TypeScript

JavaScript with superpowers.

Add static types to JavaScript to catch bugs early and supercharge your editor — types, interfaces, generics, and more.

Start course0 of 7 lessons complete

Chapter 1

TypeScript Basics

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01Beginner

What is TypeScript?

Discover how TypeScript adds a safety net of types on top of JavaScript, catching bugs before your code ever runs.

02Beginner

Basic Types

Learn how to label your variables with TypeScript's core types — string, number, boolean, and arrays — and discover how TypeScript can often figure out the type for you.

03Beginner

Typing Functions

Learn how to annotate function parameters and return types in TypeScript so your functions become self-documenting and error-proof by design.

Chapter 2

Structuring Types

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04Intermediate

Interfaces & Type Aliases

Learn how to describe the exact shape of your objects using TypeScript's interface and type alias — two of the most useful tools in the whole language.

05Intermediate

Unions & Narrowing

Learn how to express "one of several types" with union types, and how TypeScript's narrowing guards let you work safely with each possibility.

Chapter 3

Advanced TypeScript

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06Advanced

Generics

Learn how to write flexible, reusable functions and containers that stay fully type-safe by using type parameters — the angle-bracket superpower of TypeScript.

07Intermediate

TypeScript with React

Learn how TypeScript supercharges your React components by typing props, state, event handlers, and children — catching bugs before they ever hit the browser.