Worked on enhancing argument parsing in the denoland/std repository by improving the parseArgs function to accept readonly string arrays, thereby increasing type safety and robustness for CLI development workflows. The technical approach involved updating the TypeScript implementation to handle the new input type and adding comprehensive tests to verify compatibility with existing command-line flows. This change reduces the risk of runtime type errors and strengthens the foundation for downstream tooling. Collaboration was demonstrated through co-authorship, with a focus on code quality and maintainability. The work leveraged TypeScript and CLI development skills to deliver a targeted, reliable feature within one month.