During December 2024, Lei Yu focused on enhancing the robustness of the Upload component in the element-plus/element-plus repository. He addressed a nuanced edge case in file deletion by refactoring the removeFile logic to identify files by their unique UID rather than relying on direct object comparison. This change ensured correct file removal regardless of v-model usage, eliminating issues with orphaned files and inconsistent deletions. Working primarily with TypeScript and Vue.js, Lei Yu improved both the stability and maintainability of the component. His targeted bug fix demonstrated a thoughtful approach to component development and front-end reliability within a complex codebase.