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@justin808 justin808 commented Oct 11, 2025

Summary

Adds automatic AI analysis prompt generation to the bin/export-bundler-config --doctor command. This creates an AI-ANALYSIS-PROMPT.md file alongside exported configurations, providing comprehensive instructions for AI assistants to analyze webpack/rspack configs.

Key Improvements

  • AI-Powered Configuration Analysis: Users can now get intelligent feedback on their bundler configurations by copying the prompt + exported configs to ChatGPT, Claude, Gemini, etc.
  • Comprehensive Analysis Framework: The prompt guides AI to check for migration issues, build errors, optimization opportunities, and best practices
  • React on Rails Context: Includes specific guidance for React on Rails standard configuration patterns (client/server bundles, SSR setup, etc.)

What's Included in the AI Prompt

The generated prompt instructs AI to analyze:

  1. Migration Issues: webpack ↔ rspack compatibility, deprecated options, equivalent replacements
  2. Build Errors & Warnings: Configuration problems that cause build failures
  3. Client vs Server Optimization: Bundle-specific optimizations for browser vs SSR
  4. Development vs Production: Environment-specific settings (HMR, minification, source maps, etc.)
  5. Best Practices: Caching, loaders, plugins, module resolution

Example Output

When running bin/export-bundler-config --doctor, you now get:

Configuration Files:
  ✓ webpack-development-client.yaml
  ✓ webpack-development-server.yaml
  ✓ webpack-production-client.yaml
  ✓ webpack-production-server.yaml

AI Analysis:
  🤖 AI-ANALYSIS-PROMPT.md - Use this prompt to get AI recommendations
     Copy the contents and paste into an AI assistant for configuration analysis

Test Plan

  • All existing tests pass
  • New comprehensive test suite for AiPromptGenerator (11 tests)
  • Linter passes
  • TypeScript type check passes
  • Verified prompt generation in doctor mode
  • Updated troubleshooting documentation

Breaking Changes

None - this is purely additive functionality.

Security Implications

None - generates documentation files only, no code execution or external dependencies.

Summary by CodeRabbit

  • New Features

    • Doctor/export now generates an AI analysis prompt file (AI-ANALYSIS-PROMPT.md) alongside exported configs and includes it in the output.
  • CLI

    • Summary output clarified: adjusted file counts, renamed sections, and a new "AI Analysis" section with the prompt path and usage note.
  • Documentation

    • Troubleshooting updated to document the AI prompt artifact, its purpose, analysis areas, and how to use exported artifacts with AI tools.
  • Refactor

    • Public type declarations consolidated into a single default export object, altering the public API surface.
  • Tests

    • Added tests covering AI prompt generation, bundler-specific content, and optional context inclusion.

When running `bin/export-bundler-config --doctor`, the tool now generates
an AI-ANALYSIS-PROMPT.md file alongside the exported configuration files.

This prompt file provides comprehensive instructions for AI assistants to
analyze webpack/rspack configurations and suggest improvements. It includes:

- Context about the exported configuration files
- React on Rails standard configuration patterns
- Analysis objectives covering:
  * Migration issues (webpack ↔ rspack)
  * Build errors and warnings
  * Client vs server optimizations
  * Development vs production optimizations
  * Best practices and performance improvements
- Instructions for providing additional context (build logs, custom configs)
- Desired output format specification

The prompt is designed to help developers get actionable feedback from AI
tools (ChatGPT, Claude, Gemini, etc.) when troubleshooting or optimizing
their bundler configurations.

Changes:
- Add AiPromptGenerator class in package/configExporter/aiPromptGenerator.ts
- Integrate prompt generation into doctor mode in cli.ts
- Export AiPromptGenerator from configExporter/index.ts
- Add comprehensive test suite for AI prompt generation
- Update troubleshooting.md documentation
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coderabbitai bot commented Oct 11, 2025

Walkthrough

Adds an AI prompt generator and integrates it into the config-export "doctor" flow: generates AI-ANALYSIS-PROMPT.md alongside exported files, updates CLI output to include the artifact, re-exports the generator, adds tests, updates docs, and changes the package public TypeScript declaration export shape.

Changes

Cohort / File(s) Summary
Documentation
docs/troubleshooting.md
Documents that AI-ANALYSIS-PROMPT.md is produced by --doctor, describes the prompt's purpose, analysis areas, contents, and how to use the exported prompt with AI tools.
Config Exporter: AI prompt & CLI integration
package/configExporter/aiPromptGenerator.ts, package/configExporter/cli.ts, package/configExporter/index.ts, test/package/configExporter/aiPromptGenerator.test.js
Adds AiPromptGenerator class (builds Markdown prompt; generatePromptFilename()), integrates prompt generation and bundler detection into CLI doctor/save flow, writes the prompt file and appends it to created files, re-exports the generator, and adds tests validating prompt content and options.
Public API Typings
package/index.d.ts
Replaces prior interface-based export with a unified default export object _default, alters exported shape and signatures (e.g., generateWebpackConfig), and changes module export to export = _default.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor User
  participant CLI as configExporter/cli
  participant Exporter as Config Exporter
  participant Prompt as AiPromptGenerator
  participant FS as File System

  User->>CLI: run doctor/export (--doctor)
  CLI->>Exporter: export config files
  Exporter-->>CLI: createdFiles + metadata (bundler)
  CLI->>Prompt: generatePrompt(createdFiles, targetDir, bundler, includeRoRctx)
  Prompt-->>CLI: "AI-ANALYSIS-PROMPT.md" (markdown content)
  CLI->>FS: write "AI-ANALYSIS-PROMPT.md" to disk
  FS-->>CLI: path
  CLI-->>User: summary (created files, Configuration Files:, AI Analysis:)
Loading

