Enable Shakapacker early hints #687
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WalkthroughThis PR enables HTTP/2 Early Hints feature across the application stack. It switches the shakapacker dependency to a specific GitHub branch ( Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Changes follow a consistent pattern of enabling a single feature (early hints) through configuration and startup flags. While spread across multiple files, the modifications are homogeneous, straightforward, and don't introduce complex logic—primarily configuration updates and dependency source changes. Possibly related issues
Possibly related PRs
Suggested reviewers
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Pre-merge checks and finishing touches✅ Passed checks (3 passed)
✨ Finishing touches🧪 Generate unit tests (beta)
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PR Review: Enable Shakapacker Early HintsThank you for this PR! Here's my comprehensive review: SummaryThis PR enables HTTP/2 early hints support by updating dependencies to use the Code Quality & Best PracticesGood:
Concerns:
Potential Bugs & Issues
Performance ConsiderationsPositive:
Considerations:
Security ConcernsLow Risk Changes:
Recommendations:
Test CoverageCurrent State:
Recommendations:
Additional Recommendations
Action Items Before Merge
Overall AssessmentVerdict: Needs revision before merge The concept and implementation approach are sound, but there are several concerns that should be addressed:
Once these items are addressed, this should be a valuable performance improvement! Let me know if you need help with any of these recommendations. |
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🧹 Nitpick comments (1)
config/shakapacker.yml (1)
67-69: Add context and rationale for the early_hints configuration.The configuration enables early hints for production, which is aligned with the PR objective. However, the comment is minimal. Consider adding more detail:
- Explain what HTTP/2 Early Hints does (preloading critical resources)
- Note any performance or compatibility considerations
- Reference any related documentation or issues
Current implementation looks correct; this is a documentation enhancement request.
Consider updating the comment as follows:
# Cache manifest.json for performance cache_manifest: true # Early hints configuration # HTTP/2 Early Hints allows the server to proactively push resources # that the client is likely to need, improving perceived performance. # Requires HTTP/2 support and compatible browser/client. early_hints: enabled: true
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🔇 Additional comments (3)
Gemfile (2)
6-6: Clarify the reason for downgrading Ruby from 3.4.6 to 3.4.3.This is a patch-version downgrade without explanation. Confirm whether this is:
- A required dependency constraint from the new Shakapacker branch
- A security or compatibility fix
- An intentional change with a specific reason
If unintentional or not required, consider reverting to 3.4.6.
9-9: Feature branch is under active development, but dependency risks remain.The
justin808/early-hintsbranch exists and is actively maintained (last commit verified Oct 17, 2025). Issues #721–#722 for Early Hints support were opened Oct 14, 2025, indicating intentional ongoing development. However, using an unreleased feature branch in production dependencies poses real risks:
- Non-deterministic builds: Branch can change without notice; successive deployments may pull different code.
- Incomplete feature: Early Hints is not yet released in any stable Shakapacker version (latest: 8.3.0, April 2025).
- No guarantees: Unvetted development code may introduce breaking changes, security issues, or be abandoned.
If this is intentional for temporary testing, explicitly document the temporal nature and plan for either pinning to a specific commit hash or awaiting an official release. Otherwise, consider reverting to a stable released version.
package.json (1)
95-95: Confirm intentionality of branch-based dependency and align Gemfile and package.json if upgrading.Both Gemfile and package.json consistently use
shakacode/shakapacker#justin808/early-hints, which currently resolves to version9.3.0.beta.2. While stable releases exist (9.1.0,9.2.0), the branch-based approach does introduce production risks: non-deterministic builds, unvetted pre-release code, and branch-dependent maintenance.Verify that this branch-based approach is intentional for the early-hints feature development. If migrating to a released version, update both files together to maintain consistency across your dependency management.
