From 37d27486fce50bd82b6b5095af880d435ed308f8 Mon Sep 17 00:00:00 2001
From: Brian White <mscdex@mscdex.net>
Date: Fri, 2 Aug 2019 21:04:56 -0400
Subject: [PATCH] path: improve normalization performance

PR-URL: https://github.com/nodejs/node/pull/28948
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
---
 lib/path.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/path.js b/lib/path.js
index e278c891482..884da4cd8e6 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -95,7 +95,10 @@ function normalizeString(path, allowAboveRoot, separator, isPathSeparator) {
           lastSegmentLength = 2;
         }
       } else {
-        res += (res.length > 0 ? separator : '') + path.slice(lastSlash + 1, i);
+        if (res.length > 0)
+          res += `${separator}${path.slice(lastSlash + 1, i)}`;
+        else
+          res = path.slice(lastSlash + 1, i);
         lastSegmentLength = i - lastSlash - 1;
       }
       lastSlash = i;