TypeScript Explained: Why Every JavaScript Developer Should Care You've been writing JavaScript for years. It works. So why bother with TypeScript? That's what I thought too — until I spent two days debugging a production bug that turned out to be a simple typo in a property name. A bug TypeScript would have caught in milliseconds. In this post, I'll explain what TypeScript is, why it exists, and how to write your very first TypeScript program. No fluff — just what you actually need ...