From 1f6b84f445597655b015df52cef0784d9963492c Mon Sep 17 00:00:00 2001
From: Dmitry Gozman <dgozman@gmail.com>
Date: Wed, 9 Feb 2022 15:34:10 -0800
Subject: [PATCH] fix(mac): avoid printing empty line to stderr on mac (#11991)

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