PR9: Enhanced Layer Support

[ScriptedAlchemy]

Summary

• Add comprehensive unit tests for issuerLayer fallback logic for PR9
• Complete implementation of Enhanced Layer Support as per the revised incremental PR plan

Changes Made

Test Coverage Added

• issuerLayer fallback behavior verification: Tests demonstrate the fallback pattern that tries issuerLayer first, then falls back to undefined
• createLookupKeyForSharing utility tests: Verify the utility function that creates lookup keys like (client)react for layered requests
• Mocking improvements: Added proper mocks for resolveMatchedConfigs to support test environment

Implementation Details

The core functionality for PR9 was already implemented in the codebase:

✅ Already Implemented Components:

1. ConsumeSharedModule.ts - Layer parameter support (lines 72-74)
2. ConsumeSharedFallbackDependency.ts - Layer support (lines 16-25)
3. resolveMatchedConfigs.ts - issuerLayer priority logic (line 34: const layer = config.issuerLayer;)
4. utils.ts - createLookupKeyForSharing function (lines 533-541)
5. ConsumeSharedPlugin.ts - issuerLayer fallback logic pattern:

   unresolvedConsumes.get(createLookupKeyForSharing(request, contextInfo.issuerLayer)) ||
   unresolvedConsumes.get(createLookupKeyForSharing(request, undefined))

✅ New Test Coverage:

• Tests verify the fallback pattern works correctly
• Tests verify createLookupKeyForSharing('react', 'client') returns '(client)react'
• Tests verify edge cases with undefined, null, and empty string layer values
• All 119 sharing tests now pass

Test Results

✓ 119 sharing tests passed
✓ issuerLayer fallback logic tests added and passing
✓ createLookupKeyForSharing utility tests passing

This completes PR9: Enhanced Layer Support as defined in the revised incremental PR plan. The implementation provides robust layer support with proper fallback mechanisms for shared module resolution.

🤖 Generated with Claude Code

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