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

Suggested reviewers

  • tomdracz
  • G-Rath

Poem

A rabbit hops through config stacks,
I nibble prompts and leave no tracks.
AI-ANALYSIS lights the way,
Carrots of insight saved today.
Hop, inspect, and bounce away! 🐇✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check ✅ Passed The title clearly describes the main change, namely adding an AI analysis prompt generator to the config exporter, and succinctly captures the primary functionality introduced in this PR.
Docstring Coverage ✅ Passed No functions found in the changes. Docstring coverage check skipped.
✨ Finishing touches
  • 📝 Generate docstrings
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Post copyable unit tests in a comment
  • Commit unit tests in branch create-ai-prompt-to-analyze-webpack-output

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Review profile: CHILL

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Reviewing files that changed from the base of the PR and between 3e4cb9f and 476866c.

📒 Files selected for processing (1)
  • package/configExporter/aiPromptGenerator.ts (1 hunks)
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**/*

📄 CodeRabbit inference engine (CLAUDE.md)

End every file with a trailing newline character

Files:

  • package/configExporter/aiPromptGenerator.ts
🧬 Code graph analysis (1)
package/configExporter/aiPromptGenerator.ts (2)
package/configExporter/index.ts (1)
  • AiPromptGenerator (5-5)
lib/shakapacker/configuration.rb (1)
  • bundler (108-110)
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🔇 Additional comments (2)
package/configExporter/aiPromptGenerator.ts (2)

18-322: LGTM! Well-structured prompt generation logic.

The generatePrompt method is well-organized and comprehensive:

  • Clear section-based structure for the AI prompt.
  • Conditional logic properly handles different file variants (development/production, client/server).
  • React on Rails context is appropriately guarded by the includeReactOnRailsContext flag.
  • Markdown formatting is consistent throughout.

330-330: Trailing newline confirmed—no action needed.


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claude bot commented Oct 11, 2025

Pull Request Review: AI Analysis Prompt Generator

Summary

This PR adds a helpful AI analysis prompt generator to the config exporter's --doctor mode. The implementation is well-structured and thoroughly tested. Overall, this is a solid contribution that adds value to the troubleshooting workflow.

Strengths

Code Quality

  • Clean architecture: The AiPromptGenerator class is well-designed with a single responsibility
  • Comprehensive tests: 11 test cases provide excellent coverage (test/package/configExporter/aiPromptGenerator.test.js:1-186)
  • Good TypeScript practices: Proper type annotations and clear method signatures
  • Maintainable code: The prompt generation uses a clean sections.push() pattern

Implementation Details

  • Non-breaking change: Purely additive functionality
  • Thoughtful UX: Console output clearly separates config files from AI prompt (cli.ts:272-288)
  • Flexible design: The includeReactOnRailsContext parameter allows customization

Documentation

  • Well-documented: Clear JSDoc comments
  • Updated docs: The troubleshooting.md file was properly updated

@claude
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claude bot commented Oct 11, 2025

Issues and Recommendations

1. CRITICAL: Missing Trailing Newline

File: package/configExporter/aiPromptGenerator.ts:277

The file is missing a trailing newline after line 276. According to CLAUDE.md line 5, this is required by the project's linting rules.

Fix: Add a newline after line 276


2. index.d.ts Changes Appear Unrelated

File: package/index.d.ts

The changes to this file seem to be a complete rewrite unrelated to the AI prompt feature:

  • Removal of detailed JSDoc comments
  • Simplified type definitions
  • Addition of default export alias

Questions: Were these changes intentional? If unrelated, they should be reverted or split into a separate PR.


3. Minor: Unused Import

File: package/configExporter/aiPromptGenerator.ts:2

The ConfigMetadata type is imported but never used. This will cause linting warnings.

Fix: Remove the unused import

@claude
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claude bot commented Oct 11, 2025

4. Enhancement: Type Safety for Bundler Parameter

File: package/configExporter/aiPromptGenerator.ts:18-22

The bundler parameter is typed as string, but should be "webpack" | "rspack" for better type safety.


5. Code Style: String Concatenation

File: package/configExporter/aiPromptGenerator.ts:157-161

Multi-line string concatenation could be cleaner by joining the two sections.push() calls into one.


6. Testing: Consider Edge Cases

File: test/package/configExporter/aiPromptGenerator.test.js

The tests are comprehensive, but consider adding tests for:

  • Empty exportedFiles array
  • Invalid/malformed filenames
  • Very long directory paths
  • Special characters in paths

@claude
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claude bot commented Oct 11, 2025

Security, Performance, and Testing

Security Review

No security concerns identified:

  • No external API calls
  • No code execution
  • Only generates static markdown files
  • No sensitive data exposure

Performance Considerations

No performance concerns:

  • Minimal overhead (simple string concatenation)
  • Only runs in --doctor mode (opt-in)
  • No blocking operations or heavy computation

Test Coverage Assessment

Coverage: Excellent

The test suite covers:

  • Filename generation
  • Full prompt structure for both webpack and rspack
  • File listing logic
  • Partial file lists
  • React on Rails context inclusion/exclusion
  • All major prompt sections
  • Footer metadata

Missing coverage (nice-to-have):

  • Edge cases (empty arrays, special chars)
  • Date formatting verification
  • Very long file lists (100+ files)

@claude
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claude bot commented Oct 11, 2025

Checklist Before Merge

  • Fix missing trailing newline in aiPromptGenerator.ts
  • Resolve or explain the index.d.ts changes
  • Remove unused ConfigMetadata import
  • Run yarn lint to catch any linting issues
  • Verify tests pass with yarn test
  • Consider making bundler parameter more type-safe

Final Recommendation

Approve with minor changes

This is a valuable feature that enhances the troubleshooting workflow. The code is well-written and well-tested. Once the critical trailing newline issue is fixed and the index.d.ts changes are clarified, this PR will be ready to merge.

