Mastering TypeScript's Advanced Types: Beyond `string` and `number`

Mastering TypeScript's Advanced Types: Beyond string and number TypeScript has taken the web development world by storm, and for good reason. It brings static typing to JavaScript, catching errors early and making our code more predictable. Most developers start with the basics: string , number , boolean , and maybe Array<string> . But TypeScript's true power lies in its advanced type system —a feature that can transform how you structure and reason about your code. In this guide, we'll move beyond primitive types and explore practical applications of TypeScript's most powerful type features. You'll learn how to create self-documenting, resilient code that catches bugs at compile time rather than runtime. Why Advanced Types Matter Before we dive into the syntax, let's address the "why." Advanced types help you: Encode business logic into your types (making invalid states unrepresentable) Create self-documenting APIs that are clear to consumers Reduce runtime type checking with compile-