8000 Add --rspack generator option for faster builds by justin808 · Pull Request #1852 · shakacode/react_on_rails · GitHub
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@justin808 justin808 commented Oct 6, 2025

Summary

Implements --rspack flag for react_on_rails:install generator to use Rspack bundler instead of Webpack, providing significantly faster builds (~20x improvement with SWC).

Based on implementation patterns from react_on_rails-demos PR #20.

Key Changes

  • Added --rspack option to install_generator.rb and base_generator.rb
  • Conditional dependency installation: Installs rspack packages instead of webpack when flag is used
  • Auto-configures shakapacker.yml: Sets assets_bundler: 'rspack' and webpack_loader: 'swc'
  • Created bin/switch-bundler utility: Allows switching between bundlers post-installation

Implementation Details

Rspack Dependencies Installed

Production:

  • @rspack/core - Core Rspack bundler
  • rspack-manifest-plugin - Manifest generation

Development:

  • @rspack/cli - Rspack CLI tools
  • @rspack/plugin-react-refresh - React Fast Refresh for Rspack
  • react-refresh - React Fast Refresh runtime

Webpack Dependencies NOT Installed (with --rspack)

  • webpack, webpack-cli, webpack-dev-server
  • webpack-assets-manifest, webpack-merge
  • @pmmmwh/react-refresh-webpack-plugin

Configuration Changes

When --rspack is used, config/shakapacker.yml is updated:

default: &default
  assets_bundler: 'rspack'  # Added
  webpack_loader: 'swc'      # Changed from 'babel'

Usage Examples

Generate new app with Rspack:

rails generate react_on_rails:install --rspack

With TypeScript:

rails generate react_on_rails:install --rspack --typescript

With Redux:

rails generate react_on_rails:install --rspack --redux

Switch existing app:

bin/switch-bundler rspack

Performance Benefits

According to react_on_rails-demos PR #20:

  • Build times: ~53-270ms with Rspack vs typical webpack builds
  • Approximately 20x faster transpilation with SWC (used by Rspack)
  • Faster development builds and CI runs

Bundler Switching Utility

The new bin/switch-bundler script allows easy switching between bundlers:

Features:

  • Updates shakapacker.yml configuration
  • Manages package.json dependencies
  • Supports npm, yarn, and pnpm
  • Auto-detects package manager from lock files

Usage:

bin/switch-bundler rspack   # Switch to Rspack
bin/switch-bundler webpack  # Switch to Webpack

Compatibility

  • ✅ Works with existing webpack configuration files (unified config approach)
  • ✅ Compatible with --typescript option
  • ✅ Compatible with --redux option
  • ✅ Supports all package managers (npm, yarn, pnpm)
  • ✅ Reversible via bin/switch-bundler script

Testing

  • All RuboCop checks pass with zero offenses
  • Follows existing generator patterns and conventions
  • Pre-commit hooks pass (prettier, rubocop, trailing newlines)

Documentation

See RSPACK_IMPLEMENTATION.md for detailed implementation documentation.

Test Plan

  • CI checks passing
  • Test generator with --rspack flag
  • Test generator with --rspack --typescript
  • Test generator with --rspack --redux
  • Test bin/switch-bundler utility
  • Verify rspack dependencies are installed correctly
  • Verify shakapacker.yml is configured correctly

🤖 Generated with Claude Code


This change is Reviewable

Summary by CodeRabbit

  • New Features

    • Added Rspack support via a new --rspack option in the installer and generators.
    • Automatic configuration updates to use Rspack with appropriate loader settings.
    • Conditional installation of Rspack production and development dependencies.
    • New bin/switch-bundler script to toggle between Webpack and Rspack, with auto package manager detection (npm, yarn, pnpm).
  • Documentation

    • Added guidance on generating projects with Rspack, switching bundlers, configuration changes, dependency differences, performance notes, and compatibility with TypeScript and Redux.

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📥 Commits

Reviewing files that changed from the base of the PR and between 52c85c6 and 4aa0506.

📒 Files selected for processing (7)
  • RSPACK_IMPLEMENTATION.md (1 hunks)
  • lib/generators/react_on_rails/base_generator.rb (3 hunks)
  • lib/generators/react_on_rails/install_generator.rb (4 hunks)
  • lib/generators/react_on_rails/templates/base/base/bin/switch-bundler (1 hunks)
  • lib/generators/react_on_rails/templates/base/base/config/webpack/development.js.tt (1 hunks)
  • lib/generators/react_on_rails/templates/base/base/config/webpack/serverWebpackConfig.js.tt (2 hunks)
  • spec/react_on_rails/generators/install_generator_spec.rb (1 hunks)

Walkthrough

Adds an Rspack option to React on Rails generators, conditionally configures Shakapacker for Rspack with SWC, installs appropriate Rspack dependencies, and introduces a bin/switch-bundler script to toggle between Webpack and Rspack, updating config and JS deps. Documentation describes usage, configuration, and dependency changes.

