Worked on backend development and testing for the apify/apify-shared-js repository, focusing on improving configuration reliability for Claude Code integrations. Addressed a specific bug by implementing a case-insensitive check that forbids the use of 'CLAUDE.md' and 'claude.MD' as usernames, mirroring an established pattern from previous pull requests to ensure consistency across the codebase. Developed dedicated unit tests in TypeScript to verify that these usernames are correctly rejected, thereby reducing the risk of configuration conflicts and support issues. This targeted update enhanced the robustness of username validation logic and contributed to more predictable workflows for downstream integrations.