From 54896ab011b6cb631a9d1f0154e9aa060f55be13 Mon Sep 17 00:00:00 2001
From: Antoine du Hamel <duhamelantoine1995@gmail.com>
Date: Sat, 7 Jan 2023 16:36:51 +0100
Subject: [PATCH] module: fix unintended mutation

Refs: https://github.com/nodejs/node/pull/46061#issuecomment-1372246648
PR-URL: https://github.com/nodejs/node/pull/46108
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jacob Smith <jacob@frende.me>
---
 lib/internal/modules/cjs/loader.js | 10 +++++-----
 test/fixtures/require-resolve.js   |  5 +++++
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/lib/internal/modules/cjs/loader.js b/lib/internal/modules/cjs/loader.js
index 46e58400fb34b5..80b931ef70825c 100644
--- a/lib/internal/modules/cjs/loader.js
+++ b/lib/internal/modules/cjs/loader.js
@@ -29,6 +29,7 @@ const {
   ArrayPrototypeJoin,
   ArrayPrototypeMap,
   ArrayPrototypePush,
+  ArrayPrototypePushApply,
   ArrayPrototypeSlice,
   ArrayPrototypeSplice,
   ArrayPrototypeUnshift,
@@ -667,12 +668,11 @@ Module._findPath = function(request, paths, isMain) {
       return filename;
     }
 
-    if (exts === undefined) {
-      exts = [''];
-    } else {
-      ArrayPrototypeUnshift(exts, '');
+    const extensions = [''];
+    if (exts !== undefined) {
+      ArrayPrototypePushApply(extensions, exts);
     }
-    reportModuleNotFoundToWatchMode(basePath, exts);
+    reportModuleNotFoundToWatchMode(basePath, extensions);
   }
 
   return false;
diff --git a/test/fixtures/require-resolve.js b/test/fixtures/require-resolve.js
index 86bc6415c8eb55..9a7fc3385143aa 100644
--- a/test/fixtures/require-resolve.js
+++ b/test/fixtures/require-resolve.js
@@ -98,3 +98,8 @@ assert.strictEqual(
   require.resolve('./printA.js', {}),
   require.resolve('./printA.js')
 );
+
+assert.strictEqual(
+  require.resolve('no_index/'),
+  path.join(__dirname, 'node_modules', 'no_index', 'lib', 'index.js'),
+)