From 786bb337f0f74ccf0ff1197780e09288e42d667a Mon Sep 17 00:00:00 2001
From: Andrey Lushnikov <lushnikov@chromium.org>
Date: Wed, 9 Feb 2022 16:38:30 -0700
Subject: [PATCH] cherry-pick(#11991): fix(mac): avoid printing empty line to
 stderr on mac (#11993)

SHA: 1f6b84f445597655b015df52cef0784d9963492c

It turns out, `sw_vers` prints an empty stderr line and we inherit it.

Co-authored-by: Dmitry Gozman <dgozman@gmail.com>
---
 packages/playwright-core/src/utils/utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/playwright-core/src/utils/utils.ts b/packages/playwright-core/src/utils/utils.ts
index 683f39c156..7bc5c94c3f 100644
--- a/packages/playwright-core/src/utils/utils.ts
+++ b/packages/playwright-core/src/utils/utils.ts
@@ -457,7 +457,7 @@ function determineUserAgent(): string {
     osIdentifier = 'windows';
     osVersion = `${version[0]}.${version[1]}`;
   } else if (process.platform === 'darwin') {
-    const version = execSync('sw_vers -productVersion').toString().trim().split('.');
+    const version = execSync('sw_vers -productVersion', { stdio: ['ignore', 'pipe', 'ignore'] }).toString().trim().split('.');
     osIdentifier = 'macOS';
     osVersion = `${version[0]}.${version[1]}`;
   } else if (process.platform === 'linux') {