Unify Rubocop config (#2153)

### Summary

Extracted from #1868 because it adds `spec/performance/bench.rb` and the
default Rubocop config doesn't fit our repo.

### Pull Request checklist

- [ ] ~Add/update test to cover these changes~
- [ ] ~Update documentation~
- [ ] ~Update CHANGELOG file~


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Refactor**
* Centralized RuboCop configuration across the monorepo by establishing
a shared root configuration file inherited by all projects, ensuring
consistent code quality standards.
* Consolidated development dependencies into a shared file to reduce
duplication across projects.

* **Chores**
* Removed inline linting suppressions throughout the codebase for
uniform code quality enforcement.
  * Updated test metadata formatting for consistency.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Alexey Romanov <alexey.v.romanov@gmail.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Ihab Adham <ihabadham@users.noreply.github.com>
Co-authored-by: ihabadham <ihabadham4p@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: 5 people

.prettierignore

@@ -19,7 +19,6 @@ spec/dummy/public
 *.res.js
 
 # Prettier doesn't understand ERB syntax in YAML files and can damage templates
-.rubocop.yml
 *.yml
 *.yaml
 # Intentionally invalid

.rubocop.yml

@@ -0,0 +1,100 @@
+# Root RuboCop configuration for React on Rails monorepo
+# This contains shared settings inherited by react_on_rails/ and react_on_rails_pro/
+require:
+  - rubocop-performance
+  - rubocop-rspec
+
+AllCops:
+  NewCops: enable
+  DisplayCopNames: true
+  SuggestExtensions: false
+  TargetRubyVersion: 3.0
+
+  Include:
+    - '**/Rakefile'
+    - '**/config.ru'
+    - '**/Gemfile'
+    - '**/*.rb'
+    - '**/*.rake'
+
+  Exclude:
+    - '**/*.js'
+    - '**/node_modules/**/*'
+    - '**/public/**/*'
+    - '**/tmp/**/*'
+    - 'coverage/**/*'
+    - 'gen-examples/**/*'
+    - 'node_modules/**/*'
+    - 'spec/fixtures/**/*'
+    - 'spec/react_on_rails/dummy-for-generators/**/*'
+    - '**/vendor/**/*'
+
+Naming/FileName:
+  Exclude:
+    - '**/Gemfile'
+    - '**/Gemfile.*'
+    - '**/Rakefile'
+
+Layout/LineLength:
+  Max: 120
+
+Style/StringLiterals:
+  EnforcedStyle: double_quotes
+
+Style/Documentation:
+  Enabled: false
+
+Style/HashEachMethods:
+  Enabled: true
+
+Style/HashTransformKeys:
+  Enabled: true
+
+Style/HashTransformValues:
+  Enabled: true
+
+Metrics/AbcSize:
+  Max: 28
+
+Metrics/ClassLength:
+  Max: 150
+
+Metrics/CyclomaticComplexity:
+  Max: 8
+
+Metrics/PerceivedComplexity:
+  Max: 10
+
+Metrics/ParameterLists:
+  Max: 5
+  CountKeywordArgs: false
+
+Metrics/MethodLength:
+  Max: 41
+
+Metrics/ModuleLength:
+  Max: 180
+
+RSpec/DescribeClass:
+  Enabled: false
+
+RSpec/ExampleLength:
+  Enabled: false
+
+RSpec/MessageSpies:
+  Enabled: false
+
+RSpec/MessageChain:
+  Enabled: false
+
+RSpec/MultipleExpectations:
+  Enabled: false
+
+RSpec/MultipleMemoizedHelpers:
+  Max: 12
+
+RSpec/NestedGroups:
+  Max: 5
+
+Style/FrozenStringLiteralComment:
+  EnforcedStyle: always

Gemfile.shared_dev_dependencies

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# Shared development dependencies for react_on_rails and react_on_rails_pro
+# This ensures consistent versions across the monorepo
+
+group :development, :test do
+  gem "rubocop", "1.61.0", require: false
+  gem "rubocop-performance", "~>1.20.0", require: false
+  gem "rubocop-rspec", "~>2.26", require: false
+end

react_on_rails/.rubocop.yml

@@ -1,61 +1,23 @@
-# This is the configuration used to check the rubocop source code.
-# Check out: https://github.com/bbatsov/rubocop
-require:
-  - rubocop-performance
-  - rubocop-rspec
+# Inherits from root config
+inherit_from: ../.rubocop.yml
+
+# Merge Exclude arrays with parent instead of replacing them
+inherit_mode:
+  merge:
+    - Exclude
 
 AllCops:
-  NewCops: enable
-  DisplayCopNames: true
-  TargetRubyVersion: 3.0.0
   SuggestExtensions: false
 
