Worked on the axios/axios repository to enhance the reliability of HTTP requests by improving error handling within the XHR adapter. Focused on JavaScript front end development, the work addressed a bug where cancelToken and signal listeners were not properly unsubscribed during error, timeout, or abort scenarios, which could lead to memory leaks. The solution involved updating the error handling logic to ensure thorough cleanup of listeners, and adding regression tests to verify these changes and prevent future regressions. This approach strengthened the codebase’s stability, improved test coverage, and reduced the risk of resource leaks in error-prone network operations.