John Rinehart developed a configuration enhancement for the YaLTeR/niri repository, introducing support for optional includes with validation and user-friendly warnings. Using Rust, he implemented logic that allows configuration files to reference optional external files without causing errors if those files are missing, instead emitting clear warnings to aid troubleshooting. His approach included strict validation of the include directive, rejecting unknown properties and unexpected arguments to prevent misconfigurations. John also updated documentation to clarify the new behavior and collaborated across teams to ensure maintainability. This work improved configuration flexibility, error handling, and overall user experience within the project’s codebase.