-  Include:
-    - '**/Rakefile'
-    - '**/config.ru'
-    - 'Gemfile'
-    - '**/*.rb'
-    - '**/*.rake'
-
   Exclude:
-    - '**/*.js'
-    - '**/node_modules/**/*'
-    - '**/public/**/*'
-    - '**/tmp/**/*'
-    - 'coverage/**/*'
-    - 'gen-examples/examples/**/*'
-    - 'node_modules/**/*'
-    - '../react_on_rails_pro/**/*'  # Exclude pro package (has its own linting)
     - 'spec/dummy/bin/*'
-    - 'spec/fixtures/**/*'
-    - 'spec/react_on_rails/dummy-for-generators/**/*'
-    - 'tmp/**/*'
-    - 'vendor/**/*'
 
 Naming/FileName:
   Exclude:
     - '**/Gemfile*'
     - '**/Rakefile'
     - '**/Steepfile'
 
-Layout/LineLength:
-  Max: 120
-
-Style/StringLiterals:
-  EnforcedStyle: double_quotes
-
-Style/Documentation:
-  Enabled: false
-
-Style/HashEachMethods:
-  Enabled: true
-
-Style/HashTransformKeys:
-  Enabled: true
-
-Style/HashTransformValues:
-  Enabled: true
-
 Lint/AssignmentInCondition:
   Exclude:
     - 'spec/dummy/bin/spring'
@@ -66,33 +28,19 @@ Lint/SuppressedException:
     - 'spec/dummy/bin/rake'
 
 Metrics/AbcSize:
-  Max: 28
   Exclude:
     - 'lib/generators/react_on_rails/install_generator.rb'  # Generator setup methods require comprehensive error handling
 
-Metrics/CyclomaticComplexity:
-  Max: 7
-
-Metrics/PerceivedComplexity:
-  Max: 10
-
 Metrics/ClassLength:
-  Max: 150
   Exclude:
     - 'lib/generators/react_on_rails/base_generator.rb'  # Generator complexity justified
     - 'lib/react_on_rails/dev/server_manager.rb'  # Dev tool with comprehensive help system
 
-Metrics/ParameterLists:
-  Max: 5
-  CountKeywordArgs: false
-
 Metrics/MethodLength:
-  Max: 41
   Exclude:
     - 'lib/generators/react_on_rails/install_generator.rb'  # Generator setup methods require comprehensive error handling
 
 Metrics/ModuleLength:
-  Max: 180
   Exclude:
     - 'spec/react_on_rails/engine_spec.rb'  # Comprehensive engine tests require many examples
 
@@ -107,18 +55,6 @@ RSpec/AnyInstance:
     - 'spec/react_on_rails/binstubs/dev_static_spec.rb'
     - 'spec/react_on_rails/dev/**/*_spec.rb'  # Dev module tests require system mocking
 
-RSpec/DescribeClass:
-  Enabled: false
-
-RSpec/ExampleLength:
-  Enabled: false
-
-RSpec/MessageSpies:
-  Enabled: false
-
-RSpec/NestedGroups:
-  Max: 4
-
 RSpec/BeforeAfterAll:
   Exclude:
     - 'spec/react_on_rails/generators/dev_tests_generator_spec.rb'
@@ -127,19 +63,10 @@ RSpec/BeforeAfterAll:
     - 'spec/react_on_rails/binstubs/dev_static_spec.rb'
     - 'spec/react_on_rails/dev/**/*_spec.rb'  # Dev module tests require global setup
 
-RSpec/MessageChain:
-  Enabled: false
-
-RSpec/MultipleExpectations:
-  Enabled: false
-
 RSpec/MultipleDescribes:
   Exclude:
     - 'spec/dummy/spec/system/integration_spec.rb'
 
-RSpec/MultipleMemoizedHelpers:
-  Max: 12
-
 Style/GlobalVars:
   Exclude:
     - 'spec/dummy/config/environments/development.rb'
@@ -156,4 +83,3 @@ RSpec/InstanceVariable:
 RSpec/StubbedMock:
   Exclude:
     - 'spec/react_on_rails/dev/**/*_spec.rb'  # Dev module tests use mixed stub/mock patterns
-

react_on_rails/Gemfile.development_dependencies

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+eval_gemfile File.expand_path("../Gemfile.shared_dev_dependencies", __dir__)
+
 gem "shakapacker", "9.4.0"
 gem "bootsnap", require: false
 gem "rails", "~> 7.1"
@@ -35,9 +37,6 @@ group :development, :test do
   gem "pry-rescue"
   gem "rbs", require: false
   gem "steep", require: false
-  gem "rubocop", "1.61.0", require: false
-  gem "rubocop-performance", "~>1.20.0", require: false
-  gem "rubocop-rspec", "~>2.26", require: false
   gem "spring", "~> 4.0"
   gem "lefthook", require: false
   # Added for Ruby 3.5+ compatibility to silence warnings

react_on_rails/lib/generators/react_on_rails/templates/base/base/bin/switch-bundler

@@ -61,7 +61,6 @@ class BundlerSwitcher
     puts "✅ Updated assets_bundler to '#{@target_bundler}'"
   end
 
-  # rubocop:disable Metrics/CyclomaticComplexity
   def update_dependencies
     puts "📦 Updating package.json dependencies..."
 
