The TypeScript roadmap

Every TypeScript lesson we teach, laid out as one path. Each station is a stage; tap any lesson to open it. Stations turn teal as you finish them.

Legend:Lesson stageStage completeTap a lesson to open it

Core Type Primitives

Primitive Types

any vs unknown

The never Type

The void Type

Arrays & Tuples

Objects & Interfaces

Enums vs Const Objects

Nullish Values & !

Literal Types

Type Operators & Flow Analysis

Union Types

Intersection Types

The typeof Operator

The keyof Operator

Control Flow & Type Guards

Type Predicates (is)

Assertion Functions (asserts)

Discriminated Unions

Functions & Callables

Typing Functions

Function Overloads

Typing Promises & Async

Function Variance

The this Parameter

Generics

Basic Generics

Generic Constraints

Multiple Generics & Defaults

Const Type Parameters

Advanced Type Manipulation

Indexed Access Types

Conditional Types

The infer Keyword

Mapped Types

Key Remapping (as)

Template Literal Types

Intrinsic String Types

Recursive Types

Utility Types & Modifiers

as const & readonly

Partial & Required

The Record Type

Pick & Omit

Exclude & Extract

Parameters & ReturnType

The Awaited Type

Object-Oriented & Metadata

Classes & Visibility

Parameter Properties

Abstract Classes & Methods

Modern Decorators

Architecture & Config

Modules vs Namespaces

tsconfig Compiler Flags

Module Resolution

Declaration Files (.d.ts)

React & DOM Ecosystem

Typing the DOM

React Component Typing

React Hooks Typing

React Event Handlers

The satisfies Operator