In January 2026, Ketao Liu contributed to the DefinitelyTyped/DefinitelyTyped repository by developing a new type definition for beacon broadcasting parameters. He introduced the BeaconObj type and extended the existing AdvertiseReqObj interface, focusing on improving type safety and API clarity for beacon device integrations. Using TypeScript and leveraging his skills in API design and type definitions, Ketao’s work enhanced the typing coverage within the codebase. This update allows downstream tools and users to integrate beacon parameters more safely and reliably. The scope of work was targeted, with no bugs reported, reflecting a focused and well-executed engineering effort during the month.