Updated Ruby version from 3.4.3 to 3.4.6 to match CI environment expectations. This fixes the bundle install failure in GitHub Actions. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
PR Review: Enable Shakapacker early hintsI've reviewed this PR and here's my comprehensive feedback: Overall AssessmentThis is a clean and focused PR that enables HTTP/2 Early Hints support for asset preloading. The changes are well-scoped and follow a logical pattern. Code Quality and Best PracticesStrengths:
Recommendations:
Performance ConsiderationsPositive Impact:Early Hints is excellent for performance:
Important Requirements:HTTP/2 Support Required:
Action Required:
Potential Bugs or IssuesCritical: Compatibility Check Needed
Security ConcernsLow Risk:
Considerations:
Test CoverageMissing Tests:Currently, there are no tests included for this feature. This is concerning for a production configuration change. Recommended Test Coverage:
Action Items SummaryBefore Merging:
Nice to Have:
ConclusionThis is a good quality PR with clear intent and clean implementation. The Early Hints feature should provide meaningful performance improvements for users on HTTP/2 connections. Main concerns:
Recommendation: Approve with conditions - Address the HTTP/2 verification and testing checklist before deploying to production. Great work on keeping the changes focused and well-organized! |
When installing shakapacker from a GitHub branch, the TypeScript source needs to be compiled. Added a postinstall script that: 1. Detects if shakapacker was installed from source (has .ts but no .js files) 2. Installs shakapacker's dev dependencies 3. Runs the build script to compile TypeScript to JavaScript This ensures the package is properly built even when installed directly from GitHub instead of npm. Also updated shakapacker reference to use explicit github: prefix for clarity. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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package.json (2)
20-20: Verify the postinstall build produces the expected shakapacker bundle.The conditional build logic assumes that building shakapacker in
node_moduleswill produce a functional bundle. Confirm that:
- The
yarn buildstep in shakapacker completes successfully- The resulting
index.jsis actually generated and usable by the asset pipeline- No build artifacts are missing or corrupted
Test this locally on both Mac/Linux and Windows (or WSL) by running
yarn installand verifying the bundle integrity.
95-95: <!-- [scratchpad]
[task review_dependency_pinning 1/1]
Verify concerns about shakapacker branch pinning.[observations]
- Repository: react-webpack-rails-tutorial (by shakacode)
- Dependency: "shakapacker": "github:shakacode/shakapacker#justin808/early-hints"
- Branch justin808/early-hints is ACTIVE and recently updated (Oct 17, 2025)
- Latest commit: 6bf6bf5
- postinstall script present: builds shakapacker from source if needed
- yarn.lock is committed (visible from script output)
- Only GitHub dependency in package.json
- Recent commit message: "Add postinstall script to build shakapacker from GitHub branch"
[analysis]
- Review comment is technically correct: branch refs are mutable, commits are more reproducible
- HOWEVER: Context matters significantly here
- This is a tutorial repo testing an unreleased feature from upstream shakapacker
- postinstall script + committed yarn.lock already provide reproducibility guarantees
- The branch reference is intentional, not accidental
- This is a legitimate pattern for feature-branch testing before stable release
- Pinning to commit 6bf6bf5 would actually be worse if developers want to test updates
[conclusion]
Review comment's concern is valid but overly rigid for this development/testing scenario. The current setup mitigates the stated risks through:
- Committed yarn.lock (deterministic installs)
- postinstall build script (explicit build process)
- Active upstream maintenance
The developer should make an informed decision about whether this temporary feature-branch reference aligns with their project's dependency strategy.[done]
Verification complete. This is not an error or broken practice—it's an intentional development setup that requires developer confirmation of intent.
</scratchpad]Confirm whether pinning shakapacker to the feature branch is intentional and acceptable for your project's current development phase.
The review comment's concern about branch mutability is technically valid; however, your setup already mitigates the key reproducibility risks:
- yarn.lock is committed, making installs deterministic
- postinstall script builds shakapacker from source, showing deliberate integration testing
- Branch justin808/early-hints is active and maintained (latest commit: 6bf6bf5, updated Oct 17, 2025)
This is a legitimate pattern for testing unreleased features from an upstream branch before a stable release. If you plan to stay on this branch temporarily while testing early-hints, the current approach is acceptable. However, you should:
- Document in a comment why this branch reference exists (e.g., "TODO: pin to shakapacker release once early-hints merges")
- Plan to upgrade to a stable shakapacker release once the feature ships
- If you want extra safety now, pin to the specific commit (
#6bf6bf5) with a comment explaining it's temporary
| "homepage": "https://github.com/shakacode/react-webpack-rails-tutorial", | ||
| "scripts": { | ||
| "postinstall": "patch-package", | ||
| "postinstall": "patch-package && if [ -f node_modules/shakapacker/package/index.ts ] && [ ! -f node_modules/shakapacker/package/index.js ]; then cd node_modules/shakapacker && yarn install --production=false && yarn build; fi", |
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Postinstall script uses Unix shell syntax; will not work on Windows.
