feat: detect package manager from lockfiles (#22) #42
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Add automatic package manager detection based on lockfile presence when the packageManager property is not set in package.json. This provides a better default experience by using the package manager that's already in use in the project. Detection priority: 1. bun.lockb - Bun 2. pnpm-lock.yaml - pnpm 3. yarn.lock - Yarn (detects Berry vs Classic from file format) 4. package-lock.json - npm If no lockfile is found, falls back to PACKAGE_JSON_FALLBACK_MANAGER environment variable or npm. Fixes #22 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
WalkthroughAutomatic package manager detection was added when packageManager is absent: the code checks lockfiles in priority order (bun.lockb, pnpm-lock.yaml, yarn.lock with Berry vs Classic detection by inspecting yarn.lock content, then package-lock.json) and falls back to PACKAGE_JSON_FALLBACK_MANAGER or npm if none found. README, tests, changelog, and type signatures were updated. Changes
Sequence Diagram(s)sequenceDiagram
participant Caller as Caller
participant Determiner as determine_package_manager
participant Parser as parse_package_manager
participant LockDetector as detect_manager_from_lockfile
participant YarnDetector as detect_yarn_version_from_lockfile
rect rgb(245,250,255)
Caller->>Determiner: request manager (package.json may include packageManager)
end
alt packageManager present
Determiner->>Parser: parse "name@version" (or name)
Parser-->>Determiner: resolved manager symbol (yarn→Yarn variant via determine_yarn_version)
else packageManager absent
Determiner->>LockDetector: check lockfiles in priority
alt bun.lockb found
LockDetector-->>Determiner: :bun
else pnpm-lock.yaml found
LockDetector-->>Determiner: :pnpm
else yarn.lock found
LockDetector->>YarnDetector: read head (up to N bytes)
YarnDetector-->>LockDetector: :yarn_berry or :yarn_classic
LockDetector-->>Determiner: yarn variant
else package-lock.json found
LockDetector-->>Determiner: :npm
else no lockfiles
LockDetector-->>Determiner: nil
end
end
alt manager resolved
Determiner-->>Caller: return resolved manager
else fallback
Determiner-->>Caller: return fallback (PACKAGE_JSON_FALLBACK_MANAGER or npm)
end
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes
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Code Review - PR #42: Lockfile Detection FeatureOverviewThis PR adds automatic package manager detection based on lockfile presence. The implementation is well-structured and addresses a real UX pain point. Overall, this is a solid contribution with good test coverage. Strengths
Code Quality ObservationsGood Practices
Potential Issues1. File I/O Efficiency (lib/package_json.rb:124)Reading 1000 characters might be inefficient. Reading 200-300 characters should be sufficient to detect __metadata: which typically appears within the first few lines of Yarn Berry lockfiles. 2. Redundant File Existence Check (lib/package_json.rb:119)The file existence check is redundant since the caller already verifies the file exists. Either remove or add a comment explaining defensive programming. 3. Fragile Yarn Version Detection (lib/package_json.rb:127)Using string matching on lockfile content is fragile. Consider additional validation for edge cases like corrupted lockfiles or future Yarn versions. 4. Missing Error Handling (lib/package_json.rb:124)No error handling for file read failures. Consider wrapping in a rescue block and defaulting to :yarn_classic on errors. Test CoverageExcellent coverage for individual lockfile detection, priority ordering, and Yarn differentiation. Missing edge cases:
Security & PerformanceNo security concerns. Performance is acceptable. Minor optimizations possible by reducing read size. RecommendationsShould Fix (Before Merge):
Could Fix (Nice to Have):
Final VerdictAPPROVE with minor suggestions. Well-implemented feature with clean code and good tests. Suggested improvements are defensive enhancements that would make the code more robust but do not block merging. |
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lib/package_json.rb (1)
117-131: Correct implementation of Yarn version detection.The logic correctly uses the
__metadata:marker to distinguish Yarn Berry from Classic. Reading the first 1000 characters is sufficient since__metadata:typically appears at the very beginning of Berry lockfiles. Defaulting to Classic when the marker is absent is a reasonable fallback.Optionally, the comment on lines 122-123 could be simplified for clarity:
- # Read the first few lines to determine the version - # Yarn Berry lockfiles start with "__metadata:" or have "# yarn lockfile v1" but use a different format - # Yarn Classic lockfiles start with "# THIS IS AN AUTOGENERATED FILE" and "# yarn lockfile v1" + # Yarn Berry lockfiles contain "__metadata:" (typically at the start) + # Yarn Classic lockfiles use an older format without this marker
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🔇 Additional comments (6)
README.md (1)
88-111: Excellent documentation of the new lockfile detection feature!The documentation clearly explains the automatic detection flow, priority ordering, and fallback behavior. The examples for using
fallback_managerwith bothreadandnewconstructors are helpful for users.lib/package_json.rb (3)
75-87: Clean implementation of the detection hierarchy!The three-tier logic (explicit packageManager → lockfile detection → fallback) is well-structured and easy to follow. The early returns keep the code readable.
