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Overview

TypeScript Basics

All TypeScript Basics

What is TypeScript and why use it?

What is structural typing?

What is the difference between `any`, `unknown`, and `never`?

What is type inference?

What is a union type?

What is an intersection type?

What is type narrowing?

What is a discriminated union?

What is a type assertion?

What does `strict` mode enable?

Interfaces & Object Types

All Interfaces & Object Types

What is the difference between an interface and a type alias?

How do optional properties work?

What are readonly properties?

What is declaration merging?

What is an index signature?

How do you extend an interface?

What are callable interfaces?

What are mapped types?

What are utility types?

How do you model an API response?

Generics

All Generics

What are generics?

How do generic constraints work?

What does `keyof` do?

What does `typeof` do in a type position?

What are conditional types?

What is the `infer` keyword?

How do generic defaults work?

How do you write a generic function?

How do you write a generic React component?

When should you avoid generics?

Functions & Narrowing

All Functions & Narrowing

How do function overloads work?

What is a type predicate?

What is an assertion function?

What is a function return type?

What is the difference between `void` and `never`?

How do you type async functions?

How do you type callbacks?

How do rest parameters work in TypeScript?

How do you type `this` in a function?

What are template literal types?

Project Architecture

All Project Architecture

How do you organize types in a large project?

How do you type environment variables?

How do you validate untrusted runtime data?

How do you migrate JavaScript to TypeScript?

What is `tsconfig.json` for?

What is module resolution?

How do project references work?

How do you share types between frontend and backend?

How do you avoid over-engineered types?

How do you make TypeScript builds faster?

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TypeScript Basics

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TypeScript Basics ​

TypeScript Basics