Contributed to the DefinitelyTyped repository by enhancing the Tampermonkey type definitions, specifically adding abort capability to GM.xmlHttpRequest. This work introduced a new PromiseWithAbort type and updated the API signature to support abort semantics, allowing developers to cancel long-running or unnecessary HTTP requests for improved script reliability. The implementation included automated tests to verify correct abort behavior and ensure type safety across various scenarios. The feature was developed using TypeScript with a focus on API development and type definitions, reflecting a precise approach to extending third-party typings and maintaining robust, well-tested interfaces for the JavaScript developer community.