The world of programming is always changing. New tools, new ways of doing things. Sometimes, big projects make huge changes to their own code to keep up. One such massive change happened deep within the TypeScript project itself. It was a move that affected how the language's own code was organized.

This wasn't a small tweak. It was a fundamental shift in how the TypeScript compiler and its related tools were built. The goal was to make the codebase cleaner and more modern. It's a story about how even the creators of a language have to adapt and improve their own tools.