TypeScript, a typed superset of JavaScript developed by Anders Hejlsberg in 2012, was originally designed to address the scalability issues of JavaScript in large, multi-developer projects. By 2025, it surpassed both JavaScript and Python to become the most-used language on GitHub, reflecting its success in providing a framework for safer, maintainable, and collaborative coding environments. TypeScript's integration of static type checking, interfaces, and modern language features—while maintaining compatibility with JavaScript—has made it indispensable for both human developers and AI-assisted coding. The language's evolution is marked by a transition from being self-hosted to using Go for performance improvements, while retaining functional consistency, which has bolstered developer trust. As AI increasingly influences development practices, TypeScript's robust type system and its capacity to facilitate reliable AI workflows have further cemented its relevance. The language's growth is a testament to its foundational design, aimed at simplifying complex software development and fostering clear expression of developer intent.