Fully qualify more types in source generated code to avoid namespace clashes

[thomhurst]

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[claude]

Claude finished @thomhurst's task —— View job

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PR Review: Fully qualify more types in source generated code

This PR addresses namespace clashes by globally qualifying type references throughout the source generator. Here's my comprehensive review:

✅ Code Quality & Best Practices

Excellent approach: The consistent use of global:: prefixes prevents namespace clashes effectively. The pattern is systematically applied across:

• System types (global::System.Reflection.BindingFlags instead of System.Reflection.BindingFlags)
• Collection types (global::System.Collections.Generic.IAsyncEnumerable instead of IAsyncEnumerable)
• Exception types (global::System.InvalidOperationException instead of System.InvalidOperationException)

Clean implementation: The GloballyQualified() extension method in TypeExtensions.cs:209 provides a centralized approach for type qualification, using proper Roslyn SymbolDisplayFormat configurations.

✅ Potential Issues - None Critical

No significant bugs found. The changes are mechanical and safe:

• All qualified types maintain their original semantics
• Generated code remains functionally identical
• Only namespace qualification changes, not logic

Edge case consideration: The special handling for generic type parameters (TypeKind.TypeParameter) in GloballyQualified() is correctly implemented, avoiding qualification of type parameters like T or TKey.

✅ Performance Considerations

Minimal impact:

• Generated code size increases slightly due to longer type names
• Compilation might be marginally faster due to fewer namespace resolution steps
• Runtime performance unchanged - the global:: prefix is compile-time only

AOT-friendly: The fully qualified names improve compatibility with AOT scenarios by removing ambiguity.

✅ Security Concerns

No security issues: These are syntactic changes to generated code that don't introduce vulnerabilities. The qualification actually improves security by preventing potential type confusion attacks.

✅ Test Coverage Impact

Comprehensive test coverage:

• 55 verified test files updated consistently
• Tests cover complex scenarios including generic methods, data sources, and inheritance
• The mechanical nature of changes reduces risk of test gaps

Pattern validation: The verified test files show consistent application across different code generation scenarios (metadata, hooks, AOT optimization).

📋 Summary

This is a high-quality, low-risk change that significantly improves the robustness of the source generator by preventing namespace clashes. The implementation is:

• ✅ Systematically applied across all generated code
• ✅ Uses proper Roslyn APIs for type qualification
• ✅ Maintains backward compatibility
• ✅ Follows established C# conventions for global qualification
• ✅ Well-tested through comprehensive verified test updates

Recommendation: ✅ Approve - This change enhances the reliability of the source generator without introducing risks.

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• Read repository guidelines (CLAUDE.md)
• Analyze source generator changes
• Review verified test file changes
• Check for potential bugs or issues
• Evaluate performance considerations
• Assess security concerns
• Review test coverage impact
• Provide comprehensive feedback