Contributed to the DefinitelyTyped/DefinitelyTyped repository by delivering a feature that extends BigSource with support for the bigint data type, enabling more robust handling of large integers. The work involved updating TypeScript type definitions and augmenting test suites to ensure comprehensive coverage and compatibility with the new functionality. This addition improved type safety and provided a smoother upgrade path for users adopting version 7.0.1. The development process demonstrated proficiency in library development, type definition management, and collaborative pull request integration. No bugs were addressed during this period, with the primary focus on enhancing data handling and maintaining rigorous testing standards.