Worked on the CesiumGS/cesium repository to enhance input handling reliability and maintain code quality within the front-end codebase. Addressed a bug in the ScreenSpaceEventHandler by standardizing button state tracking, shifting from named mouse button constants to numerical indices to ensure accurate identification of left, middle, and right mouse buttons across various interaction types. Applied consistent usage of internal variables to improve maintainability and predictability in user interactions. Additionally, contributed to project documentation by updating the CONTRIBUTORS.md file to recognize team efforts. Utilized JavaScript and Markdown, focusing on event handling and documentation to support both user experience and developer collaboration.