Worked on the DefinitelyTyped/DefinitelyTyped repository to address a critical issue affecting MDX type lookups for downstream TypeScript projects. Focused on package management and type definitions, the developer restored the missing subpath exports map in the package.json file, ensuring that MDX typings could be reliably resolved. This targeted bug fix, delivered through a single commit and merged pull request, improved the stability of type resolution for users integrating MDX with TypeScript. Collaboration was demonstrated through co-authorship and review, emphasizing a careful and precise approach to open source maintenance using JSON and TypeScript within the context of package configuration.