During August 2025, Leng Yingxin focused on improving the reliability of React hooks in the ant-design/x repository. Addressing a crash scenario in the useActive hook, Leng implemented defensive programming techniques in TypeScript and JavaScript to guard against empty or invalid items arrays during initialization of active paths. This fix reduced the risk of runtime errors for end users and enhanced the stability of the component. Leng also introduced regression tests to verify correct behavior in edge cases, supporting future resilience. The work demonstrated a strong grasp of React, testing methodologies, and robust code practices, contributing to a smoother user experience.