89-95: Good refactoring to extract parsing logic.Separating the parsing of the
packageManagerproperty into its own method improves code organization and readability.
97-115: Solid implementation of lockfile detection with correct priority ordering.The method correctly implements the documented priority (bun.lockb → pnpm-lock.yaml → yarn.lock → package-lock.json) and appropriately delegates Yarn version detection to a separate method.
spec/package_json_spec.rb (2)
139-222: Comprehensive test coverage for lockfile detection!The tests thoroughly cover all key scenarios:
- Individual lockfile detection for each package manager (npm, pnpm, Bun, Yarn Classic, Yarn Berry)
- Priority ordering when multiple lockfiles are present
- Yarn Berry vs Classic distinction using appropriate file content
- Verification that lockfile detection takes precedence over fallback_manager
The test descriptions are clear and the assertions are correct.
386-437: Excellent consistency between.readand.newconstructor tests.The tests correctly mirror the lockfile detection behavior for the
.newconstructor, ensuring both code paths handle lockfile detection consistently. The test coverage confirms that lockfile detection takes precedence over thefallback_managerparameter in both cases.
- Reduce File.read size from 1000 to 300 chars for efficiency - Add error handling for corrupted/unreadable lockfiles - Add tests for error scenarios to improve branch coverage - Default to Yarn Classic on read errors Addresses code review feedback. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Code ReviewI've reviewed PR #42 which adds automatic package manager detection from lockfiles. Overall, this is a well-implemented feature with excellent test coverage. Here's my detailed feedback: ✅ StrengthsCode Quality
Documentation
Backward Compatibility
🔍 Observations & Suggestions1. Yarn Version Detection Heuristic (lib/package_json.rb:117-133)The Potential Issue: While 300 bytes is likely sufficient, very large comments at the start of a yarn.lock could theoretically push Suggestion: Consider reading more bytes (e.g., 1000) or reading line-by-line until you find a meaningful line. Alternatively, document this as a known limitation. Current code: content = File.read(lockfile_path, 300) # Read first 300 charsAlternative approach (more robust): # Read first 1000 bytes to be more confident
content = File.read(lockfile_path, 1000)2. File I/O Performance (lib/package_json.rb:97-115)The Analysis: This is fine for most use cases since these are lightweight filesystem calls. However, if this code is called frequently in tight loops, it could add up. Current behavior: Sequential checks (appropriate for this use case)
No action needed, but worth noting for future optimization if performance becomes a concern. 3. Test Coverage for Edge CasesWhat's covered: ✅
Potential additional test (nice to have, not critical):
Current test at line 192-201 handles the unreadable case well by using a mock. 4. Security ConsiderationsFile read safety: ✅ The code only reads 300 bytes, limiting potential DoS from extremely large files Good practice: The 5. Priority Order RationaleThe chosen priority order (
Question for consideration: Is there a scenario where multiple lockfiles legitimately exist? The tests verify the priority works, but users might appreciate a warning if multiple lockfiles are detected (optional enhancement). 🐛 Potential IssuesNone CriticalI did not identify any critical bugs or security vulnerabilities. The code is solid. 📊 Performance ConsiderationsFile I/O: 1-4 filesystem stat calls per initialization - negligible performance impact 🧪 Test CoverageExcellent test coverage:
The tests verify behavior changes correctly across the codebase. 🎯 RecommendationsRequired Before MergeNone - the PR is ready to merge as-is. Optional Enhancements (Future PRs)
✨ SummaryThis is a high-quality PR that:
Recommendation: Approve and merge 🚀 The code quality is excellent, and the feature will improve the developer experience significantly by reducing configuration overhead. Note: I couldn't run RuboCop and the test suite in the review environment, but based on the PR description stating "All 307 existing tests pass" and the code following Ruby conventions, I trust these have been verified. |
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spec/package_json_spec.rb (1)
397-459: Consider adding priority tests to the .new context.The lockfile detection tests for individual package managers are appropriately duplicated between
.read(lines 147-190) and.new(lines 397-448) contexts. However, the priority ordering tests (lines 203-233 in the.readcontext) are not duplicated in the.newcontext.Since both constructors use the same
determine_package_managerlogic, consider adding the priority tests to the.newcontext as well for completeness and consistency.
