Add CI failure analysis and PR splitting strategy documentation #2101
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This PR contains only documentation changes extracted from PR #2069. Zero risk - no code changes, just valuable documentation for the team. New Documentation Added: 1. CI Failure Analysis (.claude/docs/analysis/CI_FAILURES_2024-11-21.md) - Comprehensive analysis of PR #2069 test failures - Root cause analysis with evidence from CI logs - Identified suspicious commits - Fix recommendations (all marked UNTESTED HYPOTHESIS) - Prevention strategies - CRITICAL DISCLAIMER: Analysis from isolated workspace 2. Testing Requirements (CLAUDE.md) - New section: "CRITICAL - LOCAL TESTING REQUIREMENTS" - Must distinguish "This fixes" vs "This SHOULD fix" - Must explain why local testing isn't possible - Must provide test commands - Must document what was tested - Enhanced "Replicating CI Failures Locally" section 3. PR Splitting Strategy (.claude/docs/pr-splitting-strategy.md) - When to split large PRs (indicators, decision criteria) - Strategy for identifying independent commits - Step-by-step splitting process - Real example: How to split PR #2069 - Benefits, anti-patterns, decision tree - Templates for PR split announcements 4. Analysis Index (.claude/docs/analysis/INDEX.md) - Added new documents to navigation - Updated quick reference links Why This Matters: - Documents actual CI failures for future reference - Establishes clear requirements for testing vs hypothetical fixes - Provides framework for handling complex PRs with multiple failures - All future AI work will distinguish tested vs untested fixes - Team has strategy for breaking up large problematic PRs Testing: None required (documentation only) Related: PR #2069 (monorepo-completion) which will not merge 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
WalkthroughAdds new analysis and guidance documentation: a CI failure analysis, an analysis index, a PR-splitting strategy, and extensive CLAUDE.md updates covering project structure, testing guidance (including Playwright), Webpack debugging, and monorepo path clarifications. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes
Possibly related issues
Possibly related PRs
Suggested reviewers
Poem
Pre-merge checks and finishing touches✅ Passed checks (3 passed)
✨ Finishing touches🧪 Generate unit tests (beta)
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🧰 Additional context used📓 Path-based instructions (2)**/*📄 CodeRabbit inference engine (CLAUDE.md)
Files:
**/*.{js,ts,jsx,tsx,json,md,yml,yaml}📄 CodeRabbit inference engine (CLAUDE.md)
Files:
🧠 Learnings (41)📓 Common learnings📚 Learning: 2025-11-24T16:54:16.957ZApplied to files:
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🪛 LanguageTool.claude/docs/pr-splitting-strategy.md[style] ~16-~16: ‘mixed together’ might be wordy. Consider a shorter alternative. (EN_WORDINESS_PREMIUM_MIXED_TOGETHER) [style] ~39-~39: Consider using a different adjective in this context to strengthen your wording. (GOOD_ALTERNATIVE) [style] ~45-~45: Consider using a different verb for a more formal wording. (FIX_RESOLVE) [style] ~441-~441: Consider using a different verb for a more formal wording. (FIX_RESOLVE) CLAUDE.md[uncategorized] ~644-~644: The official name of this software platform is spelled with a capital “H”. (GITHUB) .claude/docs/analysis/CI_FAILURES_2024-11-21.md[grammar] ~183-~183: Use a hyphen to join words. (QB_NEW_EN_HYPHEN) [uncategorized] ~247-~247: If this is a compound adjective that modifies the following noun, use a hyphen. (EN_COMPOUND_ADJECTIVE_INTERNAL) [uncategorized] ~251-~251: “React” is a proper noun and needs to be capitalized. (A_GOOGLE) 🪛 markdownlint-cli2 (0.18.1)CLAUDE.md62-62: Emphasis used instead of a heading (MD036, no-emphasis-as-heading) 🔇 Additional comments (6)
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Code Review - PR #2101OverviewThis PR adds comprehensive documentation for CI failure analysis and PR splitting strategies. Zero code changes - documentation only. The changes are well-structured and provide immediate value to the team. ✅ Strengths1. Excellent Content Quality
2. Proper Documentation Organization
3. Alignment with Project Standards
📝 Minor Suggestions1. Date Format in CI_FAILURES_2024-11-21.mdLine 3: Date shows -**Date**: 2024-11-21