The AI prompt generation is a creative solution to help users get assistance with configuration issues, and the implementation is solid.


Suggestions for Future Enhancement

  1. Interactive mode: Add a CLI flag to automatically copy the prompt to clipboard
  2. Issue templates: Generate GitHub issue templates pre-filled with the prompt
  3. Config diffing: Include automated diff between development and production configs
  4. Validation: Add a pre-flight check that validates the prompt can be parsed by common markdown renderers

Great work on this feature!

@claude
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claude bot commented Oct 11, 2025

PR Review: AI Analysis Prompt Generator

Overview

This PR adds an excellent new feature that generates AI analysis prompts for webpack/rspack configurations. The implementation is clean, well-tested, and provides real value for debugging and optimization workflows.


✅ Code Quality & Best Practices

Strengths:

  • Clean architecture: Well-organized with proper separation of concerns (AiPromptGenerator class is focused and single-purpose)
  • Comprehensive prompt content: The generated prompt covers all major analysis areas (migration issues, build errors, optimizations, best practices)
  • Good TypeScript practices: Proper type annotations and parameter handling in aiPromptGenerator.ts:18-23
  • Consistent code style: Follows existing patterns in the codebase
  • Clear documentation: The prompt file itself is self-documenting with clear sections

Minor Suggestions:

  1. Trailing newlines: The new files appear to follow the project requirement (as noted in CLAUDE.md). ✅
  2. Consider adding JSDoc comments to the public methods in AiPromptGenerator class for better IDE support

🐛 Potential Bugs & Issues

Issues Found:

  1. Index.d.ts breaking change (package/index.d.ts):

    • The TypeScript definitions have been completely restructured
    • Old interface-based approach replaced with a direct default export
    • This could be a breaking change for TypeScript users who import types from this module
    • The PR description says "No breaking changes" but this might affect consumers
    • Recommendation: Verify this doesn't break existing TypeScript usage, or document it as a breaking change
  2. No validation of exportedFiles array:

    • The generatePrompt method doesn't validate if the array is empty
    • If called with an empty array, the prompt would still be generated but might be confusing
    • Recommendation: Add a check or at least document expected input
  3. Date handling in tests:

    • The test in aiPromptGenerator.test.js:179 checks for date format with regex
    • This test is brittle and timezone-dependent
    • Recommendation: Consider mocking Date in tests or using a more flexible assertion

Minor Issues:

  1. File not found in CLI integration (cli.ts:250-265):
    • The AI prompt is generated and added to createdFiles array
    • Then in the summary loop (line 273), files ending in .md are skipped
    • This works but relies on implicit behavior (the prompt filename ending in .md)
    • Recommendation: Make this explicit by checking basename(file) === aiPromptFilename instead

⚡ Performance Considerations

Good:

  • ✅ Prompt generation is done once after all configs are exported (efficient)
  • ✅ String concatenation uses array join pattern which is performant
  • ✅ No unnecessary file I/O or external dependencies

No concerns - Performance impact is minimal, only adds a small file write operation.


🔒 Security Concerns

Analysis:

  • ✅ No code execution or eval usage
  • ✅ No external network requests
  • ✅ Only writes static markdown content
  • ✅ File paths are properly resolved and validated by FileWriter
  • ✅ No user input is directly interpolated without validation

Verdict: No security concerns identified. The PR description's claim of "no security implications" is accurate.


🧪 Test Coverage

Strengths:

  • 11 comprehensive tests covering all major functionality
  • ✅ Tests verify prompt content, file listing, bundler-specific content
  • ✅ Tests check both webpack and rspack variants
  • ✅ Tests validate optional React on Rails context inclusion
  • ✅ Edge cases covered (partial file lists, empty scenarios)

Suggestions for improvement:

  1. Missing integration test:

    • Tests only cover AiPromptGenerator in isolation
    • No test verifies the full --doctor flow including AI prompt generation
    • Recommendation: Add an integration test in the CLI test suite that verifies the AI prompt file is created
  2. Test file location:

    • Test file is at test/package/configExporter/aiPromptGenerator.test.js
    • This appears to be a NEW test file (not found in existing tests)
    • ✅ Follows existing test structure conventions
  3. Test trailing newline:

    • Verify test file ends with newline (project requirement per CLAUDE.md)

📋 Additional Recommendations

  1. Documentation update (docs/troubleshooting.md):

    • ✅ Excellent addition explaining the AI prompt feature
    • Well-integrated into existing documentation
    • Clear usage instructions
  2. Export in index.ts:

    • AiPromptGenerator is exported from configExporter/index.ts
    • This is good for extensibility if users want to generate prompts programmatically
  3. CLI output formatting (cli.ts:280-287):

    • The special AI Analysis section in the summary is a nice UX touch
    • Clear instructions on how to use the prompt
  4. Consider future enhancements:

    • Could add a --no-ai-prompt flag to opt out of AI prompt generation
    • Could add custom sections or context via config file
    • Could support other AI prompt formats (not just markdown)

🎯 Summary

Overall Assessment: ✅ Approved with minor suggestions

This is a high-quality PR that adds valuable functionality for users debugging webpack/rspack configurations. The implementation is clean, well-tested, and follows project conventions.