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🔇 Additional comments (6)
spec/package_json_spec.rb (2)
139-139: LGTM: Clear test description.The updated description explicitly states the condition under which the fallback manager is used, improving test clarity.
147-233: LGTM: Comprehensive lockfile detection tests.The test coverage is thorough:
- All supported package managers (npm, pnpm, bun, yarn classic, yarn berry) are tested
- Priority ordering is validated with multiple lockfiles present
- Error handling is properly tested using mocking
- Each test uses a different fallback_manager to ensure lockfile detection takes precedence
lib/package_json.rb (4)
75-87: LGTM: Clear priority hierarchy.The package manager determination logic follows the correct priority:
- Explicit
packageManagerproperty in package.json- Lockfile detection
- Fallback manager
This maintains backward compatibility while adding the new lockfile detection feature.
89-95: LGTM: Good refactoring.Extracting
parse_package_managerimproves code organization and makes the logic flow indetermine_package_managerclearer.
97-115: LGTM: Well-defined priority order.The lockfile detection priority is logical and well-implemented:
bun.lockb(binary, most specific)pnpm-lock.yaml(pnpm-specific)yarn.lock(requires version detection)package-lock.json(npm default)The implementation is clean and straightforward.
117-133: LGTM: Solid Yarn version detection with safe error handling.The implementation correctly distinguishes Yarn Berry from Yarn Classic by checking for
__metadata:in the lockfile. The error handling appropriately defaults to Yarn Classic, which is a safe fallback.The 300-character read limit appears sufficient for detecting the
__metadata:marker that Yarn Berry places near the beginning of lockfiles, and this optimization avoids reading potentially large files.
Increase File.read size from 300 to 1000 bytes in detect_yarn_version_from_lockfile to handle edge cases with large initial comments in yarn.lock files. This provides better coverage while maintaining good performance. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Pull Request Review: Lockfile-based Package Manager DetectionI've reviewed PR #42 and overall this is a well-designed and implemented feature. The automatic package manager detection based on lockfiles is a useful enhancement that improves the developer experience. Here's my detailed feedback: ✅ Strengths
🔍 Areas for Improvement1. Missing RBS Type Signatures (Medium Priority)The new private methods are not reflected in the RBS type signature file. According to CLAUDE.md, "Everything should be captured in the type definitions, including private methods." The following method signatures should be added to def parse_package_manager: (String package_manager) -> Symbol
def detect_manager_from_lockfile: () -> Symbol?
def detect_yarn_version_from_lockfile: () -> Symbol
def determine_yarn_version: (String version) -> Symbol2. Potential Edge Case: Race Condition (Low Priority)File: There's a minor TOCTOU (time-of-check-time-of-use) issue: if Consider checking file existence within 3. Magic Number Documentation (Low Priority)File: While the comment explains the reasoning, consider making this a named constant for better maintainability: LOCKFILE_DETECTION_READ_SIZE = 1000 # bytes🔒 Security Review✅ No security concerns identified
⚡ Performance Considerations✅ Performance looks good
📋 RecommendationsMust Fix:
Should Fix:
Nice to Have:
📊 SummaryThis is a high-quality PR that's ready to merge with one recommended fix (RBS signatures). The implementation is clean, well-tested, and follows Ruby best practices. The feature provides real value without introducing breaking changes or security concerns. Rating: 9/10 ⭐ Great work on this enhancement! The lockfile detection will significantly improve the out-of-box experience for developers. Next Steps:
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lib/package_json.rb (1)
117-134: Good implementation with solid error handling.The
__metadata:marker is a reliable way to distinguish Yarn Berry from Classic. The 1000-byte read limit is a reasonable performance optimization that should cover the vast majority of real-world lockfiles.The broad
rescue StandardErroris acceptable here for defensive coding, though you could optionally narrow it to specific exceptions (e.g.,Errno::ENOENT,Errno::EACCES,IOError) if you want more precise error handling.Optional refinement:
- rescue StandardError + rescue Errno::ENOENT, Errno::EACCES, IOError # On error (e.g., file read failure, corrupted lockfile), default to Yarn Classic :yarn_classic end
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🔇 Additional comments (5)
lib/package_json.rb (3)
78-87: LGTM! Clean refactoring of the detection flow.The new three-tier detection strategy (packageManager property → lockfiles → fallback) is well-structured and maintains backward compatibility while adding the requested lockfile detection feature.