+**Date**: 2025-11-21This appears in multiple places in the file. 2. Analysis Index Timestamp.claude/docs/analysis/INDEX.md (line 273): -These documents were generated on: 2025-11-19
+These documents were generated on: 2025-11-22And line 275: -Last Updated: 2025-11-21
+Last Updated: 2025-11-22Should reflect actual creation date. 3. Consider Adding Link to PR Splitting Guide in CLAUDE.mdThe new "CRITICAL - LOCAL TESTING REQUIREMENTS" section in CLAUDE.md could reference the PR splitting strategy document: **See also**: `.claude/docs/pr-splitting-strategy.md` for guidance on handling complex PRs with multiple CI failures.This would help developers discover the strategy guide when they're dealing with CI failures. 🔍 Detailed AnalysisCode Quality: N/A
Best Practices: ✅ Excellent
Potential Bugs: None
Performance: N/A
Security: N/A
Test Coverage: N/A
🎯 Value AssessmentImmediate Value: High ✅
Long-term Value: High ✅
Risk: Zero ✅
✅ RecommendationAPPROVE with minor corrections This PR should be merged after addressing the date inconsistencies noted above. The documentation provides significant value to the team and aligns perfectly with the project's quality standards. The additions are:
Before Merging
📚 Additional NotesConsistency with CLAUDE.md Guidelines
Formatting
Documentation StructureThe new documentation hierarchy is excellent:
This makes information discoverable and usable. Great work on this PR! The documentation will significantly help the team navigate complex CI failures and make better decisions about PR management. 🎉 |
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Actionable comments posted: 6
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.claude/docs/analysis/CI_FAILURES_2024-11-21.md(1 hunks).claude/docs/analysis/INDEX.md(1 hunks).claude/docs/pr-splitting-strategy.md(1 hunks)CLAUDE.md(10 hunks)
🧰 Additional context used
🧠 Learnings (8)
📚 Learning: 2025-02-12T16:38:06.537Z
Learnt from: Romex91
Repo: shakacode/react_on_rails PR: 1697
File: package-scripts.yml:28-28
Timestamp: 2025-02-12T16:38:06.537Z
Learning: The file `node_package/lib/ReactOnRails.full.js` is autogenerated during the build process and should not be present in the repository.
Applied to files:
CLAUDE.md
📚 Learning: 2025-10-23T17:22:01.074Z
Learnt from: AbanoubGhadban
Repo: shakacode/react_on_rails PR: 1875
File: lib/react_on_rails/utils.rb:112-124
Timestamp: 2025-10-23T17:22:01.074Z
Learning: In React on Rails, when Pro is installed but not licensed, the intended behavior is to raise an error on boot. The `react_on_rails_pro?` method validates licenses and should raise errors early (including during path resolution in methods like `server_bundle?`) to enforce licensing requirements rather than failing later with obscure errors.
Applied to files:
CLAUDE.md
📚 Learning: 2025-02-18T13:08:01.477Z
Learnt from: AbanoubGhadban
Repo: shakacode/react_on_rails PR: 1644
File: lib/react_on_rails/helper.rb:190-197
Timestamp: 2025-02-18T13:08:01.477Z
Learning: RSC support validation in React on Rails Pro is handled through a chain of validations:
1. Pro version check in `run_stream_inside_fiber`
2. RSC support check during pack generation via `ReactOnRailsPro.configuration.enable_rsc_support`
3. RSC support validation during component registration
This makes additional validation in the helper methods unnecessary.
Applied to files:
CLAUDE.md
📚 Learning: 2025-04-26T21:55:55.874Z
Learnt from: alexeyr-ci2
Repo: shakacode/react_on_rails PR: 1732
File: spec/dummy/client/app-react16/startup/ReduxSharedStoreApp.client.jsx:40-44
Timestamp: 2025-04-26T21:55:55.874Z
Learning: In the react_on_rails project, files under `app-react16` directories are copied/moved to corresponding `/app` directories during the conversion process (removing the `-react16` suffix), which affects their relative import paths at runtime.
Applied to files:
CLAUDE.md
📚 Learning: 2025-09-16T08:01:11.146Z
Learnt from: justin808
Repo: shakacode/react_on_rails PR: 1770
File: lib/generators/react_on_rails/templates/base/base/app/javascript/src/HelloWorld/ror_components/HelloWorld.client.jsx:2-2
Timestamp: 2025-09-16T08:01:11.146Z
Learning: React on Rails uses webpack CSS Modules configuration with namedExports: true, which requires the import syntax `import * as style from './file.module.css'` rather than the default export pattern. This configuration enables better tree shaking and bundle size optimization for CSS modules.