Key Points:

  • ✅ Code quality is excellent
  • ⚠️ Index.d.ts changes might be breaking - needs verification
  • ✅ Security and performance are not concerns
  • ✅ Test coverage is comprehensive
  • ✅ Documentation is clear and helpful

Recommended Actions Before Merge:

  1. Verify the index.d.ts changes don't break existing TypeScript usage (or document as breaking change)
  2. Consider adding JSDoc comments to public APIs
  3. Add integration test for full --doctor flow with AI prompt
  4. Ensure all new files end with trailing newlines (per CLAUDE.md)

Great work on this feature! 🎉 The AI prompt will be genuinely useful for users troubleshooting configuration issues.


Review generated with Claude Code

Include direct links to React on Rails example configuration files
in the AI analysis prompt. This provides AI assistants with reference
implementations to compare against when analyzing user configurations.

Added links to:
- commonWebpackConfig.js
- clientWebpackConfig.js
- serverWebpackConfig.js
- webpack.config.js

These examples demonstrate React on Rails best practices for webpack/rspack
configuration including proper client/server bundle separation and SSR setup.

Changes:
- Add 'Reference Configuration Examples' subsection to AI prompt
- Include GitHub links to React on Rails dummy app configs
- Update test to verify reference links are included
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Actionable comments posted: 1

🧹 Nitpick comments (2)
package/configExporter/aiPromptGenerator.ts (1)

54-54: Reuse a single timestamp for consistency.

We call new Date().toISOString() twice, which can produce slightly different values in the same prompt. Capture it once and reuse so headers stay aligned.

-    sections.push(`- **Exported At**: ${new Date().toISOString()}`)
+    const timestamp = new Date().toISOString()
+    sections.push(`- **Exported At**: ${timestamp}`)
...
-    sections.push(`**Date**: ${new Date().toISOString()}`)
+    sections.push(`**Date**: ${timestamp}`)

Also applies to: 264-264

test/package/configExporter/aiPromptGenerator.test.js (1)

10-186: Consider adding error handling tests and reducing test brittleness.

The test coverage is solid for happy paths, but could be enhanced:

  1. Error handling: Add tests for edge cases like empty exportedFiles arrays, null/undefined parameters, or invalid bundler names.
  2. String brittleness: Tests rely heavily on exact string matching. If the prompt wording changes slightly, many tests could fail. Consider testing for structure/presence of key elements rather than exact strings where appropriate.
  3. Test duplication: Several tests have similar setup code. Consider using test.each for bundler-specific tests or extracting common setup into helper functions.

Example refactor using test.each:

test.each([
  ['webpack'],
  ['rspack']
])('generatePrompt includes all sections for %s', (bundler) => {
  const exportedFiles = [
    `${bundler}-development-client.yaml`,
    `${bundler}-development-server.yaml`,
    `${bundler}-production-client.yaml`,
    `${bundler}-production-server.yaml`
  ]
  const prompt = generator.generatePrompt(exportedFiles, '/path/to/exports', bundler)
  expect(prompt).toContain(`**Bundler**: ${bundler}`)
  expect(prompt).toContain('# AI Configuration Analysis Request')
  // ... other assertions
})
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Reviewing files that changed from the base of the PR and between 1d5ea8c and 1d0b525.

📒 Files selected for processing (6)
  • docs/troubleshooting.md (1 hunks)
  • package/configExporter/aiPromptGenerator.ts (1 hunks)
  • package/configExporter/cli.ts (3 hunks)
  • package/configExporter/index.ts (1 hunks)
  • package/index.d.ts (1 hunks)
  • test/package/configExporter/aiPromptGenerator.test.js (1 hunks)
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**/*

📄 CodeRabbit inference engine (CLAUDE.md)

End every file with a trailing newline character

Files:

  • package/index.d.ts
  • test/package/configExporter/aiPromptGenerator.test.js
  • package/configExporter/index.ts
  • package/configExporter/cli.ts
  • docs/troubleshooting.md
  • package/configExporter/aiPromptGenerator.ts
🧬 Code graph analysis (4)
package/index.d.ts (1)
package/types/index.ts (1)
  • Configuration (58-58)
test/package/configExporter/aiPromptGenerator.test.js (2)
package/configExporter/aiPromptGenerator.ts (1)
  • AiPromptGenerator (8-276)
package/configExporter/index.ts (1)
  • AiPromptGenerator (5-5)
package/configExporter/cli.ts (2)
package/configExporter/aiPromptGenerator.ts (1)
  • AiPromptGenerator (8-276)
package/configExporter/index.ts (1)
  • AiPromptGenerator (5-5)
package/configExporter/aiPromptGenerator.ts (2)
package/configExporter/index.ts (1)
  • AiPromptGenerator (5-5)
lib/shakapacker/configuration.rb (1)
  • bundler (108-110)
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🔇 Additional comments (1)
test/package/configExporter/aiPromptGenerator.test.js (1)

1-8: LGTM!

The import and test setup are correct. The use of beforeEach ensures proper test isolation by creating a fresh generator instance for each test.

expect(prompt).toContain("**Bundler**: webpack")
expect(prompt).toMatch(/\*\*Date\*\*: \d{4}-\d{2}-\d{2}T/)
})
})
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⚠️ Potential issue | 🟡 Minor

Add trailing newline to comply with coding guidelines.