Changes

Cohort / File(s) Summary
Generators: options & config flow
lib/generators/react_on_rails/base_generator.rb, lib/generators/react_on_rails/install_generator.rb
Adds --rspack option, propagates it to base generator, updates config/shakapacker.yml (sets assets_bundler: rspack, webpack_loader: swc), and conditionally installs Rspack vs Webpack dev plugins and dependencies.
Bundler switch utility
lib/generators/react_on_rails/templates/base/base/bin/switch-bundler
New script to switch bundlers post-install: validates target, edits shakapacker.yml, removes/installs opposing deps in package.json, detects package manager (yarn/pnpm/npm), and runs installs.
Documentation
RSPACK_IMPLEMENTATION.md
Documents the Rspack integration, generator option, dependency sets, config changes, switch script usage, and compatibility notes.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  participant Dev as Developer
  participant InstallGen as InstallGenerator
  participant BaseGen as BaseGenerator
  participant FS as Filesystem
  participant PkgMgr as Package Manager

  Dev->>InstallGen: run react_on_rails:install --rspack
  InstallGen->>InstallGen: select deps (Rspack vs Webpack)
  InstallGen->>PkgMgr: install deps/devDeps (Rspack set)
  InstallGen->>BaseGen: invoke with rspack: true
  BaseGen->>FS: copy Shakapacker config
  BaseGen->>FS: update shakapacker.yml (assets_bundler=rspack, webpack_loader=swc)
  BaseGen-->>Dev: generator completed
Loading
sequenceDiagram
  autonumber
  participant Dev as Developer
  participant Script as bin/switch-bundler
  participant FS as Filesystem
  participant PkgMgr as Package Manager

  Dev->>Script: bin/switch-bundler rspack|webpack
  Script->>Script: validate target bundler
  Script->>FS: update shakapacker.yml (assets_bundler, webpack_loader)
  Script->>FS: modify package.json deps/devDeps
  Script->>PkgMgr: detect yarn/pnpm/npm
  Script->>PkgMgr: install updated dependencies
  Script-->>Dev: print next steps
Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related issues

Possibly related PRs

Suggested reviewers

  • alexeyr-ci

Poem

I hop through configs, swift and keen,
Flip webpack, rspack—nice and clean.
SWC winds hum, manifests glow,
A switcher script says: “tap and go!”
In bundles bright, my carrots gleam 🥕✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)
Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. You can run @coderabbitai generate docstrings to improve docstring coverage.
✅ Passed checks (2 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check ✅ Passed The title succinctly describes the addition of the new --rspack generator option, which is the primary change in this PR, and it clearly notes the intended benefit of faster builds.

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claude bot commented Oct 6, 2025

Code Review: Add --rspack generator option for faster builds

Summary

This PR adds a --rspack flag to enable Rspack bundler support. Overall, this is a well-structured and valuable feature that follows existing patterns. However, there are several issues that need to be addressed before merging.

Critical Issues

1. Security Vulnerability: YAML.load_file usage

Location: lib/generators/react_on_rails/templates/base/base/bin/switch-bundler:50

YAML.load_file is unsafe and can execute arbitrary code. Use YAML.safe_load_file instead with permitted_classes parameter.

2. Missing JSON require

Location: lib/generators/react_on_rails/templates/base/base/bin/switch-bundler:73

The script uses JSON.parse but doesn't require the JSON library. Add require json at the top.

3. Fragile Regex-Based YAML Manipulation

Location: lib/generators/react_on_rails/base_generator.rb:416-418

The regex assumes source_path is always the first key after default: and will fail silently if the YAML structure is different. Better approach: Parse YAML, modify the hash, and write it back using YAML.safe_load_file.

4. Inconsistent YAML Handling

The switch-bundler script properly parses YAML but base_generator.rb uses regex string manipulation. This inconsistency is error-prone.

High Priority Issues

5. Missing Test Coverage

I searched the spec directory and found NO tests for the new --rspack flag. The existing generator has comprehensive tests for --redux and --typescript, so this feature should have similar coverage including:

  • Generator with --rspack flag sets correct shakapacker.yml values
  • Generator with --rspack installs correct npm dependencies
  • Generator with --rspack --typescript works correctly
  • Generator with --rspack --redux works correctly
  • bin/switch-bundler script functionality

6. No Validation of Existing assets_bundler Setting

The code checks if assets_bundler exists but doesn't handle the case where it is already set to something else. The gsub on line 422 will replace ALL webpack_loader occurrences, potentially breaking existing configuration.

7. Missing Error Handling in switch-bundler

The script aborts after installing dependencies but before dev dependencies, leaving the system in an inconsistent state if the first command succeeds but the second fails.

Suggestions

8. Code Quality: Duplication

The pattern for installing dependencies is repeated multiple times. Consider extracting to a helper method.

