From e97aa45428f16b54778870748809c68a05d43c87 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Burak=20Sormage=C3=A7?= <bsormagec@users.noreply.github.com>
Date: Fri, 30 Jan 2026 16:17:36 +0000
Subject: [PATCH] fix(windows): handle undefined environment variables in
 runCommandWithTimeout

---
 src/process/exec.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/process/exec.ts b/src/process/exec.ts
index 28cabce3a9..b71fc6842b 100644
--- a/src/process/exec.ts
+++ b/src/process/exec.ts
@@ -100,7 +100,11 @@ export async function runCommandWithTimeout(
     return false;
   })();
 
-  const resolvedEnv = env ? { ...process.env, ...env } : { ...process.env };
+  const resolvedEnv = Object.fromEntries(
+    Object.entries({ ...process.env, ...(env ?? {}) })
+      .filter(([, value]) => value !== undefined)
+      .map(([key, value]) => [key, String(value)]),
+  );
   if (shouldSuppressNpmFund) {
     if (resolvedEnv.NPM_CONFIG_FUND == null) {
       resolvedEnv.NPM_CONFIG_FUND = "false";