The postinstall script uses bash conditionals and Unix paths that will fail on Windows systems (even with Git Bash). If this project supports Windows developers, this needs a cross-platform solution (e.g., using Node.js scripts or a cross-platform shell runner like cross-env).
Consider refactoring this into a Node.js script or using a tool like node-shell-script or platform-specific fallbacks. Alternatively, document that Windows developers must use WSL.
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 9fca254 🎮 Control Plane Console |
Pull Request Review: Enable Shakapacker Early HintsThank you for this PR! I've reviewed the changes to enable early hints support in Shakapacker. Here's my detailed feedback: ✅ Code Quality & Best PracticesStrengths:
Concerns:
🐛 Potential Bugs & Issues
⚡ Performance ConsiderationsPositive Impacts:
Potential Issues:
🔒 Security Concerns
🧪 Test CoverageCurrent State:
Recommendations:
📝 Additional Recommendations
🎯 SummaryOverall Assessment: This is a well-intentioned performance optimization with clean implementation. However, it needs additional validation and testing before production deployment. Recommendation: Request Changes Required Before Merge:
Nice to Have:
Files Changed Review:
Great work on exploring performance optimizations! Please address the testing and documentation concerns before merging. Review generated with assistance from Claude Code |
Updated Gemfile.lock and yarn.lock to pick up the latest changes from the shakapacker justin808/early-hints branch. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit eb1b3be 🎮 Control Plane Console |
Pull Request Review: Enable Shakapacker Early HintsOverviewThis PR updates the project to use a development branch of Shakapacker that includes early hints support, and enables the early hints feature in production. The changes are focused on dependency updates and configuration. Code Quality & Best Practices✅ Strengths
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Add debug: true to early hints configuration to output debug info as HTML comments in production, making it easier to verify that early hints are working correctly. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 9930aaf 🎮 Control Plane Console |
Pull Request Review: Enable Shakapacker Early HintsThank you for this PR! I've reviewed the changes to enable early hints support via the shakapacker branch. Here's my detailed feedback: ✅ Positive Aspects
🔍 Code Quality & Best Practices1. PostInstall Script (package.json:20)The postinstall script has grown quite complex. This one-liner is hard to read and maintain. Concerns:
Recommendations:
2. Branch Dependency ManagementUsing a GitHub branch as a dependency is appropriate for testing/preview, but: Concerns:
Recommendations:
3. Early Hints Configuration (config/shakapacker.yml:67-70)The configuration looks good, but could use more documentation. Recommendations:
🐛 Potential Issues1. Ruby Version Change (Gemfile.lock)I noticed the Ruby version patch changed from 3.4.6p32 to 3.4.6p54. This appears to be an unintentional side effect rather than a deliberate change. Impact: Low - same minor/patch version 2. Yarn.lock ChangesThe yarn.lock shows all resolved URLs changed format. This is cosmetic but suggests a potential yarn version inconsistency. Recommendation: Ensure all developers are using the same yarn version (currently specified as 1.22.22 in package.json) 🔒 Security Considerations1. Branch Dependency Security✅ Good: Using a specific commit in the lock file provides reproducible builds Recommendations:
2. Build Script ExecutionThe postinstall script runs arbitrary build commands from a third-party package. Impact: Low (trusted source - shakacode) ⚡ Performance Considerations1. Install TimeThe postinstall script conditionally builds shakapacker from source, which:
Recommendations:
2. Early Hints Benefits✅ This is the whole point of the PR! Early hints should provide measurable performance improvements. Recommendations:
🧪 Testing & VerificationThe PR description has a testing checklist, which is great! However: Missing Test Coverage:
Recommendations:
📋 SummaryOverall Assessment: This is a solid PR with a clear purpose and systematic implementation. The main concerns are around the complexity of the postinstall script and the temporary nature of using a branch dependency. Priority Recommendations:
Approval Status: Great work on improving the application's performance! Let me know if you'd like help implementing any of these suggestions. |
Refreshed Gemfile.lock and yarn.lock to pull in the latest changes from shakapacker's justin808/early-hints branch. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 395b7a4 🎮 Control Plane Console |
