Remove `--skip-yarn` in favor of `--skip-javascript`

Since #33079 Webpacker the default JavaScript compiler for Rails.
Webpacker uses `yarn` so seems like it doesn't make sense for Rails to keep
`--skip-yarn` option.

railties/lib/rails/app_updater.rb

@@ -21,7 +21,7 @@ def app_generator
       private
         def generator_options
           options = { api: !!Rails.application.config.api_only, update: true }
-          options[:skip_yarn] = !File.exist?(Rails.root.join("bin", "yarn"))
+          options[:skip_javascript] = !File.exist?(Rails.root.join("bin", "yarn"))
           options[:skip_active_record]  = !defined?(ActiveRecord::Railtie)
           options[:skip_active_storage] = !defined?(ActiveStorage::Engine) || !defined?(ActiveRecord::Railtie)
           options[:skip_action_mailer]  = !defined?(ActionMailer::Railtie)

railties/lib/rails/generators/app_base.rb

@@ -31,9 +31,6 @@ def self.add_shared_options_for(name)
         class_option :database,            type: :string, aliases: "-d", default: "sqlite3",
                                            desc: "Preconfigure for selected database (options: #{DATABASES.join('/')})"
 
-        class_option :skip_yarn,           type: :boolean, default: false,
-                                           desc: "Don't use Yarn for managing JavaScript dependencies"
-
         class_option :skip_gemfile,        type: :boolean, default: false,
                                            desc: "Don't create a Gemfile"
 

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -95,7 +95,7 @@ def bin
     def bin_when_updating
       bin
 
-      if options[:skip_yarn]
+      if options[:skip_javascript]
         remove_file "bin/yarn"
       end
     end
@@ -274,7 +274,7 @@ def initialize(*args)
         # Force sprockets and yarn to be skipped when generating API only apps.
         # Can't modify options hash as it's frozen by default.
         if options[:api]
-          self.options = options.merge(skip_sprockets: true, skip_javascript: true, skip_yarn: true).freeze
+          self.options = options.merge(skip_sprockets: true, skip_javascript: true).freeze
         end
       end
 
@@ -289,7 +289,7 @@ def create_root_files
         build(:gitignore)   unless options[:skip_git]
         build(:gemfile)     unless options[:skip_gemfile]
         build(:version_control)
-        build(:package_json) unless options[:skip_yarn]
+        build(:package_json) unless options[:skip_javascript]
       end
 
       def create_app_files
@@ -462,8 +462,8 @@ def delete_new_framework_defaults
         end
       end
 
-      def delete_bin_yarn_if_skip_yarn_option
-        remove_file "bin/yarn" if options[:skip_yarn]
+      def delete_bin_yarn
+        remove_file "bin/yarn" if options[:skip_javascript]
       end
 
       def finish_template

railties/lib/rails/generators/rails/app/templates/bin/setup.tt

@@ -14,9 +14,9 @@ FileUtils.chdir APP_ROOT do
   puts '== Installing dependencies =='
   system! 'gem install bundler --conservative'
   system('bundle check') || system!('bundle install')
-<% unless options.skip_yarn? -%>
+<% unless options.skip_javascript? -%>
 
-  # Install JavaScript dependencies if using Yarn
+  # Install JavaScript dependencies
   # system('bin/yarn')
 <% end -%>
 <% unless options.skip_active_record? -%>

railties/lib/rails/generators/rails/app/templates/bin/update.tt

@@ -14,9 +14,9 @@ FileUtils.chdir APP_ROOT do
   puts '== Installing dependencies =='
   system! 'gem install bundler --conservative'
   system('bundle check') || system!('bundle install')
-<% unless options.skip_yarn? -%>
+<% unless options.skip_javascript? -%>
 
-  # Install JavaScript dependencies if using Yarn
+  # Install JavaScript dependencies
   # system('bin/yarn')
 <% end -%>
 <% unless options.skip_active_record? -%>

railties/lib/rails/generators/rails/app/templates/config/initializers/assets.rb.tt

@@ -5,7 +5,7 @@ Rails.application.config.assets.version = '1.0'
 
 # Add additional assets to the asset load path.
 # Rails.application.config.assets.paths << Emoji.images_path
-<%- unless options[:skip_yarn] -%>
+<%- unless options[:skip_javascript] -%>
 # Add Yarn node_modules folder to the asset load path.
 Rails.application.config.assets.paths << Rails.root.join('node_modules')
 <%- end -%>

railties/lib/rails/generators/rails/plugin/plugin_generator.rb

@@ -88,7 +88,7 @@ def test
 
     PASSTHROUGH_OPTIONS = [
       :skip_active_record, :skip_active_storage, :skip_action_mailer, :skip_javascript, :skip_action_cable, :skip_sprockets, :database,
-      :skip_yarn, :api, :quiet, :pretend, :skip
+      :api, :quiet, :pretend, :skip
     ]
 
     def generate_test_dummy(force = false)

railties/lib/rails/generators/rails/plugin/templates/gitignore.tt

@@ -7,7 +7,7 @@ pkg/
 <%= dummy_path %>/db/*.sqlite3-journal
 <% end -%>
 <%= dummy_path %>/log/*.log
-<% unless options[:skip_yarn] -%>
+<% unless options[:skip_javascript] -%>
 <%= dummy_path %>/node_modules/
 <%= dummy_path %>/yarn-error.log
 <% end -%>

railties/test/generators/app_generator_test.rb

@@ -300,10 +300,10 @@ def test_app_update_does_not_remove_rack_cors_if_already_present
 
   def test_app_update_does_not_generate_yarn_contents_when_bin_yarn_is_not_used
     app_root = File.join(destination_root, "myapp")
-    run_generator [app_root, "--skip-yarn"]
+    run_generator [app_root, "--skip-javascript"]
 
     stub_rails_application(app_root) do
-      generator = Rails::Generators::AppGenerator.new ["rails"], { update: true, skip_yarn: true }, { destination_root: app_root, shell: @shell }
+      generator = Rails::Generators::AppGenerator.new ["rails"], { update: true, skip_javascript: true }, { destination_root: app_root, shell: @shell }
       generator.send(:app_const)
       quietly { generator.send(:update_bin_files) }
 

railties/test/generators/shared_generator_tests.rb

@@ -336,13 +336,14 @@ def test_generator_if_skip_sprockets_is_given
   end
 
   def test_generator_for_yarn
+    skip "#34009 disabled JS by default for plugins" if generator_class.name == "Rails::Generators::PluginGenerator"
     run_generator
     assert_file "#{application_path}/package.json", /dependencies/
     assert_file "#{application_path}/config/initializers/assets.rb", /node_modules/
   end
 
   def test_generator_for_yarn_skipped
-    run_generator([destination_root, "--skip-yarn"])
+    run_generator([destination_root, "--skip-javascript"])
     assert_no_file "#{application_path}/package.json"
     assert_no_file "#{application_path}/bin/yarn"