9. User Experience: Add Warning When Switching

The switch-bundler script should warn users about potential breaking changes and ask for confirmation.

10. Documentation: Missing CHANGELOG Entry

A feature of this significance should have a CHANGELOG entry.

What is Done Well

  1. Excellent documentation - RSPACK_IMPLEMENTATION.md is thorough
  2. Follows existing patterns - Uses same structure as typescript/redux options
  3. Comprehensive PR description - Clear summary with examples
  4. Utility script - The bin/switch-bundler is a great UX addition
  5. Backward compatible - Does not break existing webpack usage
  6. Clear naming - Option name is intuitive

Priority Recommendations

Must fix before merge:

  1. Security issue - YAML.load_file
  2. Missing JSON require
  3. Add test coverage

Should fix before merge:
4. Replace regex YAML manipulation with proper parsing
5. Add validation for existing settings
6. Improve error handling

Great work on this feature! The performance improvements from Rspack are significant. Please address the critical security and testing issues before merging.

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Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between c3ad7a9 and 52c85c6.

📒 Files selected for processing (4)
  • RSPACK_IMPLEMENTATION.md (1 hunks)
  • lib/generators/react_on_rails/base_generator.rb (3 hunks)
  • lib/generators/react_on_rails/install_generator.rb (4 hunks)
  • lib/generators/react_on_rails/templates/base/base/bin/switch-bundler (1 hunks)
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{Gemfile,Rakefile,config.ru,**/*.{rb,rake,gemspec,ru}}

📄 CodeRabbit inference engine (CLAUDE.md)

{Gemfile,Rakefile,config.ru,**/*.{rb,rake,gemspec,ru}}: All Ruby code must pass RuboCop with zero offenses before commit/push
RuboCop is the sole authority for Ruby file formatting; never manually format Ruby files

Files:

  • lib/generators/react_on_rails/install_generator.rb
  • lib/generators/react_on_rails/base_generator.rb
**/*.{js,jsx,ts,tsx,css,scss,json,yml,yaml,md}

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Files:

  • RSPACK_IMPLEMENTATION.md
🧬 Code graph analysis (2)
lib/generators/react_on_rails/install_generator.rb (2)
lib/generators/react_on_rails/generator_helper.rb (1)
  • add_npm_dependencies (23-39)
lib/generators/react_on_rails/base_generator.rb (2)
  • handle_npm_failure (248-260)
  • add_dev_dependencies (207-217)
lib/generators/react_on_rails/base_generator.rb (1)
lib/react_on_rails/packer_utils.rb (1)
  • shakapacker_version (15-19)
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (12)
  • GitHub Check: dummy-app-integration-tests (3.2, 20)
  • GitHub Check: dummy-app-integration-tests (3.4, 22)
  • GitHub Check: claude-review
  • GitHub Check: rspec-package-tests (3.4, latest)
  • GitHub Check: rspec-package-tests (3.4, minimum)
  • GitHub Check: rspec-package-tests (3.2, latest)
  • GitHub Check: rspec-package-tests (3.2, minimum)
  • GitHub Check: examples (3.2, minimum)
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🔇 Additional comments (15)
lib/generators/react_on_rails/base_generator.rb (2)

22-26: LGTM!

The rspack option follows the established pattern for generator options and is clearly documented.


91-91: LGTM!

The conditional calls to configure_rspack_in_shakapacker are correctly placed to handle both fresh Shakapacker installations and existing configurations.

Also applies to: 99-99

RSPACK_IMPLEMENTATION.md (1)

1-141: LGTM!

The documentation is comprehensive, accurate, and well-structured. It clearly explains the implementation, usage, configuration changes, and benefits of the rspack option.

lib/generators/react_on_rails/install_generator.rb (5)

31-35: LGTM!

The rspack option definition is consistent with other generator options and clearly documented.


82-83: LGTM!

The rspack option is correctly propagated to the base generator alongside other options.


434-434: LGTM!

The conditional call to add_rspack_dependencies is correctly placed in the dependency installation flow.


500-514: LGTM!

The add_rspack_dependencies method follows the established pattern for dependency installation with proper error handling and fallback mechanisms.


516-538: Do not update BaseGenerator for rspack logic

InstallGenerator defines and uses its own add_dev_dependencies (and does not inherit from BaseGenerator), so BaseGenerator’s hard-coded Webpack deps aren’t invoked here.

Likely an incorrect or invalid review comment.

lib/generators/react_on_rails/templates/base/base/bin/switch-bundler (7)

9-17: LGTM!

The dependency constants accurately reflect the packages needed for each bundler and match the documented dependencies in RSPACK_IMPLEMENTATION.md.


19-44: LGTM!

The initialization and validation logic is straightforward and provides clear error messages for invalid input.


46-61: LGTM!

The YAML configuration update uses proper parsing with YAML.load_file and YAML.dump, which is more robust than string manipulation. This is the correct approach.


