From 3142cc7ec8179bfd97124363c817818249ef47af Mon Sep 17 00:00:00 2001
From: Paul Keen <125715+pftg@users.noreply.github.com>
Date: Thu, 16 Nov 2023 22:58:16 +0100
Subject: [PATCH 1/2] feat: allows to skip node or yarn installation

---
 lib/language_pack/ruby.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/language_pack/ruby.rb b/lib/language_pack/ruby.rb
index d03b9ac6c..e71744900 100644
--- a/lib/language_pack/ruby.rb
+++ b/lib/language_pack/ruby.rb
@@ -1013,7 +1013,7 @@ def pg_adapters
   # @note execjs will blow up if no JS RUNTIME is detected and is loaded.
   # @return [Array] the node.js binary path if we need it or an empty Array
   def add_node_js_binary
-    return [] if node_js_preinstalled?
+    return [] if node_js_preinstalled? || env("HEROKU_SKIP_NODE_INSTALL")
 
     if Pathname(build_path).join("package.json").exist? ||
          bundler.has_gem?('execjs') ||
@@ -1045,7 +1045,7 @@ def add_node_js_binary
   end
 
   def add_yarn_binary
-    return [] if yarn_preinstalled?
+    return [] if yarn_preinstalled? || env("HEROKU_SKIP_NODE_INSTALL")
 
     if Pathname(build_path).join("yarn.lock").exist? || bundler.has_gem?('webpacker')
 

From 2dfd45296ab0e184d72aeebb3b74f3bf7e737a0b Mon Sep 17 00:00:00 2001
From: Paul Keen <125715+pftg@users.noreply.github.com>
Date: Sat, 18 Nov 2023 12:09:21 +0100
Subject: [PATCH 2/2] adds changelog

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e79994251..1b7887ed5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Main (unreleased)
 
+- Apps with the environment variable `HEROKU_SKIP_NODE_INSTALL=1` set will no longer install auto-install nodejs and yarn.
+
 ## v262 (2023/11/08)
 
 - Warn when relying on default Node.js or Yarn versions (https://github.com/heroku/heroku-buildpack-ruby/pull/1401)