Worked on the DefinitelyTyped/DefinitelyTyped repository to update type definitions for the Picomatch library, focusing on aligning the typings with the v4.x API surface. The approach involved removing deprecated options that were no longer present in the latest version, ensuring that downstream consumers would encounter fewer misconfigurations and runtime or type errors during upgrades. This targeted cleanup was implemented using TypeScript and required careful analysis of the library’s API and adherence to semantic versioning. The work streamlined the upgrade process for projects relying on Picomatch, reduced support overhead, and demonstrated effective library maintenance and pull request collaboration within the TypeScript ecosystem.