TypeScript

TypeScript is a strongly typed superset of JavaScript developed by Microsoft. It adds static type checking to JavaScript, catching errors at compile time rather than runtime. TypeScript compiles to plain JavaScript, so it runs everywhere JavaScript runs: browsers, Node.js, and serverless environments.

The type system is sophisticated enough to model complex data structures, generic functions, and conditional types, while remaining practical for everyday development. TypeScript's type inference means you get safety benefits without annotating every variable. The language server provides excellent IDE support with autocomplete, inline documentation, and real-time error detection.

TypeScript has become the industry standard for serious JavaScript development. The majority of popular frameworks and libraries now ship with TypeScript definitions, and many are written in TypeScript natively.

I write everything in TypeScript because AI systems handle complex data structures that change as requirements evolve. When a Claude AI response shape changes, when a Supabase schema is updated, or when a new field is added to an API, TypeScript catches every place in the codebase that needs to adapt. Without types, these changes silently break at runtime.

For client projects, TypeScript is an investment in long-term maintainability. The type definitions serve as living documentation that stays in sync with the code. A developer joining the project months later can understand the data flow by reading the types, without deciphering runtime behavior.