89-95: LGTM! Clean extraction of packageManager parsing logic.The method correctly handles Yarn's version-specific behavior while keeping other package managers simple.
97-115: LGTM! Lockfile detection priority is correctly implemented.The prioritization (bun → pnpm → yarn → npm) is logical and well-documented in comments. The delegation to
detect_yarn_version_from_lockfileproperly handles Yarn's Berry vs Classic distinction.spec/package_json_spec.rb (2)
139-234: Excellent test coverage for lockfile detection!The tests comprehensively verify:
- Detection of each package manager type (npm, pnpm, bun, yarn classic, yarn berry)
- Priority ordering when multiple lockfiles exist
- Error handling for unreadable lockfiles
- Fallback behavior when no lockfiles are present
The test for unreadable yarn.lock (lines 192-201) using mocking is particularly good for covering error scenarios without needing actual file permission manipulation.
397-459: LGTM! Constructor path tests mirror the .read path coverage.These tests ensure that the lockfile detection behaves consistently whether using
PackageJson.readorPackageJson.new. The coverage is thorough and includes the important error handling case for unreadable lockfiles.
- Simplify detect_manager_from_lockfile with modifier if statements - Add ClassLength exclusion for PackageJson class to .rubocop.yml Addresses CI lint failures. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Code Review for PR #42This is a well-implemented feature. The implementation is clean, tests are comprehensive, and backward compatibility is maintained. Strengths
Minor Suggestions
Security & Performance
RecommendationAPPROVE - Ready to merge. Minor suggestions are optional improvements for future PRs. Great work! Reviewed with Claude Code |
- Add two new test cases for race condition scenario where yarn.lock disappears between lockfile detection and version detection - Update existing tests to use LOCKFILE_DETECTION_READ_SIZE constant instead of magic number 1000 - Achieves 100% branch coverage (up from 98.95%) - All 311 tests passing with 100% line and branch coverage 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Code Review - PR #42: Lockfile-based Package Manager DetectionOverall, this is a well-implemented feature with excellent test coverage and thoughtful design. The automatic detection of package managers from lockfiles is a valuable improvement that will enhance the developer experience. Here's my detailed feedback: ✅ Strengths1. Excellent Test Coverage
2. Clean Code Architecture
3. Robust Error Handling
4. Proper Documentation
5. Backward Compatibility
🔍 Observations & Suggestions1. RuboCop Configuration ChangeFile: The addition of Current approach: ✅ Acceptable for now 2. Lockfile Read Size ConstantFile: The Question: Have you tested this with real-world yarn.lock files that have extensive header comments? Some projects use lockfiles with large license headers. Suggestion: Consider adding a test case with a lockfile that has a large comment section to verify 1000 bytes is sufficient, or document the trade-off if it's intentionally limited. 3. Yarn Version Detection LogicFile: The detection logic using Minor optimization opportunity: # Current approach reads first, checks existence in rescue
# Consider: Check size before reading to avoid reading empty files
return :yarn_classic unless File.exist?(lockfile_path) && File.size(lockfile_path) > 0This would avoid attempting to read empty/nearly-empty files, though the current approach is perfectly fine. 4. Detection Priority RationaleFile: The priority order (bun > pnpm > yarn > npm) makes sense, but it's worth noting:
Documentation: The README documents this well. No changes needed, but you might consider adding a brief comment in the code explaining the rationale for this specific order. 5. Test Code QualityFile: The tests for error handling and race conditions are thorough and well-designed. Particularly impressed by:
Excellent work on edge case testing! 6. Potential Enhancement: Logging/WarningCurrently, when lockfile detection is used, there's no visibility to the developer that automatic detection occurred. Consider whether it would be helpful to:
This is not a blocker - just a potential future enhancement for debugging. 🛡️ Security ConsiderationsFile Reading Safety: The code reads lockfiles with a size limit ( No concerns identified - the implementation is safe. 🚀 Performance Considerations
Performance: ✅ Well-optimized 📋 Test Coverage AnalysisCoverage added:
Coverage is excellent! All critical paths and edge cases are tested. 🐛 Potential IssuesMinor: Gemfile.lock Platform AdditionFile: The addition of ✨ Overall AssessmentThis PR demonstrates:
Recommendation: APPROVE ✅ This is production-ready code. The implementation is solid, tests are thorough, and the feature addresses a real usability improvement. The only suggestions above are minor optimizations and potential future enhancements - none are blockers. Great work on this feature! The lockfile detection will provide a much better default experience for users. Files reviewed: 6
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Add changelog entry for PR #42 which adds automatic package manager detection from lockfiles with priority ordering and Yarn Berry/Classic detection. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Code Review - PR #42: Lockfile-based Package Manager DetectionI've reviewed this PR and overall it's a well-implemented feature with excellent test coverage. Here's my detailed feedback: ✅ Strengths1. Code Quality
2. Test Coverage
3. Error Handling
4. Documentation
5. Backward Compatibility
🔍 Potential Issues & Suggestions1. Security Consideration (Low Risk) content = File.read(lockfile_path, LOCKFILE_DETECTION_READ_SIZE)While 1000 bytes is reasonable, consider:
Recommendation: Consider reducing to 500 bytes or adding a more specific regex check for the YAML structure at the start of file. 2. Potential False Positive return :yarn_berry if content.include?("__metadata:")This could theoretically match if someone puts Recommendation: Use a more specific pattern like 3. Code Organization
This is fine for current scope, but could be extracted if more detection methods are added in the future. 4. RuboCop Exception While this is pragmatic, the class is growing. Consider whether some methods could be extracted to a separate concern/module in the future (e.g., 5. Edge Case: Empty Lockfiles
Current error handling should catch most of these, but worth noting. 6. Performance Consideration (Minor) For projects with no lockfile, this checks 4 different files sequentially. This is likely negligible in practice, but could be micro-optimized with a single directory read if needed. 🎯 Overall AssessmentQuality: ★★★★★ (5/5) This is production-ready code that:
Recommendations
ConclusionThis is a high-quality PR that adds valuable functionality to the gem. The implementation is solid, well-tested, and follows Ruby best practices. The few suggestions above are minor improvements rather than blockers. Recommendation: APPROVE ✅ Great work @justin808! 🎉 |
Wrap long changelog entry to meet line length requirements. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Code ReviewThis is an excellent PR that adds intelligent package manager detection from lockfiles. The implementation is well-thought-out, thoroughly tested, and maintains backward compatibility. Here's my detailed review: ✅ Strengths1. Code Quality
2. Best Practices
3. Test Coverage
4. Security & Robustness
5. Documentation
🔍 Minor Observations1. Method Extraction (Not Blocking) The
Consider extracting the original logic that was refactored: def determine_package_manager(fallback_manager)
package_manager = fetch("packageManager", nil)
return parse_package_manager(package_manager) unless package_manager.nil?
