During December 2025, Nick McDougall refactored the shell detection logic in the fastapi/typer repository, replacing the external shellingham dependency with an internally managed solution. This work focused on improving maintainability by reducing reliance on third-party packages, thereby lowering the risk of upstream changes affecting the project. Nick implemented the new logic using Python, emphasizing robust dependency management and comprehensive testing to ensure reliability. By consolidating this feature, he simplified the continuous integration process and made future enhancements more straightforward. The changes also support faster onboarding for new contributors, reflecting a thoughtful approach to long-term project sustainability and code quality.