TypeScript

TypeScript adds static types to JavaScript. You write types, the compiler catches mistakes, your editor gives better autocomplete. Any valid JavaScript is valid TypeScript - you can adopt it incrementally.

Overview

• Language: Superset of JavaScript with static type annotations
• Runtime: Compiles to JavaScript (runs anywhere JS runs)
• Install: npm install -D typescript (project) or use a bundler like Vite that handles it
• Config: tsconfig.json controls compiler behavior
• Ecosystem: All JavaScript libraries work; most have type definitions via @types/*

Contents

• Concepts - Type system fundamentals
  • Type System - Inference, annotations, structural typing
  • Types vs Interfaces - When to use which
  • Generics - Reusable, type-safe code
• Quickstart - Get started
  • Setup - Project setup with modern tooling
• Deep Dives - Advanced patterns
  • Utility Types - Partial, Pick, Omit, and friends
• Notes - Tips and gotchas

Resources

• TypeScript Handbook
• TypeScript Playground
• DefinitelyTyped