64-87: LGTM!

The dependency removal logic correctly identifies and removes the opposing bundler's packages from both dependencies and devDependencies, with appropriate error handling.


91-123: LGTM!

The dependency installation logic correctly detects the package manager and constructs appropriate commands for each, with proper error handling.


126-131: LGTM!

The package manager detection logic is consistent with the pattern used in the install generator.


135-143: LGTM!

The main execution block provides clear usage instructions and properly invokes the bundler switcher.

Comment on lines +404 to +426
8000
def configure_rspack_in_shakapacker
shakapacker_config_path = "config/shakapacker.yml"
return unless File.exist?(shakapacker_config_path)

puts Rainbow("🔧 Configuring Shakapacker for Rspack...").yellow

# Read the current config
config_content = File.read(shakapacker_config_path)

# Update assets_bundler to rspack in default section
unless config_content.include?("assets_bundler:")
# Add assets_bundler after source_path in default section
config_content.gsub!(/^default: &default\n(\s+source_path:.*\n)/) do
"default: &default\n#{Regexp.last_match(1)} assets_bundler: 'rspack'\n"
end
end

# Update webpack_loader to swc (rspack works best with SWC)
config_content.gsub!(/^\s*webpack_loader:.*$/, " webpack_loader: 'swc'")

File.write(shakapacker_config_path, config_content)
puts Rainbow("✅ Updated shakapacker.yml for Rspack").green
end
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⚠️ Potential issue | 🟠 Major

Refactor to use YAML parsing instead of string manipulation.

The current implementation uses string manipulation (regex and gsub!) on YAML content, which is fragile and error-prone. This approach has several issues:

  1. Line 414: The unless config_content.include?("assets_bundler:") check won't update an existing assets_bundler setting (e.g., if it's already set to 'webpack').
  2. Lines 416-418: The regex assumes specific whitespace formatting and may not match variations.
  3. Line 422: The gsub!(/^\s*webpack_loader:.*$/, ...) updates ALL occurrences globally, not just in the default section, which could affect environment-specific overrides.

Apply this diff to use proper YAML parsing:

 def configure_rspack_in_shakapacker
   shakapacker_config_path = "config/shakapacker.yml"
   return unless File.exist?(shakapacker_config_path)

   puts Rainbow("🔧 Configuring Shakapacker for Rspack...").yellow

-  # Read the current config
-  config_content = File.read(shakapacker_config_path)
-
-  # Update assets_bundler to rspack in default section
-  unless config_content.include?("assets_bundler:")
-    # Add assets_bundler after source_path in default section
-    config_content.gsub!(/^default: &default\n(\s+source_path:.*\n)/) do
-      "default: &default\n#{Regexp.last_match(1)}  assets_bundler: 'rspack'\n"
-    end
-  end
-
-  # Update webpack_loader to swc (rspack works best with SWC)
-  config_content.gsub!(/^\s*webpack_loader:.*$/, "  webpack_loader: 'swc'")
-
-  File.write(shakapacker_config_path, config_content)
+  # Parse YAML config
+  config = YAML.load_file(shakapacker_config_path)
+
+  # Update default section
+  config["default"] ||= {}
+  config["default"]["assets_bundler"] = "rspack"
+  config["default"]["webpack_loader"] = "swc"
+
+  # Write back as YAML
+  File.write(shakapacker_config_path, YAML.dump(config))
   puts Rainbow("✅ Updated shakapacker.yml for Rspack").green
 end

Note: This approach is already used correctly in the switch-bundler script (lines 50-59), so applying the same pattern here maintains consistency.

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
def configure_rspack_in_shakapacker
shakapacker_config_path = "config/shakapacker.yml"
return unless File.exist?(shakapacker_config_path)
puts Rainbow("🔧 Configuring Shakapacker for Rspack...").yellow
# Read the current config
config_content = File.read(shakapacker_config_path)
# Update assets_bundler to rspack in default section
unless config_content.include?("assets_bundler:")
# Add assets_bundler after source_path in default section
config_content.gsub!(/^default: &default\n(\s+source_path:.*\n)/) do
"default: &default\n#{Regexp.last_match(1)} assets_bundler: 'rspack'\n"
end
end
# Update webpack_loader to swc (rspack works best with SWC)
config_content.gsub!(/^\s*webpack_loader:.*$/, " webpack_loader: 'swc'")
File.write(shakapacker_config_path, config_content)
puts Rainbow("✅ Updated shakapacker.yml for Rspack").green
end
def configure_rspack_in_shakapacker
shakapacker_config_path = "config/sh 8000 akapacker.yml"
return unless File.exist?(shakapacker_config_path)
puts Rainbow("🔧 Configuring Shakapacker for Rspack...").yellow
# Parse YAML config
config = YAML.load_file(shakapacker_config_path)
# Update default section
config["default"] ||= {}
config["default"]["assets_bundler"] = "rspack"
config["default"]["webpack_loader"] = "swc"
# Write back as YAML
File.write(shakapacker_config_path, YAML.dump(config))
puts Rainbow("✅ Updated shakapacker.yml for Rspack").green
end

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claude bot commented Oct 7, 2025

Code Review: PR #1852 - Add --rspack generator option for faster builds

📋 Summary

This PR adds Rspack bundler support to React on Rails generators, providing a faster alternative to Webpack. The implementation is well-structured and follows existing patterns, but there are several areas that need attention before merging.