The file must end with a trailing newline character.

Apply this diff:

     expect(prompt).toMatch(/\*\*Date\*\*: \d{4}-\d{2}-\d{2}T/)
   })
 })
+

Based on coding guidelines.

📝 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
})
expect(prompt).toMatch(/\*\*Date\*\*: \d{4}-\d{2}-\d{2}T/)
})
})
🤖 Prompt for AI Agents
In test/package/configExporter/aiPromptGenerator.test.js around line 186, the
file is missing a trailing newline; add a single newline character at the end of
the file (ensure the final line ends with '\n'), save and commit so the file
ends with a trailing newline to comply with coding guidelines.

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claude bot commented Oct 11, 2025

Pull Request Review: AI Analysis Prompt Generator

I've completed a comprehensive review of PR #695. Overall, this is a well-implemented feature that adds significant value to the troubleshooting workflow. Here are my findings:


✅ Strengths

Code Quality

  • Clean Architecture: The AiPromptGenerator class is well-structured with clear separation of concerns
  • Strong TypeScript Usage: Proper typing with ConfigMetadata interface
  • Consistent Naming: Methods and variables follow clear naming conventions
  • Good Documentation: JSDoc comments on public methods explain purpose and parameters
  • Comprehensive Test Suite: 11 well-organized tests covering various scenarios

Implementation

  • Non-Breaking: Purely additive feature, no changes to existing functionality
  • Good Integration: Seamlessly integrates into existing --doctor mode workflow
  • User-Friendly Output: Clear CLI feedback with emoji indicators and helpful instructions
  • Flexible Design: includeReactOnRailsContext parameter allows customization

⚠️ Issues Found

1. Critical: Missing Trailing Newlines

Per CLAUDE.md: "ALWAYS end all files with a trailing newline character."

Files affected:

  • package/configExporter/aiPromptGenerator.ts (line 276)
  • test/package/configExporter/aiPromptGenerator.test.js (line 186)

Fix: Add newline at end of both files.

2. Type Definition Issue in index.d.ts

The type definition file was completely rewritten with a different structure:

Before:

interface ShakapackerExports {
  config: Config
  devServer: DevServerConfig
  // ... other exports
}
export = shakapacker

After:

declare const _default: {
  customizeArray: typeof webpackMerge.customizeArray
  // ... inline object type
}
export = _default

Concerns:

  • This appears to be an unintentional change (possibly auto-generated by TypeScript compiler)
  • The new structure is less maintainable (inline object type vs named interface)
  • Lost helpful documentation comments
  • May break type inference for consumers

Recommendation: Revert index.d.ts changes or update intentionally with proper documentation.

3. Hardcoded Date in Tests

expect(prompt).toMatch(/\*\*Date\*\*: \d{4}-\d{2}-\d{2}T/)

Issue: Test assumes ISO date format but doesn't fully validate timestamp format.

Suggestion: Make the regex more specific or mock Date in tests:

expect(prompt).toMatch(/\*\*Date\*\*: \d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z/)

💡 Recommendations

Code Improvements

1. Extract Magic Strings

// Consider extracting these as constants
const FILE_PATTERNS = {
  DEV_CLIENT: 'development-client',
  DEV_SERVER: 'development-server',
  PROD_CLIENT: 'production-client',
  PROD_SERVER: 'production-server'
} as const

2. DRY Principle in File Detection

The file detection pattern is repeated 4 times:

const clientDevFile = exportedFiles.find((f) => f.includes("development-client"))
const serverDevFile = exportedFiles.find((f) => f.includes("development-server"))
// ...

Suggestion:

private findConfigFile(files: string[], pattern: string): string | undefined {
  return files.find(f => f.includes(pattern))
}

3. Template Literals for Large Strings

The prompt generation uses array joining, which works but could be simplified:

// Consider using a template string or separate template file
// for better readability and maintainability

4. CLI Output Consistency

// Line 270-271: "Configuration Files:" (plural)
// But then iterates with a skip condition

Current code:

console.log("Configuration Files:")
createdFiles.forEach((file) => {
  const name = basename(file)
  if (name.endsWith(".md")) {
    return // Skip AI prompt in main list
  }
  console.log(`  ✓ ${name}`)
})

Better approach:

const configFiles = createdFiles.filter(f => !basename(f).endsWith('.md'))
const aiFiles = createdFiles.filter(f => basename(f).endsWith('.md'))

console.log("Configuration Files:")
configFiles.forEach((file) => {
  console.log(`  ✓ ${basename(file)}`)
})

console.log("")
console.log("AI Analysis:")
aiFiles.forEach((file) => {
  console.log(`  🤖 ${basename(file)} - Use this prompt to get AI recommendations`)
})

🔒 Security Assessment

✅ No security concerns identified:

  • No external dependencies added
  • No code execution or eval()
  • No user input processed unsafely
  • File writes are controlled and to known locations
  • No credentials or sensitive data handling

⚡ Performance Considerations

✅ Minimal performance impact:

  • Prompt generation is O(n) with small n (typically 4-5 files)
  • String concatenation via array join is efficient
  • Single additional file write during export
  • No blocking operations or network calls

Minor optimization opportunity:

  • Could memoize basename() calls that are repeated

🧪 Test Coverage

Strong test coverage (11 tests):

  • ✅ Filename generation
  • ✅ All major sections present
  • ✅ Bundler-specific content (webpack & rspack)
  • ✅ File listing accuracy
  • ✅ Partial file lists
  • ✅ React on Rails context toggling
  • ✅ Analysis objectives
  • ✅ Build error instructions
  • ✅ Output format requirements
  • ✅ Footer metadata