Applied to files:
CLAUDE.md
📚 Learning: 2025-02-13T16:50:47.848Z
Learnt from: AbanoubGhadban
Repo: shakacode/react_on_rails PR: 1644
File: node_package/src/clientStartup.ts:18-21
Timestamp: 2025-02-13T16:50:47.848Z
Learning: In the react_on_rails module, the `reactOnRailsPageUnloaded` function in clientStartup.ts is intentionally kept private as it's only used internally as a callback for `onPageUnloaded`.
Applied to files:
CLAUDE.md
📚 Learning: 2025-07-08T05:57:29.630Z
Learnt from: AbanoubGhadban
Repo: shakacode/react_on_rails PR: 1745
File: node_package/src/RSCRequestTracker.ts:8-14
Timestamp: 2025-07-08T05:57:29.630Z
Learning: The global `generateRSCPayload` function in React on Rails Pro (RORP) is provided by the framework during rendering requests, not implemented in application code. The `declare global` statements are used to document the expected interface that RORP will inject at runtime.
Applied to files:
CLAUDE.md
📚 Learning: 2024-07-27T10:08:35.868Z
Learnt from: theforestvn88
Repo: shakacode/react_on_rails PR: 1620
File: spec/dummy/client/app/startup/HelloTurboStream.jsx:3-3
Timestamp: 2024-07-27T10:08:35.868Z
Learning: The `RailsContext` import in `spec/dummy/client/app/startup/HelloTurboStream.jsx` is used later in the project, as clarified by the user theforestvn88.
Applied to files:
CLAUDE.md
🪛 LanguageTool
.claude/docs/pr-splitting-strategy.md
[style] ~16-~16: ‘mixed together’ might be wordy. Consider a shorter alternative.
Context: ...he branch - Multiple feature changes mixed together - Hard to bisect or identify which c...
(EN_WORDINESS_PREMIUM_MIXED_TOGETHER)
[style] ~39-~39: Consider using a different adjective in this context to strengthen your wording.
Context: ...kspace dependency changes Why it's a good candidate for splitting: - ✅ Multipl...
(GOOD_ALTERNATIVE)
[style] ~45-~45: Consider using a different verb for a more formal wording.
Context: ...ndependently - ✅ Estimated 4-8 hours to fix all issues --- ## Strategy for Splitt...
(FIX_RESOLVE)
[style] ~441-~441: Consider using a different verb for a more formal wording.
Context: ...its to PR 2 - Day 2: Test PR 2 locally, fix issues, open for review - Day 3: Addres...
(FIX_RESOLVE)
.claude/docs/analysis/CI_FAILURES_2024-11-21.md
[grammar] ~183-~183: Use a hyphen to join words.
Context: ...es --- ## Suspicious Commits ### High Priority Suspects #### 1. 09f8c27cb -...
(QB_NEW_EN_HYPHEN)
[uncategorized] ~247-~247: If this is a compound adjective that modifies the following noun, use a hyphen.
Context: ...ted to monorepo restructuring --- ### Medium Priority Suspects - 6ae74c2b8 - Phase 5: Add ...
(EN_COMPOUND_ADJECTIVE_INTERNAL)
[uncategorized] ~251-~251: “React” is a proper noun and needs to be capitalized.
Context: ...2021be66- Remove invalid exports from react_on_rails_pro/package.json -e7befce`...
(A_GOOGLE)
CLAUDE.md
[grammar] ~626-~626: Use a hyphen to join words.
Context: ...nstead of UI setup - Test React on Rails specific features: SSR, hydration, compo...
(QB_NEW_EN_HYPHEN)
[uncategorized] ~640-~640: The official name of this software platform is spelled with a capital “H”.
Context: ...automatically in CI via GitHub Actions (.github/workflows/playwright.yml). The workflo...
(GITHUB)
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.claude/docs/analysis/INDEX.md
9-9: Emphasis used instead of a heading
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CLAUDE.md
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🔇 Additional comments (12)
.claude/docs/pr-splitting-strategy.md (1)
1-472: Excellent comprehensive guide on PR splitting strategy.The document is well-organized with clear sections on indicators, strategy, real-world examples, benefits, anti-patterns, and decision trees. The use of PR #2069 as a running example makes the guidance concrete and actionable. The disclaimers about testing requirements and the emphasis on incremental progress align well with the broader PR's testing guidance updates.