✅ Strengths

  1. Excellent documentation: RSPACK_IMPLEMENTATION.md is comprehensive and clear
  2. Consistent with existing patterns: Follows the same structure as other generator options (--redux, --typescript)
  3. Reversible design: The bin/switch-bundler script allows easy switching between bundlers
  4. Good separation of concerns: Changes are logically organized across install_generator.rb and base_generator.rb

🔴 Critical Issues

1. Missing rspack option in install_generator.rb line 127

File: lib/generators/react_on_rails/install_generator.rb:127

invoke "react_on_rails:base", [], { typescript: options.typescript?, redux: options.redux? }

This line is missing the rspack option that was added to the diff at line 82-83. The current code doesn't pass the rspack flag to the base generator, making the feature non-functional.

Expected:

invoke "react_on_rails:base", [], 
       { typescript: options.typescript?, redux: options.redux?, rspack: options.rspack? }

Impact: HIGH - The rspack option won't work without this fix


2. Missing rspack class option declaration

File: lib/generators/react_on_rails/install_generator.rb:31-35

The diff shows adding the --rspack class option, but it's missing from the actual file content at lines 31-35. Only --ignore-warnings is present.

Expected (after line 29):

# --rspack
class_option :rspack,
             type: :boolean,
             default: false,
             desc: "Use Rspack instead of Webpack as the bundler. Default: false"

Impact: HIGH - Without this declaration, the --rspack flag won't be recognized


3. Missing rspack option in base_generator.rb

File: lib/generators/react_on_rails/base_generator.rb:22

The diff shows adding the rspack class option at lines 22-26, but the actual file only shows the redux option at lines 15-20. The rspack option is missing entirely.

Expected (after line 20):

# --rspack
class_option :rspack,
             type: :boolean,
             default: false,
             desc: "Use Rspack instead of Webpack as the bundler"

Impact: HIGH - Base generator won't recognize the rspack option


4. Missing configure_rspack_in_shakapacker method

File: lib/generators/react_on_rails/base_generator.rb

The method configure_rspack_in_shakapacker is called at lines 85 and 92 but the method definition (shown in diff lines 404-426) is completely missing from the file.

Impact: CRITICAL - This will cause immediate runtime errors


5. Missing rspack dependency installation

File: lib/generators/react_on_rails/install_generator.rb:474-478

The add_js_dependencies method doesn't call add_rspack_dependencies as shown in the diff. The current implementation only calls:

add_react_on_rails_package
add_react_dependencies
add_css_dependencies
add_dev_dependencies

Expected (add after line 477):

add_rspack_dependencies if options.rspack?

Impact: HIGH - Rspack dependencies won't be installed


6. Missing add_rspack_dependencies method

File: lib/generators/react_on_rails/install_generator.rb

The add_rspack_dependencies method (diff lines 499-513) is completely missing from the file.

Impact: CRITICAL - Method not found error when rspack option is used


7. add_dev_dependencies not updated for rspack

File: lib/generators/react_on_rails/install_generator.rb:543-548

The current implementation always installs webpack dependencies, but according to the diff (lines 515-534), it should conditionally install rspack OR webpack dependencies based on the flag.

Current:

dev_deps = %w[
  @pmmmwh/react-refresh-webpack-plugin
  react-refresh
]

Expected:

dev_deps = if options.rspack?
             %w[
               @rspack/cli
               @rspack/plugin-react-refresh
               react-refresh
             ]
           else
             %w[
               @pmmmwh/react-refresh-webpack-plugin
               react-refresh
             ]
           end

Impact: HIGH - Will install wrong dependencies


⚠️ Major Issues

8. bin/switch-bundler script missing

The new executable script shown in the diff is not present in the repository. This needs to be added at:
lib/generators/react_on_rails/templates/base/base/bin/switch-bundler

Impact: MEDIUM - Feature advertised but not functional


9. No validation for conflicting webpack/rspack configs

The configure_rspack_in_shakapacker method unconditionally updates the config. If shakapacker.yml already has custom bundler settings, they'll be silently overwritten.

Recommendation: Add validation or user prompting similar to copy_webpack_main_config


🟡 Minor Issues

10. RSPACK_IMPLEMENTATION.md line references may be outdated

The documentation references specific line numbers (e.g., "line 31-35"), which will become outdated as the code changes.

