Worked on the webpack/webpack repository to enhance the command-line interface by implementing robust number validation supporting both decimal and scientific notation inputs. Leveraging JavaScript and regular expressions, the solution addressed edge-case errors in CLI input parsing, reducing the risk of invalid number formats affecting production workflows. Regression tests were added to ensure ongoing reliability and to guard against future parsing regressions, reflecting a strong focus on testing best practices. The work improved the stability and trustworthiness of the CLI for developers and downstream tooling, while also aligning documentation and commit practices with project standards to support maintainability and collaboration.