Enable Shakapacker early hints #687
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WalkthroughAdds Thruster HTTP/2 proxy integration: introduces the thruster gem, routes Rails startup through Thruster in Procfiles and Dockerfile, enables Shakapacker early_hints, adds Early Hints verification scripts, updates UI footer, and adds extensive Thruster / Early Hints documentation and Control Plane guidance. Changes
Sequence Diagram(s)sequenceDiagram
participant Browser
participant Thruster as Thruster (HTTP/2)
participant Rails as Rails (Puma/Container)
Note over Thruster,Rails: Thruster is the HTTP/2 frontend/proxy\nRails remains HTTP/1.1 backend
Browser->>Thruster: HTTP/2 request
Thruster->>Rails: proxied HTTP/1.1 request
Rails->>Thruster: 103 Early Hints + Link headers
Thruster-->>Browser: HTTP/2 103 Early Hints
Rails->>Thruster: 200 OK + body
Thruster-->>Browser: HTTP/2 200 OK + body
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Areas to focus review on:
Possibly related issues
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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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Actionable comments posted: 0
🧹 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.
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! |
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🔇 Additional comments (2)
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
🎉 ✨ 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 |
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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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🎉 ✨ 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. |
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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! |
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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! |
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. |
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Switch from using the published beta.12 gem to using the tip of master branch from the shakacode/react_on_rails GitHub repository. This ensures we have the latest fixes and improvements from the master branch, including any recent updates beyond beta.12. - Change Gemfile to point to GitHub master branch - Update Gemfile.lock to use commit 2306825e09d761a88fdd20960e5d5072bc753293 - npm package remains at 16.2.0-beta.12 (matching gem version) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull Request Review: Enable Shakapacker Early HintsThank you for this comprehensive PR implementing HTTP/2 and Early Hints support via Thruster! ✅ Strengths
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🐛 Potential Issues & 🧪 Test Coverage1. Beta/Unreleased Dependencies
Risk: Master branch may have unreleased bugs, breaking changes, or lack of semantic versioning guarantees. Recommendation: Document why master is required, consider requesting a formal release or using a specific commit SHA. 2. Missing Test Coverage
Recommendation: Add minimal test coverage for Thruster proxy functionality, Early Hints header presence in production environment, and Footer component rendering. 3. Verification Scripts Not IntegratedThe check_early_hints.js and check_early_hints.py scripts are useful but:
📊 Performance ConsiderationsExpected Benefits (from testing): 20-30% faster initial page loads, 40-60% reduction in transfer size, improved caching Consider adding: Performance metrics collection (Core Web Vitals), Early Hints header validation in production, asset load timing monitoring See next comment for recommendations... |
🎯 Recommendations SummaryMust Fix (Before Merge):
Should Fix (High Priority):
Nice to Have:
✅ ConclusionThis is a well-researched and thoroughly documented PR that brings significant performance improvements. The documentation quality is excellent, and the implementation shows good understanding of the Thruster/HTTP/2/Early Hints stack. However, there are critical security concerns around SECRET_KEY_BASE handling that must be addressed before merging. The debug mode in production and lack of test coverage are also concerns that should be addressed. Verdict: Once the security issues are resolved, this will be an excellent addition to the project. Review conducted by: Claude Code (Automated Review) |
- Increase Procfile.dev sleep timers from 5s to 15s to ensure ReScript initial build completes - Comment out redis-server in Procfile (run as system service instead) - Add locale generation to build_production_command - Change dev_server.https to dev_server.server in shakapacker.yml - Disable ReactRefreshWebpackPlugin for rspack compatibility - Add comments documenting Procfile processes Related to precompile hook coordination issues: - shakacode/shakapacker#849 - shakacode/react_on_rails#2090 - shakacode/react_on_rails#2091 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 1dea0e6 🎮 Control Plane Console |
PR Review: Enable Shakapacker Early Hints with Thruster HTTP/2OverviewThis PR adds comprehensive HTTP/2 and early hints support through Thruster integration and Shakapacker configuration. The implementation is well-documented and shows good attention to deployment concerns. 🟢 Strengths1. Excellent Documentation
2. Thoughtful Infrastructure Changes
3. Configuration Improvements
🟡 Concerns & Issues1. SECURITY: Hardcoded SECRET_KEY_BASE in Templates
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Updated from revision 2306825e to 1969b2d22 to get latest changes from master branch. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull Request ReviewThank you for this comprehensive PR implementing Thruster HTTP/2 proxy and Shakapacker early hints support! This is a significant enhancement with well-documented changes. Here's my detailed review: ✅ Strengths1. Excellent Documentation
2. Thoughtful Infrastructure Changes
3. Security Improvements
🔴 Critical Issues1. Insecure Placeholder SECRET_KEY_BASE in Production TemplateLocation: - name: SECRET_KEY_BASE
