_2026-01-29-03-43.json b/common/changes/@microsoft/rush/octogonz-rush-stdin-hang_2026-01-29-03-43.json
new file mode 100644
index 0000000000..f597b7613d
--- /dev/null
+++ b/common/changes/@microsoft/rush/octogonz-rush-stdin-hang_2026-01-29-03-43.json
@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "Fix a longstanding issue where a package.json script could hang on Windows if it accessed STDIN under certain circumstances",
+      "type": "none"
+    }
+  ],
+  "packageName": "@microsoft/rush"
+}
\ No newline at end of file

From 61a638a3d722f79719cff6a4e105c8d0bc032d57 Mon Sep 17 00:00:00 2001
From: Pete Gonzalez <4673363+octogonz@users.noreply.github.com>
Date: Thu, 29 Jan 2026 11:35:01 -0800
Subject: [PATCH 3/3] PR feedback

---
 libraries/rush-lib/src/utilities/Utilities.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/rush-lib/src/utilities/Utilities.ts b/libraries/rush-lib/src/utilities/Utilities.ts
index 683439b16e..6fb93957f3 100644
--- a/libraries/rush-lib/src/utilities/Utilities.ts
+++ b/libraries/rush-lib/src/utilities/Utilities.ts
@@ -687,7 +687,7 @@ export class Utilities {
       }
     });
 
-    const stdio: child_process.StdioOptions = handleOutput ? [0, 'pipe', 'pipe'] : [0, 1, 2];
+    const stdio: child_process.StdioOptions = handleOutput ? ['ignore', 'pipe', 'pipe'] : [0, 1, 2];
     if (ipc) {
       stdio.push('ipc');
     }