.claude/docs/analysis/CI_FAILURES_2024-11-21.md (2)
10-31: Excellent use of critical disclaimer for untested analysis.The "CRITICAL DISCLAIMER" section clearly sets expectations that all fixes are hypotheses requiring local verification. This aligns perfectly with the new testing requirements added to CLAUDE.md and establishes the right tone for developers reading this analysis.
48-523: Comprehensive CI failure analysis with clear root cause investigation.The document provides thorough analysis of three failing test suites and one hung test, with:
- Clear evidence from CI logs and source code
- Identification of suspicious commits (with priority levels)
- Practical debugging strategies
- Realistic estimated fix time (4-8 hours)
- Prevention strategies for the future
The approach of comparing against the base commit and providing bisect guidance is excellent. The distinction between what still works and what's broken provides useful context for developers.
CLAUDE.md (7)
5-19: New Project Structure Guidelines section provides clear documentation standards.The guidelines for placing analysis documents in
/analysisdirectory and using consistent naming conventions is helpful for keeping the.claude/directory organized. This provides good context for developers about where documentation should be placed.
32-57: CRITICAL LOCAL TESTING REQUIREMENTS section is excellent addition.This new section directly addresses the testing discipline needed for this monorepo:
- Clear distinction between tested ("This fixes...") vs. untested ("This SHOULD fix...") changes
- Acknowledges environment limitations (isolated workspace, missing services)
- Emphasizes local verification over CI iteration
- Aligns perfectly with the CI failure analysis and PR splitting guidance in other docs
This guidance will improve the quality of future PR analysis and debugging efforts.
408-495: New Debugging Webpack Configuration Issues section is comprehensive and practical.The section provides:
- Concrete debug scripts to inspect webpack configuration
- Step-by-step debugging approach with actual Node.js examples
- Common issues (CSS Modules, rule matching) with solutions
- Proper cleanup instructions
This is exactly the kind of troubleshooting guide developers need when dealing with webpack/Shakapacker issues. The examples are well-documented and runnable.
504-645: Comprehensive Playwright E2E Testing section with excellent practical examples.The new section covers:
- Setup instructions with browser installation
- Running tests with multiple modes (UI, headed, debug, report)
- Writing tests with Rails integration helpers (app, appEval, appFactories)
- Test organization and directory structure
- Best practices and debugging tips
- CI integration details
The examples of using
cypress-on-railshelpers for database control and factory creation are especially valuable. The emphasis on leveraging Rails helpers instead of UI setup is a best practice.
315-333: Enhanced Merge Conflict Resolution Workflow with path verification.The updated workflow adds important steps for verifying file paths after directory structure changes, including:
- Testing affected scripts (package-scripts.yml, webpack configs)
- Explicit verification of path references with grep
- Running critical test suites after build config changes
This directly addresses the kind of silent failures that caused the 7-week yalc publish issue referenced in the learnings. The emphasis on "don't blindly accept path changes" is critical.
88-88: Build command references updated correctly to new monorepo structure.References now correctly point to
packages/react-on-rails/libfor TypeScript compilation output, reflecting the monorepo structure. This aligns with the path updates throughout the file replacing "node_package" with "packages/react-on-rails".
727-730: Verify IDE exclusion of/packages/react-on-rails/libis appropriate.This directory contains autogenerated TypeScript compilation output and should indeed be excluded. However, consider whether other autogenerated locations should also be excluded (e.g.,
/packages/react-on-rails-pro/lib,/packages/react-on-rails-pro-node-renderer/lib). Based on the learnings, all three packages will have autogenerated lib directories..claude/docs/analysis/INDEX.md (2)
1-275: Excellent navigation index for analysis documents with clear workflow guidance.The index provides:
- Clear document summaries with status indicators (✅ COMPLETE, ❌ NEEDS UPDATES, etc.)
- "I Need To..." quick navigation linking use cases to specific sections
- Key facts at a glance with critical context (7-week yalc silent failure)
- Workflow tips for different stages (before starting, during development, before merging)
- Phase status tracking with clear identification of current blockers
The strategic placement of CI_FAILURES_2024-11-21.md at the top as "CURRENT BLOCKER" with 🔴 emoji effectively communicates urgency. The reference to PR #2069 failing helps developers quickly understand the context.