Recommendation: Use method names or section references instead of line numbers


11. Package manager detection duplicated

The detect_package_manager logic in bin/switch-bundler duplicates the logic in install_js_dependencies. Consider extracting to a shared helper.


12. Missing error handling in switch-bundler

The script doesn't validate that package.json exists before attempting JSON parsing (though it does check and print a warning).

Recommendation: Add explicit error handling with abort for critical failures


🧪 Test Coverage Issues

13. No tests for rspack option

The test file spec/react_on_rails/generators/install_generator_spec.rb has no test contexts for:

  • --rspack
  • --rspack --typescript
  • --rspack --redux

Required tests:

context "with --rspack" do
  before(:all) { run_generator_test_with_args(%w[--rspack], package_json: true) }
  
  it "configures shakapacker for rspack" do
    assert_file "config/shakapacker.yml" do |content|
      expect(content).to match(/assets_bundler: 'rspack'/)
      expect(content).to match(/webpack_loader: 'swc'/)
    end
  end
  
  it "installs rspack dependencies" do
    # Verify package.json contains @rspack/core, etc.
  end
end

🔒 Security Considerations

No security issues identified

The code doesn't introduce:

  • Command injection vulnerabilities (uses proper array arguments for system calls)
  • Path traversal issues
  • Credential exposure
  • Malicious code execution

The bin/switch-bundler script properly escapes inputs and uses safe file operations.


🎯 Performance Considerations

Good: Rspack promises 20x performance improvement
Good: Conditional dependency installation reduces package bloat
⚠️ Note: SWC transpiler change (babel → swc) may have subtle differences in edge cases


📝 Code Quality

Style & Conventions

✅ Follows existing generator patterns
✅ Proper use of Rainbow for colored output
✅ Consistent with project's --typescript and --redux implementations
⚠️ CRITICAL: Must run bundle exec rubocop before committing (per CLAUDE.md)

Documentation

✅ Excellent RSPACK_IMPLEMENTATION.md
✅ Clear PR description with examples
✅ Helpful inline comments


🎬 Recommendations

Before Merging:

  1. Apply all critical fixes (issues TODO for first version #1-7)
  2. Add the bin/switch-bundler script (issue Port console polyfill from react-rails #8)
  3. Add comprehensive tests (issue Consider changing the name of the gem #13)
  4. Run bundle exec rubocop and fix all violations (per CLAUDE.md)
  5. Ensure all files end with newline (per CLAUDE.md)
  6. Test the generator manually with all option combinations:
    • --rspack
    • --rspack --typescript
    • --rspack --redux
    • --rspack --typescript --redux
  7. Test bin/switch-bundler in both directions (webpack→rspack, rspack→webpack)

Nice to Have:

  1. Consider adding a warning when switching bundlers about potential webpack config incompatibilities
  2. Add example output/screenshots to RSPACK_IMPLEMENTATION.md
  3. Update main README.md to mention rspack option

🎓 Overall Assessment

Concept: ⭐⭐⭐⭐⭐ Excellent addition that provides real value
Implementation: ⭐⭐⭐☆☆ Good design, but incomplete/missing critical code
Testing: ⭐⭐☆☆☆ No tests for new functionality
Documentation: ⭐⭐⭐⭐⭐ Outstanding

Status: ❌ Not ready to merge - Critical code is missing from the actual files despite being in the diff

The diff shows all the right changes, but they don't appear to be applied to the actual files. Please verify the commit and ensure all changes are properly staged and committed.


Review generated with Claude Code - Following React on Rails conventions from CLAUDE.md

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claude bot commented Oct 7, 2025

Code Review for PR #1852: Add --rspack generator option

I've reviewed this PR and here's my comprehensive feedback:

✅ Strengths

  1. Clean Architecture - The implementation follows existing generator patterns well, maintaining consistency with the --redux and --typescript options.

  2. Good Documentation - The RSPACK_IMPLEMENTATION.md provides excellent implementation details and usage examples.

  3. Reversibility - The bin/switch-bundler script is a thoughtful addition that allows users to switch between bundlers post-installation.

  4. Conditional Logic - Proper conditional dependency installation prevents unnecessary packages from being added.

🐛 Potential Issues

1. YAML Regex Pattern Issue (base_generator.rb:416-418)

The regex assumes source_path is always the first line after default: &default, which may not be true.

Recommendation: Use YAML parsing instead of regex for safer manipulation.

2. Missing Error Handling (base_generator.rb:404-426)

The configure_rspack_in_shakapacker method doesn't handle cases where the regex match fails, YAML structure is unexpected, or file write operations fail.

3. Incomplete JSON Require (bin/switch-bundler:72)

Missing require 'json' at the top of the file.

4. Webpack Dependencies Still Installed

When using --rspack, the code doesn't prevent webpack dependencies from being installed by Shakapacker.

🧪 Test Coverage Concerns

CRITICAL: No automated tests were added for the new --rspack option. Tests should be added to spec/react_on_rails/generators/install_generator_spec.rb similar to existing tests for --redux and --typescript.

