Skip CSS when creating APIs.

Update CHANGELOG.

Address requested changes.

railties/CHANGELOG.md

@@ -1,3 +1,7 @@
+*   Skip CSS when generating APIs.
+
+    *Ruy Rocha*
+
 *   Rails console now indicates application name and the current Rails environment:
 
     ```txt

railties/lib/rails/generators/app_base.rb

@@ -599,6 +599,7 @@ module Rails
       end
 
       def css_gemfile_entry
+        return if options[:api]
         return unless options[:css]
 
         if !using_js_runtime? && options[:css] == "tailwind"

railties/test/generators/api_app_generator_test.rb

@@ -94,6 +94,18 @@ class ApiAppGeneratorTest < Rails::Generators::TestCase
     assert_no_directory "app/views"
   end
 
+  def test_generator_skip_css
+    run_generator [destination_root, "--api", "--css=tailwind"]
+
+    assert_file "Gemfile" do |content|
+      assert_no_match(%r/gem "tailwindcss-rails"/, content)
+    end
+
+    assert_no_file "app/views/layouts/application.html.erb" do |content|
+      assert_no_match(/tailwind/, content)
+    end
+  end
+
   def test_app_update_does_not_generate_unnecessary_config_files
     run_generator