Potential additions:

  • Edge case: Empty exportedFiles array
  • Edge case: Invalid/malformed filenames
  • Integration test: Full doctor mode run with prompt generation
  • Snapshot test: Full prompt output for regression detection

📋 Pre-Merge Checklist

Before merging, please verify:

  • Run yarn lint - Ensure all TypeScript/JavaScript passes linting
  • Run bundle exec rubocop - Verify Ruby code style (if any Ruby changes)
  • Add trailing newlines to aiPromptGenerator.ts and test file
  • Review index.d.ts changes - Confirm if intentional or revert
  • Run full test suite - yarn test (or equivalent)
  • Manual test - Run bin/export-bundler-config --doctor and verify output

🎯 Overall Assessment

Grade: A- (Excellent with minor fixes needed)

This PR adds a genuinely useful feature that enhances the developer experience. The implementation is clean, well-tested, and follows good software engineering practices. The main issues are:

  1. ❗ Missing trailing newlines (required by project standards)
  2. ❗ Unintentional type definition changes (needs review)
  3. 💡 Minor refactoring opportunities for maintainability

Recommendation: Approve with minor changes requested


Great work on this feature! The AI-assisted troubleshooting workflow is a creative solution that will help users debug configuration issues more effectively. 👏

@claude
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claude bot commented Oct 11, 2025

Code Review: AI Analysis Prompt Generator

I have completed a thorough review of PR #695. Overall, this is a well-designed and valuable addition to the config exporter that will help users get intelligent configuration analysis.

Strengths

Code Quality

  • Clean architecture: The AiPromptGenerator class is well-structured with clear separation of concerns
  • Comprehensive testing: 11 test cases provide excellent coverage of all major functionality
  • Good documentation: Clear JSDoc comments and descriptive variable names
  • Type safety: Proper TypeScript typing throughout

User Experience

  • Helpful feature: Automatically generating an AI analysis prompt is innovative and practical
  • Clear output: The CLI summary now has a dedicated AI Analysis section with usage instructions
  • Comprehensive prompt: The generated prompt covers all the right areas (migration issues, build errors, optimization opportunities)

Best Practices

  • Non-breaking: Purely additive functionality, no breaking changes
  • Well-integrated: Seamlessly integrated into the existing --doctor workflow
  • React on Rails context: Smart inclusion of framework-specific guidance

Areas for Improvement

1. Minor: File ending newline (aiPromptGenerator.ts:299)

According to the project CLAUDE.md guidelines, all files must end with a trailing newline. The file currently ends at line 299 without a trailing newline.

2. Minor: Type definition changes (index.d.ts)

The type definitions were significantly refactored in this PR. The PR description mentions TypeScript declarations consolidated but could use more context about why this change was made.

3. Enhancement: Consider input validation

The bundler parameter is directly interpolated into the prompt. While currently safe, consider documenting expected values or adding validation.

4. Test coverage: Missing edge case

Could add test for empty exportedFiles array.

Recommendations by Priority

High Priority

  1. Add trailing newline to aiPromptGenerator.ts (per project guidelines)
  2. Document index.d.ts changes in PR description

Medium Priority

  1. Consider adding validation for the bundler parameter
  2. Add test case for empty exportedFiles array

Security Assessment

No security concerns identified:

  • No external dependencies added
  • No code execution or eval
  • No sensitive data handling
  • Only generates documentation files

Performance Considerations

Minimal performance impact:

  • Runs only in --doctor mode (opt-in)
  • String concatenation is efficient for this use case
  • No blocking operations

Test Coverage

Excellent test coverage with 11 tests covering all major functionality

Overall Assessment

Recommendation: APPROVE with minor fixes

This PR adds significant value to the shakapacker ecosystem by making configuration troubleshooting more accessible through AI assistance. The implementation is clean, well-tested, and follows good software engineering practices.

Action Items Before Merge:

  1. Add trailing newline to aiPromptGenerator.ts
  2. Clarify index.d.ts changes in PR description
  3. Run yarn lint to verify no linting issues
  4. Run bundle exec rspec to verify no test failures

Great work on this feature!

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Actionable comments posted: 1

🧹 Nitpick comments (2)
package/configExporter/aiPromptGenerator.ts (2)

54-54: Extract timestamp to avoid inconsistency.

The timestamp is generated twice using new Date().toISOString() (lines 54 and 287). While unlikely, these calls could produce different values if execution crosses a millisecond boundary. Extract the timestamp to a constant at the beginning of the method to ensure consistency.

Apply this diff:

   ): string {
+    const timestamp = new Date().toISOString()
+
     const clientDevFile = exportedFiles.find((f) =>
       f.includes("development-client")
     )

Then update both usages:

     sections.push(`- **Bundler**: ${bundler}`)
-    sections.push(`- **Exported At**: ${new Date().toISOString()}`)
+    sections.push(`- **Exported At**: ${timestamp}`)
     sections.push(`- **Export Directory**: ${targetDir}`)
     sections.push("**Generated by Shakapacker Config Exporter**")
     sections.push(`**Bundler**: ${bundler}`)
-    sections.push(`**Date**: ${new Date().toISOString()}`)
+    sections.push(`**Date**: ${timestamp}`)
     sections.push("")

Also applies to: 287-287


128-138: Hardcoded GitHub URLs are valid; consider pinning to a release tag
All links return HTTP 200 and the default branch is master, but they may break if the branch or paths change. For long-term stability, link to a specific version tag (e.g., a release) instead of master.

