TypeScript

Overview

TypeScript is JavaScript with static typing. It adds a compile-time type checker; runtime behavior is JavaScript. Learning JavaScript applies to TypeScript for runtime tasks (e.g. sorting a list, DOM, async). Use TypeScript for types, interfaces, generics, and better tooling.

Core idea: Types describe shape and contracts; the compiler catches type errors before run time. Enable strict in tsconfig.json as a best practice.

Quick reference