# For test apps, a placeholder value is fine. For production apps, this should be
# set to a secure random value using: openssl rand -hex 64
# Production apps should configure this manually after app creation via a secret.
value: 'placeholder_secret_key_base_for_test_apps_only'Issue: This hardcoded placeholder secret is a critical security vulnerability if accidentally used in production. Recommendation:
Suggested fix: - name: SECRET_KEY_BASE
# IMPORTANT: This MUST be set to a secure random value for ALL deployments
# Generate one using: openssl rand -hex 64
# For production, configure this via Control Plane secrets, NOT this template
# This placeholder will cause Rails to fail to start - this is intentional
value: 'CHANGEME_OR_DEPLOYMENT_WILL_FAIL'2. Using Master Branch Dependencies in ProductionLocation: gem "react_on_rails", github: "shakacode/react_on_rails", branch: "master"Issue: Depending on the
Recommendation:
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- Update react_on_rails to latest master (revision b50a74d9) - Fix headless Chrome mode by using --headless=new flag Chrome 109+ requires the new headless mode to work properly 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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PR Review: Enable Shakapacker Early HintsSummaryThis PR successfully migrates from using Puma with ✅ Strengths1. Excellent Documentation
2. Consistent Implementation
3. Performance Improvements
4. Good Security Practices
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🎉 ✨ Deploy Complete! 🚀🌐 ➡️ Open Review AppDeployment successful for PR #687, commit 27ddc09 🎮 Control Plane Console |
- Update react_on_rails to latest master (revision b50a74d9) - Fix headless Chrome by using custom :headless_chrome driver Capybara's built-in :selenium_chrome_headless uses old --headless flag Chrome 109+ requires --headless=new for proper headless operation - Renamed driver to avoid conflicts with Capybara's built-in driver 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Pull Request Review: Enable Shakapacker Early HintsOverall AssessmentThis is a comprehensive and well-executed PR that successfully integrates Thruster HTTP/2 proxy and enables early hints support. The implementation demonstrates strong attention to detail with excellent documentation, proper error handling, and thorough testing infrastructure. While there are some areas for improvement, the overall quality is very high. Recommendation: Approve with minor suggestions ✅ Code Quality & Best Practices✅ Strengths
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Break build_production_command assignment across two lines to satisfy the 120 character max line length requirement. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Pull Request Review: Enable Shakapacker Early HintsThis PR introduces Thruster HTTP/2 proxy and early hints configuration. Overall, this is a well-executed implementation with excellent documentation. ✅ Strengths
🔴 Critical Security Concerns1. SECRET_KEY_BASE Placeholder in ProductionFile: .controlplane/templates/app.yml:23-26 The hardcoded placeholder should NEVER be used in production. It completely compromises session security. Recommendation:
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Pull Request Review: Enable Shakapacker Early HintsThis PR introduces Thruster HTTP/2 proxy integration and early hints support, along with Ruby 3.4.6 upgrade and dependency updates. Overall, this is a well-structured PR with comprehensive documentation. Below is detailed feedback across different aspects: ✅ Strengths
🔍 Code Quality & Best PracticesDocker Configuration (
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| Category | Rating | Notes |
|---|---|---|
| Code Quality | ⭐⭐⭐⭐☆ | Well-structured with minor issues |
| Security | ⭐⭐⭐☆☆ | Concerns about SECRET_KEY_BASE handling and git dependencies |
| Performance | ⭐⭐⭐⭐⭐ | Excellent performance improvements expected |
| Testing | ⭐⭐⭐☆☆ | Needs automated tests for new functionality |
| Documentation | ⭐⭐⭐⭐⭐ | Exceptional documentation |
Recommendation: Approve with Changes
This PR introduces valuable performance improvements and is well-documented. However, please address:
Must Fix Before Merge:
- Add
wsto package.json dev dependencies - Remove duplicate
infer_spec_type_from_file_location!in rails_helper.rb - Complete manual testing checklist items
- Verify production
SECRET_KEY_BASEis properly configured
Should Fix Before Merge:
5. Set early_hints.debug: false for production or make it environment-aware
6. Add tests verifying Thruster integration works correctly
Nice to Have:
7. Use commit SHA instead of branch for react_on_rails gem
8. Improve cross-platform documentation for Redis setup
9. Add error handling to verification scripts
Great work on this feature! The Thruster integration and comprehensive documentation will be valuable for the project. 🚀
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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