Worked on the tscircuit/circuit-json repository to enhance type safety and maintainability by refactoring the PcbTraceRoutePointVia component. The approach involved replacing plain string usage for from_layer and to_layer with the LayerRef type, aligning this structure with the existing wire variant and reducing the need for unsafe type assertions in downstream code. This change improved code consistency and prepared the codebase for broader LayerRef adoption. The work focused on delivering business value through code quality improvements rather than bug fixes, utilizing TypeScript and emphasizing strong type safety and software development best practices throughout the implementation process.