🎯 Before Merging

Per CLAUDE.md requirements:

  • ✅ Run bundle exec rubocop
  • ⚠️ Add automated tests for the new feature (CRITICAL)
  • ⚠️ Test combinations: --rspack --typescript, --rspack --redux, --rspack --redux --typescript

Summary

This is a solid implementation that follows the project's conventions well. Main concerns:

  1. Missing test coverage (critical)
  2. YAML manipulation fragility (medium priority)
  3. Missing JSON require in switch-bundler (quick fix)

Once tests are added and the YAML handling is improved, this will be ready to merge!

🤖 Generated with Claude Code

justin808 and others added 2 commits October 6, 2025 22:10
Implements --rspack flag for react_on_rails:install generator to use
Rspack bundler instead of Webpack, providing ~20x faster builds.

## Changes
- Added --rspack option to install_generator.rb and base_generator.rb
- Conditional dependency installation (rspack vs webpack packages)
- Auto-configures shakapacker.yml for rspack with SWC transpiler
- Created bin/switch-bundler utility to switch bundlers post-install

## Key Features
- Rspack packages: @rspack/core, @rspack/cli, @rspack/plugin-react-refresh
- Compatible with --typescript and --redux options
- Reversible via bin/switch-bundler script
- Supports npm, yarn, and pnpm package managers

## Usage
rails generate react_on_rails:install --rspack
bin/switch-bundler rspack  # Switch existing app

Based on patterns from react_on_rails-demos PR #20

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
Implements unified configuration approach where the same webpack config
files work with both webpack and rspack bundlers, based on the
assets_bundler setting in shakapacker.yml.

## Changes

**development.js.tt**:
- Add config import from shakapacker to access assets_bundler setting
- Conditional React Refresh plugin loading:
  - Rspack: @rspack/plugin-react-refresh
  - Webpack: @pmmmwh/react-refresh-webpack-plugin
- Prevents "window not found" errors when using rspack

**serverWebpackConfig.js.tt**:
- Replace hardcoded webpack require with bundler variable
- Bundler conditionally requires @rspack/core or webpack
- Use bundler.optimize.LimitChunkCountPlugin instead of webpack-specific
- Eliminates warnings about webpack when using rspack

**RSPACK_IMPLEMENTATION.md**:
- Document webpack config template changes
- Explain unified configuration approach

## Benefits

- Single set of config files works for both bundlers
- No warnings when using rspack about webpack.config.js
- Seamless switching between bundlers via bin/switch-bundler
- Follows pattern from react_on_rails-demos PR #20

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@justin808 justin808 force-pushed the justin808/rspack-generator-option branch from 0cee9aa to 5006113 Compare October 7, 2025 08:10
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claude bot commented Oct 7, 2025

Pull Request Review: Add --rspack generator option

Summary

This PR adds support for Rspack bundler as an alternative to Webpack. The implementation is well-structured and follows existing patterns. Overall, this is a solid contribution with good documentation.

Strengths

  • Excellent consistency with existing generator patterns
  • Clean separation of concerns - Rspack logic properly isolated
  • Good error handling in switch-bundler script
  • Well documented with RSPACK_IMPLEMENTATION.md
  • Smart unified config approach for both bundlers
  • Reversible design via bin/switch-bundler utility

Critical Issues

1. Missing JSON require in switch-bundler (line 73)

  • Uses JSON.parse without requiring json library
  • Will fail with NameError when parsing package.json
  • Fix: Add require json at top of file

2. Regex fragility in configure_rspack_in_shakapacker (base_generator.rb:416-418)

  • Assumes specific YAML formatting with exact whitespace
  • Will silently fail if shakapacker.yml format differs
  • Recommendation: Use YAML.load_file/YAML.dump instead of regex manipulation

3. Code duplication

  • Dependency lists duplicated between install_generator.rb and switch-bundler
  • Risk: Lists can get out of sync during maintenance
  • Extract to shared constant or config file

Medium Priority Issues

4. Missing test coverage

  • install_generator_spec.rb has no tests for --rspack option
  • Add test contexts similar to existing --redux and --typescript tests

5. Defensive plugin loading

  • development.js.tt assumes packages are installed
  • Add try-catch for better error messages

Security & Performance

  • No security concerns identified
  • Performance looks good
  • No regressions introduced

Action Items Before Merge

Must Fix:

  • Add require json to switch-bundler
  • Rewrite configure_rspack_in_shakapacker to use YAML parsing

Should Fix:

  • Add test coverage for --rspack option
  • Extract shared dependency lists

Overall Assessment

Rating: Strong Approve (after addressing critical issues)

Well-designed feature with clear value. The two critical issues must be fixed but are straightforward. Once addressed this will be a great addition.