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PR Review: Enable Shakapacker Early Hints Overview: This PR enables HTTP/2 early hints support in Shakapacker to improve perceived page load performance by allowing the server to send link headers early in the response lifecycle. Code Quality - Positive aspects:
Suggestions:
Potential Issues:
Performance Considerations: Positive:
Considerations:
Security Concerns (Overall: Low Risk):
Test Coverage Concerns:
Additional Recommendations:
Summary: Verdict: Approve with minor suggestions This PR is well-structured and implements a useful performance feature. The main concerns are:
Before merging:
After merging:
Great work on improving performance! |
Updated to commit 9a55db5d7c798154ecc2a95121ef3afa63f1e13e from shakapacker's justin808/early-hints branch. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 58f9d8e 🎮 Control Plane Console |
Pull Request Review: Enable Shakapacker Early HintsOverviewThis PR enables HTTP/2 Early Hints support for Shakapacker by updating dependencies to use the justin808/early-hints branch and configuring the feature in production. Overall, this is a positive change that should improve perceived page load performance. Summary of Changes
Code Quality and Best PracticesStrengths
Areas for Improvement1. Temporary Dependency Configuration 2. Postinstall Script Complexity 3. Configuration Documentation Potential Bugs or IssuesMedium Priority
Low Priority
Performance ConsiderationsPositive Impact
Potential Concerns
Recommendation: Document server requirements in PR description or README Security ConcernsGenerally safe - no major security concerns identified. Minor Considerations:
Test CoverageMissing automated tests. The PR description has a testing checklist but no automated test coverage. Recommendations:
Additional RecommendationsDocumentation
Deployment Strategy
Future Improvements
ConclusionThis is a well-structured PR that adds a valuable performance feature. The implementation is clean and the commit history shows good iteration. Approve with Minor ChangesBefore Merging:
After Merging:
Great work on implementing early hints support! |
Updated to commit 915edce51481bb1135853f9b877fd243623a9820 from shakapacker's justin808/early-hints branch. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Pull Request Review: Enable Shakapacker Early HintsSummaryThis PR enables early hints support by switching to a development branch of Shakapacker. Overall, the implementation looks reasonable for experimental/development purposes, but there are several important considerations before merging. Code Quality & Best PracticesStrengths
Concerns1. Using a Development Branch in Production (Critical)Files: Gemfile:9, package.json:95 Both Ruby and Node dependencies point to a feature branch (justin808/early-hints) rather than a stable release. Issues:
Recommendation:
2. Complex postinstall Script (Medium Priority)File: package.json:20 The postinstall script is complex and fragile:
Questions:
Recommendations:
3. Debug Mode in Production (Security/Performance)File: config/shakapacker.yml:70 Debug mode is enabled in production config which may leak information about asset loading, timing, or internal paths through HTML comments. Recommendation: Set debug: false for production or make it environment-variable controlled Potential Bugs & Issues1. Gemfile.lock Ruby Version Change (Low Priority)The Ruby version changed from 3.4.6p32 to 3.4.6p54. Was this intentional? 2. Missing Error Handling
Performance ConsiderationsPositive Impacts
Concerns
Recommendations:
Security Concerns1. Supply Chain Risk (High Priority)
Mitigation:
2. Information Disclosure (Low Priority)
3. Dependency AuditRun security audits: bundle audit and yarn audit Test CoverageMissing TestsThe PR description shows an incomplete testing checklist Recommendations:
Additional Recommendations1. Documentation
2. Server RequirementsEarly hints require:
Action: Verify production infrastructure supports early hints 3. Monitoring
Summary & VerdictBlocking Issues (Must Fix Before Merge)
Non-Blocking Recommendations
Questions for Author
ConclusionThe early hints feature is a valuable performance optimization, but this PR introduces significant stability and security risks by depending on an unmerged development branch. I recommend either:
The code quality is good, but the deployment approach needs refinement for production use. |
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 8082229 🎮 Control Plane Console |
Added --early-hints flag to all Procfile configurations to enable Puma's early hints support. This allows Rails to send HTTP 103 Early Hints responses with preload headers for better performance. Updated files: - Procfile (production) - Procfile.dev - Procfile.dev-prod-assets - Procfile.dev-static - Procfile.dev-static-assets 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 0104fb1 🎮 Control Plane Console |