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📒 Files selected for processing (2)
  • package/configExporter/aiPromptGenerator.ts (1 hunks)
  • test/package/configExporter/aiPromptGenerator.test.js (1 hunks)
🚧 Files skipped from review as they are similar to previous changes (1)
  • test/package/configExporter/aiPromptGenerator.test.js
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**/*

📄 CodeRabbit inference engine (CLAUDE.md)

End every file with a trailing newline character

Files:

  • package/configExporter/aiPromptGenerator.ts
🧬 Code graph analysis (1)
package/configExporter/aiPromptGenerator.ts (2)
package/configExporter/index.ts (1)
  • AiPromptGenerator (5-5)
lib/shakapacker/configuration.rb (1)
  • bundler (108-110)
⏰ 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). (3)
  • GitHub Check: Generator specs (ubuntu-latest, 3.2, gemfiles/Gemfile-rails.7.0.x)
  • GitHub Check: Test Bundler Switching
  • GitHub Check: claude-review
🔇 Additional comments (2)
package/configExporter/aiPromptGenerator.ts (2)

299-299: Ensure file ends with a trailing newline.

Per the coding guidelines, all files must end with a trailing newline character. Please verify that this file ends with a newline after the closing brace.

As per coding guidelines.


8-291: Well-structured implementation!

The AiPromptGenerator class is well-designed with:

  • Clear separation between metadata gathering and content generation
  • Comprehensive coverage of analysis objectives (migration issues, build errors, optimizations)
  • Conditional sections that adapt to context (React on Rails)
  • Logical progression from high-level context to specific analysis requests
  • Appropriate use of markdown formatting for readability

The prompt structure effectively guides AI assistants through the configuration analysis workflow.

Comment on lines +1 to +2
import { basename } from "path"
import { ConfigMetadata } from "./types"
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🛠️ Refactor suggestion | 🟠 Major

Remove unused imports.

Neither basename nor ConfigMetadata are used in this file. Removing these unused imports will clean up the code and reduce confusion.

Apply this diff to remove the unused imports:

-import { basename } from "path"
-import { ConfigMetadata } from "./types"
-
 /**
  * Generates an AI prompt file for analyzing webpack/rspack configuration exports.
  * The prompt helps AI identify issues and suggest optimizations for the bundler configuration.
  */
 export class AiPromptGenerator {
📝 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
import { basename } from "path"
import { ConfigMetadata } from "./types"
/**
* Generates an AI prompt file for analyzing webpack/rspack configuration exports.
* The prompt helps AI identify issues and suggest optimizations for the bundler configuration.
*/
export class AiPromptGenerator {
🤖 Prompt for AI Agents
In package/configExporter/aiPromptGenerator.ts around lines 1 to 2, the imports
"basename" from path and "ConfigMetadata" from ./types are unused; remove those
two named imports from the file's import statements (delete the basename import
and the ConfigMetadata import) and run a quick grep/TS compile to ensure no
remaining references, leaving only actually used imports in this module.

Update AI prompt to mention upcoming exported reference configurations
in YAML format. These will be generated via a rake task (tracked in
react_on_rails#1862) that runs the generators and exports configs.

This provides better context to users about:
- Current reference: JavaScript source config files
- Future reference: Exported YAML configs for direct comparison

The YAML exports will make it easier for AI to compare configurations
since they'll be in the same format as the user's exported configs.

Changes:
- Add 'Coming Soon' section for YAML reference configs
- Link to react_on_rails#1862 tracking the rake task
- Update test to verify issue link is included
- Clarify distinction between source (JS) and exported (YAML) configs
Update AI prompt to specify that reference configurations will include
8 YAML files total: 4 for webpack and 4 for rspack, covering all
development/production × client/server combinations.

This aligns with the updated react_on_rails#1862 which now specifies
generating configs for both bundlers to support migration scenarios.

Changes:
- Mention 8 total config files in the coming soon section
- Clarify breakdown: 4 webpack + 4 rspack configurations
- Makes it clear users will have reference configs for both bundlers
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Actionable comments posted: 0

♻️ Duplicate comments (1)
package/configExporter/aiPromptGenerator.ts (1)

1-2: Remove unused imports.

Neither basename nor ConfigMetadata are used in this file.

Apply this diff to remove the unused imports:

-import { basename } from "path"
-import { ConfigMetadata } from "./types"
-
 /**
  * Generates an AI prompt file for analyzing webpack/rspack configuration exports.
  * The prompt helps AI identify issues and suggest optimizations for the bundler configuration.
  */
 export class AiPromptGenerator {
🧹 Nitpick comments (1)
package/configExporter/aiPromptGenerator.ts (1)

18-314: Compute timestamp once for consistency.

The method calls new Date().toISOString() twice (lines 54 and 310). Computing it once ensures consistent timestamps throughout the generated prompt and avoids redundant computation.