@@ -86,9 +85,7 @@ class BundlerSwitcher
     puts "✅ Removed #{@target_bundler == 'rspack' ? 'webpack' : 'rspack'} dependencies"
     File.write(package_json_path, JSON.pretty_generate(package_json))
   end
-  # rubocop:enable Metrics/CyclomaticComplexity
 
-  # rubocop:disable Metrics/CyclomaticComplexity
   def install_dependencies
     puts "📥 Installing #{@target_bundler} dependencies..."
 
@@ -123,7 +120,6 @@ class BundlerSwitcher
 
     puts "✅ Installed #{@target_bundler} dependencies"
   end
-  # rubocop:enable Metrics/CyclomaticComplexity
 
   def detect_package_manager
     return "yarn" if File.exist?("yarn.lock")

react_on_rails/lib/react_on_rails/doctor.rb

@@ -468,7 +468,6 @@ def check_version_wildcards
       check_npm_wildcards
     end
 
-    # rubocop:disable Metrics/CyclomaticComplexity
     def check_gem_wildcards
       gemfile_path = ENV["BUNDLE_GEMFILE"] || "Gemfile"
       return unless File.exist?(gemfile_path)
@@ -490,9 +489,7 @@ def check_gem_wildcards
         # Ignore errors reading Gemfile
       end
     end
-    # rubocop:enable Metrics/CyclomaticComplexity
 
-    # rubocop:disable Metrics/CyclomaticComplexity
     def check_npm_wildcards
       return unless File.exist?("package.json")
 
@@ -514,7 +511,6 @@ def check_npm_wildcards
         # Ignore other errors
       end
     end
-    # rubocop:enable Metrics/CyclomaticComplexity
 
     def check_key_configuration_files
       files_to_check = {
@@ -538,7 +534,6 @@ def check_key_configuration_files
       check_server_rendering_engine
     end
 
-    # rubocop:disable Metrics/CyclomaticComplexity
     def check_layout_files
       layout_files = Dir.glob("app/views/layouts/**/*.erb")
       return if layout_files.empty?
@@ -565,7 +560,6 @@ def check_layout_files
         end
       end
     end
-    # rubocop:enable Metrics/CyclomaticComplexity
 
     # rubocop:disable Metrics/CyclomaticComplexity
     def check_server_rendering_engine
@@ -603,7 +597,6 @@ def check_server_rendering_engine
     end
     # rubocop:enable Metrics/CyclomaticComplexity
 
-    # rubocop:disable Metrics/CyclomaticComplexity
     def check_shakapacker_configuration_details
       return unless File.exist?("config/shakapacker.yml")
 
@@ -632,7 +625,6 @@ def check_shakapacker_configuration_details
         checker.add_warning("  ⚠️  Could not run 'rake shakapacker:info': #{e.message}")
       end
     end
-    # rubocop:enable Metrics/CyclomaticComplexity
 
     def check_react_on_rails_configuration_details
       check_react_on_rails_initializer

react_on_rails/lib/react_on_rails/server_rendering_pool/ruby_embedded_java_script.rb

@@ -49,7 +49,6 @@ def reset_pool_if_server_bundle_was_modified
         # Note, js_code does not have to be based on React.
         # js_code MUST RETURN json stringify Object
         # Calling code will probably call 'html_safe' on return value before rendering to the view.
-        # rubocop:disable Metrics/CyclomaticComplexity
         def exec_server_render_js(js_code, render_options, js_evaluator = nil)
           js_evaluator ||= self
           if render_options.trace
@@ -86,7 +85,6 @@ def exec_server_render_js(js_code, render_options, js_evaluator = nil)
           # We need to parse each chunk and replay the console messages.
           result.transform { |chunk| parse_result_and_replay_console_messages(chunk, render_options) }
         end
-        # rubocop:enable Metrics/CyclomaticComplexity
 
         def trace_js_code_used(msg, js_code, file_name = "tmp/server-generated.js", force: false)
           return unless ReactOnRails.configuration.trace || force