Contributed to the roc-lang/roc repository by enhancing the code formatter to better handle unit types within function type arguments, ensuring type clarity and consistency throughout the codebase. Focused on refining the type system design, the work involved updating the formatting logic so that unit types are preserved rather than inadvertently removed. This change required careful adjustment of snapshot tests to accurately reflect the new formatting behavior, thereby improving regression safety and test reliability. Leveraging skills in Zig, code formatting, and unit testing, the developer delivered a targeted feature that strengthened the robustness and maintainability of the project’s type system.