> I've actually never seen a proper codebase in Typescript.
That's the problem then. I have, and have clearly seen in the real world why it's superior. ES6/Coffeescript can obviously be done correctly, but chaos tends to ensue as the flexibility is abused. Over time it makes debugging/understanding difficult. TypeScript makes changing/navigating large codebases a breeze. In other words, it's much easier to do correctly than ES6/Coffeescript.
That's the problem then. I have, and have clearly seen in the real world why it's superior. ES6/Coffeescript can obviously be done correctly, but chaos tends to ensue as the flexibility is abused. Over time it makes debugging/understanding difficult. TypeScript makes changing/navigating large codebases a breeze. In other words, it's much easier to do correctly than ES6/Coffeescript.