Add `skip-webpack-install` option

This option is useful when want to check only the files generated by
`rails new`, or if want to do something before `webpacker:install`.

2 files changed, 8 insertions, 1 deletions

diff --git a/railties/lib/rails/generators/app_base.rb b/railties/lib/rails/generators/app_base.rb
index 410e53b4c0..2e4797e5bb 100644
--- a/railties/lib/rails/generators/app_base.rb
+++ b/railties/lib/rails/generators/app_base.rb
@@ -399,6 +399,10 @@ module Rails
         !options[:skip_spring] && !options.dev? && Process.respond_to?(:fork) && !RUBY_PLATFORM.include?("cygwin")
       end
 
+      def webpack_install?
+        !(options[:skip_javascript] || options[:skip_webpack_install])
+      end
+
       def depends_on_system_test?
         !(options[:skip_system_test] || options[:skip_test] || options[:api])
       end
@@ -420,7 +424,7 @@ module Rails
       end
 
       def run_webpack
-        unless options[:skip_javascript]
+        if webpack_install?
           rails_command "webpacker:install"
           rails_command "webpacker:install:#{options[:webpack]}" if options[:webpack] && options[:webpack] != "webpack"
         end
diff --git a/railties/lib/rails/generators/rails/app/app_generator.rb b/railties/lib/rails/generators/rails/app/app_generator.rb
index cefaffcb20..b118ea989b 100644
--- a/railties/lib/rails/generators/rails/app/app_generator.rb
+++ b/railties/lib/rails/generators/rails/app/app_generator.rb
@@ -261,6 +261,9 @@ module Rails
       class_option :webpack, type: :string, default: nil,
                              desc: "Preconfigure Webpack with a particular framework (options: #{WEBPACKS.join('/')})"
 
+      class_option :skip_webpack_install, type: :boolean, default: false,
+                                          desc: "Don't run Webpack install"
+
       def initialize(*args)
         super