Apply this diff:

   generatePrompt(
     exportedFiles: string[],
     targetDir: string,
     bundler: string,
     includeReactOnRailsContext = true
   ): string {
+    const timestamp = new Date().toISOString()
+
     const clientDevFile = exportedFiles.find((f) =>
       f.includes("development-client")
     )
     const serverDevFile = exportedFiles.find((f) =>
       f.includes("development-server")
     )
     const clientProdFile = exportedFiles.find((f) =>
       f.includes("production-client")
     )
     const serverProdFile = exportedFiles.find((f) =>
       f.includes("production-server")
     )

     const sections: string[] = []

     // Header
     sections.push("# AI Configuration Analysis Request")
     sections.push("")
     sections.push(
       `This directory contains exported ${bundler} configuration files for analysis.`
     )
     sections.push(
       "Please analyze these configurations and provide recommendations."
     )
     sections.push("")

     // Context section
     sections.push("## Context")
     sections.push("")
     sections.push(`- **Bundler**: ${bundler}`)
-    sections.push(`- **Exported At**: ${new Date().toISOString()}`)
+    sections.push(`- **Exported At**: ${timestamp}`)
     sections.push(`- **Export Directory**: ${targetDir}`)

And at the footer:

     // Footer
     sections.push("---")
     sections.push("")
     sections.push("**Generated by Shakapacker Config Exporter**")
     sections.push(`**Bundler**: ${bundler}`)
-    sections.push(`**Date**: ${new Date().toISOString()}`)
+    sections.push(`**Date**: ${timestamp}`)
     sections.push("")

     return sections.join("\n")
   }
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📄 CodeRabbit inference engine (CLAUDE.md)

End every file with a trailing newline character

Files:

  • package/configExporter/aiPromptGenerator.ts
🧬 Code graph analysis (1)
package/configExporter/aiPromptGenerator.ts (2)
package/configExporter/index.ts (1)
  • AiPromptGenerator (5-5)
lib/shakapacker/configuration.rb (1)
  • bundler (108-110)
⏰ 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). (2)
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Update AI prompt to specify that reference configurations will include
10 YAML files total: 5 for webpack and 5 for rspack.

The additional files are development client configs with HMR enabled,
which capture the dev server configuration including:
- Hot Module Replacement settings
- Dev server configuration (port, host, HTTPS)
- Live reload configuration
- Proxy settings

This aligns with updated react_on_rails#1862 which now includes
HMR configs to help users troubleshoot dev server and hot reload issues.

Changes:
- Update from 8 to 10 total config files
- List all 5 config types (dev client, dev client HMR, dev server, prod client, prod server)
- Explain importance of HMR configs for dev server troubleshooting
- Clarify that each bundler (webpack/rspack) gets all 5 variants
@claude
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claude bot commented Oct 13, 2025

Code Review: AI Analysis Prompt Generator

Overall Assessment

This is a well-designed feature that adds significant value to the troubleshooting workflow. The code is clean, well-tested, and follows TypeScript best practices. I have identified a few minor issues and suggestions for improvement.

✅ Strengths

  1. Excellent Feature Design: The AI prompt generator is a creative solution that will genuinely help users troubleshoot configuration issues
  2. Comprehensive Test Coverage: 11 test cases covering various scenarios including edge cases
  3. Good Documentation: Clear inline comments and well-structured prompt output
  4. Type Safety: Proper TypeScript types throughout
  5. Non-Breaking: Purely additive functionality with no breaking changes
  6. User Experience: Clear console output with helpful guidance

🐛 Potential Issues

1. Missing Newline at End of aiPromptGenerator.ts (Critical)

File: package/configExporter/aiPromptGenerator.ts:330

According to CLAUDE.md: "ALWAYS end all files with a trailing newline character. This is required by the project's linting rules."

The new aiPromptGenerator.ts file ends at line 330 without a trailing newline. This will fail linting checks.

Fix: Add a newline after the closing brace on line 330.

2. Missing Newline in Test File (Critical)

File: test/package/configExporter/aiPromptGenerator.test.js:197

Same issue - the test file also needs a trailing newline after the final closing parenthesis.

3. Type Definition Changes Look Suspicious

File: package/index.d.ts

The changes to index.d.ts appear to be a major refactoring that:

  • Changes from a well-documented interface (ShakapackerExports) to an anonymous default export
  • Removes helpful JSDoc comments
  • Changes the export style from export = to declare const _default
  • Adds webpack-merge functions directly to the export object

Questions:

  • Is this refactoring intentional or did it happen accidentally?
  • These changes seem unrelated to the AI prompt generator feature
  • This could be a breaking change for TypeScript users

Recommendation: Either revert these changes or explain them in the PR description and ensure they are tested.

📝 Code Quality Suggestions

1. Hardcoded Date Formatting

File: package/configExporter/aiPromptGenerator.ts:54,319

The code uses new Date().toISOString() multiple times. Consider making the date testable by accepting it as a parameter with a default. This would make tests more deterministic.

2. Magic String for Markdown Extension

File: package/configExporter/cli.ts:276

Consider checking against the actual prompt filename instead of using .endsWith(".md")

3. Consider Adding Error Handling

File: package/configExporter/cli.ts:253-264

The AI prompt generation does not have try-catch error handling. If it fails, the entire doctor mode would fail. Consider wrapping in try-catch and continuing with other outputs.

🧪 Test Coverage

Overall: Excellent test coverage with 11 test cases

Suggestions:

  1. Add a test for empty exportedFiles array
  2. Test with non-standard filenames that do not match expected patterns
  3. Test that the generated prompt is valid Markdown

🔒 Security & ⚡ Performance

Security: No concerns - generates static markdown files only
Performance: No concerns - simple string concatenation in non-hot path

🎯 Summary

This is a solid PR with a useful feature. The main blockers are:

  1. ⚠️ Fix trailing newlines in both new files (linting requirement)
  2. ⚠️ Clarify index.d.ts changes - are they intentional?

Once these are addressed, this will be ready to merge!

Great work on creating a feature that will genuinely help users debug their configurations! 🚀

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