Pull Request Review: Enable Shakapacker Early HintsThank you for this PR! I have completed a comprehensive review of the changes to enable early hints functionality. Strengths
Code Quality and Best PracticesGemfile/package.json Changes:
shakapacker.yml Configuration:
Procfile Changes:
package.json postinstall Script:
Potential Issues
Security Considerations
Performance ConsiderationsPositive Impacts:
Potential Concerns:
Test Coverage
RecommendationsHigh Priority:
Medium Priority: Low Priority: Overall AssessmentThis is a solid PR that properly implements early hints support across the application. Main concerns:
RECOMMENDATION: Approve with changes - Address the debug mode concern and complete manual testing, then this is good to merge. The implementation is technically sound and follows good practices. The early hints feature should provide measurable performance improvements once deployed. Review generated with Claude Code |
Removed --early-hints flag from development-only Procfiles. Kept it in: - Procfile (production deployment) - Procfile.dev-prod-assets (local testing with production assets) Early hints are most useful in production and when testing with production-compiled assets. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 56d2a68 🎮 Control Plane Console |
Pull Request Review: Enable Shakapacker Early HintsSummaryThis PR enables HTTP Early Hints support by switching to a development branch of Shakapacker and configuring the application to use this experimental feature. Early hints can improve perceived page load performance by allowing the server to send link headers before the full response is ready. Code Quality & Best Practices✅ Strengths
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Added --early-hints flag to the Rails server command in the Control Plane Dockerfile. This enables Puma to send HTTP 103 Early Hints responses in production, allowing browsers to preload assets while the server is still preparing the HTML response. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit b6255d5 🎮 Control Plane Console |
Pull Request Review - Enable Shakapacker Early HintsThank you for implementing HTTP Early Hints support! This is an excellent performance optimization. Below is my comprehensive review: ✅ Code Quality & Best PracticesStrengths:
Recommendations:
🐛 Potential Bugs & Issues
⚡ Performance ConsiderationsPositives:
Concerns:
🔒 Security Concerns
🧪 Test CoverageGaps Identified:
📋 Additional Recommendations
📊 Summary
🎯 Action ItemsHigh Priority:
Medium Priority: Low Priority: Overall Assessment: This is a valuable performance feature that's well-implemented. The main concerns are around security (branch dependencies, debug mode), testing (lack of automation), and documentation. With the recommended changes, this will be production-ready. Great work on implementing HTTP Early Hints! 🚀 |
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🧹 Nitpick comments (1)
.controlplane/Dockerfile (1)
82-82: Ensure early hints dependencies are properly staged in the Docker build.The early hints feature depends on the shakapacker GitHub branch (installed at line 44 via
yarn install) and config/shakapacker.yml early_hints settings being applied during asset precompilation (line 74). Verify that:
- The postinstall script in package.json (conditional build logic) completes successfully during the
yarn installstep- The
bin/rails assets:precompileat line 74 picks up the early_hints configuration from config/shakapacker.yml- The final image has all necessary early-hints-enabled assets
If the build fails, I can help diagnose the postinstall script or asset precompilation issues.
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.controlplane/Dockerfile (1)
82-82: Verify Rails/Puma versions support the--early-hintsflag - CONFIRMED.Puma 3.11.0+ is required to use early hints, and your Gemfile specifies Rails 8.0 with Puma unpinned. Since Early-Hints requires Puma 3.11.0+ and the latest Puma versions far exceed this minimum, the dependencies are satisfied. The CMD modification is correct and consistent with the Procfile changes.
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Changes
Gemfileto point toshakapackerfrom thejustin808/early-hintsbranch.package.jsonto useshakapackerfrom thejustin808/early-hintsbranch.early_hintsinconfig/shakapacker.ymlfor the production environment.Testing
This change is
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Release Notes
Performance
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Results when