During February 2026, Mouad contributed to the DefinitelyTyped/DefinitelyTyped repository by delivering TypeScript type definitions and modularization for the d3-tile library. He refactored the library to use standalone exports rather than augmenting the main d3 module, which improved modularity and allowed for independent usability. Mouad implemented comprehensive tests to validate tile layout functionality, ensuring type safety and reliability. His work leveraged TypeScript, D3.js, and module design principles to reduce coupling within the d3 ecosystem. This approach enabled easier integration for downstream projects and supported future maintenance, demonstrating a focused and well-structured engineering effort within a short timeframe.