Worked on improving the reliability of file access simulation in the microsoft/lage repository, focusing on aligning simulated behavior with actual file system operations. Addressed a correctness issue by replacing asynchronous methods with Node.js synchronous APIs, specifically readSync and readdirSync, to ensure that file contents are properly read and directories accurately enumerated during simulation. Updated the associated tests in JavaScript and TypeScript to reflect these changes, enhancing test coverage and reliability. This work reduced the risk of production issues and improved developer confidence in local and CI environments, demonstrating practical skills in CLI development, file system operations, and testing workflows.