7-100: Use markdown headings instead of emphasis for document section headers.Lines 9, 28, 49, 67, 80, and 88 use bold text for section headers but should be markdown headings for proper document structure. This improves navigation and indexing.
-### 1. CI_FAILURES_2024-11-21.md (CURRENT BLOCKER - 24 KB) 🔴 +### 1. CI_FAILURES_2024-11-21.md (CURRENT BLOCKER - 24 KB) 🔴Apply the same fix for:
- Line 26 (MONOREPO_MIGRATION_ANALYSIS.md)
- Line 47 (MIGRATION_QUICK_REFERENCE.md)
- Line 66 (CLAUDE_MD_UPDATES.md)
- Line 79 (claude-md-improvements.md)
- Line 88 (pr-splitting-strategy.md)
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###so no change is needed. The linter may be flagging a different issue. Please verify.Likely an incorrect or invalid review comment.
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Add language specification to code block for syntax highlighting.
Line 602 Playwright test code needs a language identifier.
-```
+```javascript
spec/dummy/e2e/🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
602-602: Fenced code blocks should have a language specified
(MD040, fenced-code-language)
🤖 Prompt for AI Agents
In CLAUDE.md around line 602, the fenced code block lacks a language identifier
which prevents syntax highlighting; update the opening fence to include the
language (e.g., ```javascript) so the Playwright test path or snippet is marked
as JavaScript, ensuring proper syntax highlighting and rendering.
Minor corrections to documentation: 1. Fix date in CI_FAILURES analysis (2024 -> 2025) 2. Update INDEX.md timestamps to reflect actual creation date 3. Add cross-reference in CLAUDE.md testing requirements - Links to PR splitting strategy guide - Helps developers discover the guide when dealing with CI failures All corrections improve accuracy and discoverability of documentation. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Documentation-only changes extracted from PR #2069. Zero code changes - provides valuable documentation for handling CI failures and splitting large PRs. Includes: 1. CI failure analysis for PR #2069 2. Testing requirements (tested vs untested fixes) 3. PR splitting strategy guide 4. Analysis index with navigation All changes rebased on latest master. Related: PR #2069, supersedes PR #2101 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Address all CodeRabbit review comments: - Add language specifications to code blocks (text, bash) - Fix heading structure (use #### instead of bold emphasis) - Add hyphen to compound adjective "React on Rails-specific" - Remove duplicate "Related Documentation" section in INDEX.md Changes: - CI_FAILURES_2024-11-21.md: Add 'text' language to 3 code blocks - INDEX.md: Remove duplicate Related Documentation section - pr-splitting-strategy.md: Add 'text' language to code blocks, fix heading levels - CLAUDE.md: Add 'text' language to code block, fix hyphenation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Address all CodeRabbit review comments from PR #2101: - Add language specifications to code blocks (text, bash) - Fix heading structure (use #### instead of bold emphasis) - Add hyphen to compound adjective "React on Rails-specific" - Remove duplicate "Related Documentation" section in INDEX.md Changes: - CI_FAILURES_2024-11-21.md: Add 'text' language to 3 code blocks - INDEX.md: Remove duplicate Related Documentation section - pr-splitting-strategy.md: Add 'text' language to code blocks, fix heading levels - CLAUDE.md: Add 'text' language to code block, fix hyphenation 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Summary
This PR adds comprehensive documentation for analyzing CI failures and strategies for splitting large PRs. Documentation only - zero code changes.
Extracted from PR #2069 which will not be merged.
What's Added
1. CI Failure Analysis Document ✅
File:
.claude/docs/analysis/CI_FAILURES_2024-11-21.md2. Testing Requirements Documentation ✅
File:
CLAUDE.md(enhanced)New section: "CRITICAL - LOCAL TESTING REQUIREMENTS"
3. PR Splitting Strategy Guide ✅
File:
.claude/docs/pr-splitting-strategy.mdComprehensive guide covering:
4. Analysis Index ✅
File:
.claude/docs/analysis/INDEX.mdWhy This Matters
For CI Failure Analysis
Future agents/developers will:
For Code Reviews
Reviewers will:
For Complex PRs
Teams can:
Testing
✅ None required - documentation only
✅ Pre-commit hooks passed (prettier, trailing newlines)
✅ No code changes to test
Related
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