Some folks argue that TypeScript is obsolete now that AI can write code for us. We disagree, hard.
The type system is what makes the AI useful. When Copilot writes a function, the type signature is the contract. If types are loose, the AI confidently writes broken code. If types are sharp, the AI writes code that compiles AND works.
Three reasons TypeScript wins in 2026
1. It pairs better with AI. Better completions, fewer hallucinations, less drift.
2. It documents intent. A type is the cheapest, most accurate documentation that always stays in sync.
3. It scales teams. Refactoring a JS codebase across 5 engineers is terrifying. Refactoring a TS one is just work.
Our rules at Noirgate
• `strict: true` everywhere. No exceptions.
• No `any` in checked-in code. If we need an escape hatch, we use `unknown` and narrow.
• Public APIs are typed first, implemented second.
• ESLint stops the build on type errors in CI.
These rules look strict on paper. In practice they make the codebase pleasant to work in for years.
