Install older version unless using Node v18+

lib/generators/react_on_rails/base_generator.rb

@@ -91,7 +91,15 @@ def add_yarn_dependencies
             babel-plugin-macros"
 
         puts "Adding CSS handlers"
-        run "yarn add css-loader css-minimizer-webpack-plugin mini-css-extract-plugin style-loader"
+
+        # css_minimizer_webpack_plugin version 6 only supports Nodejs v18+
+        # When we bump our minimum Nodejs version to 18, we can remove this logic
+        # and install css_minimizer_webpack_plugin directly.
+        node_major_version = `node -v`.match(/^v(\d{,2})\./)[1]&.to_i
+        css_minimizer_webpack_plugin_version = node_major_version >= 18 ? "" : "@<6.0.0"
+        css_minimizer_webpack_plugin = "css-minimizer-webpack-plugin#{css_minimizer_webpack_plugin_version}"
+
+        run "yarn add css-loader '#{css_minimizer_webpack_plugin}' mini-css-extract-plugin style-loader"
 
         puts "Adding dev dependencies"
         run "yarn add -D @pmmmwh/react-refresh-webpack-plugin react-refresh"