Generated with Claude Code

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claude bot commented Oct 7, 2025

Code Review for PR 1852

I have reviewed this PR implementing the rspack option. This is a well-structured implementation.

Strengths

  1. Excellent code organization following existing patterns
  2. Good documentation with comprehensive RSPACK_IMPLEMENTATION.md
  3. Smart unified config approach
  4. Reversible with bin/switch-bundler script

Critical Issues

Missing JSON Require - HIGH PRIORITY

bin/switch-bundler uses JSON.parse without requiring json library

No Test Coverage - HIGH PRIORITY

No automated tests included for rspack option

File Permissions - MEDIUM

bin/switch-bundler needs executable permissions

Recommendations

Add automated tests for:

  • rspack flag alone
  • rspack with typescript
  • rspack with redux
  • bin/switch-bundler copy and permissions

Priority fixes: JSON require, executable permissions, test coverage

Overall solid implementation - request changes for critical fixes then approve.

Adds comprehensive test coverage for the --rspack generator option:

## New Test Contexts

**with --rspack**:
- Verifies base generator and non-redux generator behavior
- Tests bin/switch-bundler script creation
- Validates rspack dependencies in package.json
- Ensures webpack dependencies are NOT installed
- Checks unified webpack config with bundler detection
- Verifies server webpack config uses bundler variable

**with --rspack --typescript**:
- Tests combination of rspack and typescript options
- Verifies TypeScript component file creation (.tsx)
- Validates tsconfig.json generation
- Checks both rspack and typescript dependencies installed
- Ensures TypeScript typing is correct

## Test Coverage

19 new examples added, all passing:
- Dependency management (rspack vs webpack packages)
- Webpack configuration templates (bundler detection)
- TypeScript integration with rspack
- bin/switch-bundler utility script

## Validation

All specs pass successfully with 0 failures.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
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claude bot commented Oct 7, 2025

Code Review: Rspack Generator Option

This is a well-structured PR. Here is my review:

Strengths

  1. Excellent code organization with clean separation between rspack and webpack dependencies
  2. Good documentation in RSPACK_IMPLEMENTATION.md
  3. Unified configuration approach with smart bundler detection
  4. Excellent test coverage for main scenarios

Critical Issues

1. YAML Regex Fragility (base_generator.rb:416-418)

The regex pattern for inserting assets_bundler is brittle and assumes source_path is always first. Use YAML parser instead for reliability.

2. Switch-Bundler Script Lacks Safety (bin/switch-bundler:87-121)

Script modifies package.json without backup or rollback. Add backup before modification.

Medium Priority Issues

  1. Missing edge case handling for webpack already configured with SWC
  2. JSON.pretty_generate may cause formatting diffs - add note to run rake autofix
  3. Missing require json in switch-bundler script

Low Priority Issues

  1. Duplicate react-refresh in dev dependencies
  2. Test does not verify bin/switch-bundler is executable
  3. Unnecessary file operations in configure_rspack_in_shakapacker

Security

Good security practices overall. Consider validating package manager exists before running system commands.

Test Coverage

Excellent coverage for main scenarios. Missing: --rspack --redux tests, shakapacker.yml YAML validation, switch-bundler functionality tests, error handling tests.

Summary

High-quality work! Main recommendation: Address YAML parsing fragility before merging. Other issues can be follow-ups.

Review following CLAUDE.md guidelines.

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claude bot commented Oct 7, 2025

Code Review - PR #1852: Add --rspack generator option

Overall, this is a well-structured implementation that adds Rspack support. The code follows existing patterns and provides good documentation.

Strengths

  1. Excellent documentation in RSPACK_IMPLEMENTATION.md
  2. Follows existing generator conventions consistently
  3. Good test coverage for various flag combinations
  4. Smart unified configuration with conditional bundler detection
  5. Great UX with the bin/switch-bundler utility
  6. RuboCop compliance - all checks passing

Critical Issues - Must Fix Before Merge

1. Missing require json in switch-bundler
File: lib/generators/react_on_rails/templates/base/base/bin/switch-bundler:74
The script uses JSON.parse without requiring json library. Add: require "json"

2. Command injection vulnerability in switch-bundler
File: lib/generators/react_on_rails/templates/base/base/bin/switch-bundler:118-134
Using system() with string interpolation is vulnerable. Use array form: system("yarn", "add", *deps[:dependencies])
Apply to ALL system() calls in the script.

3. YAML formatting issue
File: lib/generators/react_on_rails/base_generator.rb:418
Using YAML.dump can break formatting and anchors. Consider direct string manipulation instead.

Additional Suggestions

  • Add tests for switch-bundler script functionality
  • Extract magic strings to constants (rspack, webpack, swc, babel)
  • Add user warnings when config files are missing
  • Verify css-minimizer-webpack-plugin compatibility with Rspack
  • Consider adding CI test matrix for --rspack flag

Verdict

Great work! The unified config approach is well thought out. Please address the 3 critical security/bug issues above before merging.

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