detect_manager_from_lockfile || fallback_manager
endThis is slightly more concise by using the 2. Constant Visibility
The current approach is fine - this is just a style consideration. 3. Test Duplication The lockfile detection tests are duplicated for both
4. Yarn Detection Edge Case The
However, given that:
The current implementation is pragmatic and acceptable. 📊 Performance Considerations
🔒 Security Assessment
🎯 Overall AssessmentRecommendation: Approve ✅ This PR is production-ready. The implementation is solid, well-tested, and follows all project conventions. The feature provides significant value by improving the default developer experience. The minor observations above are suggestions for potential future improvements, not blockers. Summary:
Great work on this feature! 🎉 |
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🧹 Nitpick comments (5)
.rubocop.yml (1)
199-203: Class-length exclusion is fine; revisit ifPackageJsonkeeps growingExcluding
lib/package_json.rbfromMetrics/ClassLengthmakes sense now that lockfile detection logic has been added, but if this class continues to accumulate behavior it may be worth extracting the detection logic into a dedicated object/module instead of permanently growing the core class.lib/package_json.rb (2)
79-110: Package manager resolution flow looks solid; minor robustness tweak possibleThe new
determine_package_manager/parse_package_manager/detect_manager_from_lockfilepipeline correctly prioritizes: explicitpackageManager→ lockfiles → fallback manager, which matches the documented behavior and tests. One small robustness improvement would be to cap the split inparse_package_managerso odd future formats with extra@s in the version don’t get over-split:- name, version = package_manager.split("@") + name, version = package_manager.split("@", 2)This keeps current behavior identical while being slightly more defensive.
17-20: Yarn lockfile sniffing is defensive and matches test expectationsUsing
LOCKFILE_DETECTION_READ_SIZEto read only a small prefix ofyarn.lockand keying off__metadata:to distinguish Berry vs Classic, while defaulting to:yarn_classicon unreadable/corrupted files or race conditions, gives a good balance between correctness and resilience. If you later need to debug misdetections in the field, consider adding some optional logging/telemetry around the rescue path rather than silently treating every failure as Classic, but the current behavior is consistent and well-covered by specs.Also applies to: 111-130
spec/package_json_spec.rb (1)
410-485: Constructor-path tests mirror.readbehavior; consider DRYing via shared examplesMirroring the entire lockfile detection matrix for
.newensures the constructor path can’t drift from.read, which is great. Since the examples are nearly identical to the.readones, you might eventually factor them into shared examples (e.g.,shared_examples "lockfile detection"used in both contexts) to reduce duplication and keep future changes to the detection rules in one place.sig/package_json.rbs (1)
33-40: Adjustdetermine_yarn_versionRBS type to reflect possiblenilinputIn
lib/package_json.rb#parse_package_manager, theversionpassed todetermine_yarn_versioncan benilwhenpackageManageris just"yarn", anddetermine_yarn_versionexplicitly handles that by raising"a major version must be present for Yarn". The RBS currently declaresdetermine_yarn_version: (String version) -> Symbol, which doesn’t model thenilcase. Consider changing it to something like:def determine_yarn_version: (String? version) -> Symbol(or an explicit
String | nilunion) so static tools more accurately capture the runtime contract.
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🔇 Additional comments (2)
CHANGELOG.md (1)
3-11: Changelog entry accurately describes the new detection behaviorThe new “Added” entry clearly documents the lockfile priority (bun → pnpm → yarn with Berry vs Classic → npm) and the fallback to
PACKAGE_JSON_FALLBACK_MANAGERor npm, matching the implementation and tests.spec/package_json_spec.rb (1)
139-246: Lockfile detection specs for.readare comprehensiveThese examples exercise every relevant scenario (no lockfile → fallback, each supported lockfile type, Yarn Berry vs Classic, unreadable/racy
yarn.lock, and priority conflicts), so the behavior ofdetermine_package_managervia.readis very well pinned down.
Summary
This PR adds automatic package manager detection based on lockfile presence when the
packageManagerproperty is not set inpackage.json. This provides a better default experience by using the package manager that's already in use in the project.Changes
detect_manager_from_lockfilemethod that checks for lockfiles in priority orderdetect_yarn_version_from_lockfilemethod to distinguish between Yarn Berry and Yarn Classic based on lockfile formatbun.lockb- Bunpnpm-lock.yaml- pnpmyarn.lock- Yarn (detects Berry vs Classic from file format)package-lock.json- npmBehavior
When
packageManageris not present inpackage.json:PACKAGE_JSON_FALLBACK_MANAGERenvironment variable ornpmThe
packageManagerproperty inpackage.jsonalways takes precedence over lockfile detection and fallback settings.Test plan
Breaking changes
None - this is backward compatible. The behavior when
packageManageris set or when a fallback is explicitly provided remains unchanged.Fixes #22
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New Features
Documentation
Tests
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