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🟦TypeScript

JavaScript with a static type system. Catch bugs before they ship and build APIs your editor can autocomplete.

📘Theory & Lessons 💻Code Examples 🔗TypeScript Handbook

4 Phases · 16Topics · Basic → Advanced

Phase 1

TypeScript Basics

4 topics

🟦

Introduction to TypeScript

Why types? Setup with tsc / Vite / Next.js, tsconfig essentials, and your first .ts file.

🔤

Primitive & Built-in Types

string, number, boolean, null, undefined, any vs unknown vs never, type inference and literal types.

📊

Arrays, Tuples & Enums

T[] vs Array<T>, readonly arrays, fixed-length tuples with labels, numeric vs string enums (and union alternatives).

⚙️

Functions & Overloads

Parameter & return types, optional/default/rest params, function types, void vs undefined, overload signatures.

Phase 2

Objects, Interfaces & Unions

4 topics

🧱

Interfaces & Type Aliases

interface vs type, optional/readonly properties, extends, intersection &, declaration merging.

🔀

Union & Intersection Types

string | number, discriminated unions, exhaustiveness checks with never, intersection &.

🎯

Type Narrowing & Guards

typeof, instanceof, in, equality narrowing, custom type predicates (`x is T`), assertion functions.

📌

Literal Types & as const

string/number literal types, `as const`, template literal types, narrowing with literal unions.

Phase 3

Generics, Classes & Modules

4 topics

🧬

Generics

Generic functions, classes, interfaces; constraints (extends), default type params, generic helpers.

🏛️

Classes in TS

public/private/protected, readonly, parameter properties, abstract classes, implements vs extends.

📦

Modules & Declarations

import/export with types, .d.ts files, ambient modules, triple-slash references, working with @types/* packages.

🛠️

Utility Types

Partial, Required, Pick, Omit, Record, ReturnType, Parameters, Awaited, NonNullable.

Phase 4

Advanced TS & Practice

4 topics

🧠

Mapped & Conditional Types

{ [K in keyof T]: … }, conditional `T extends U ? X : Y`, infer, distributive conditionals.

⚛️

TypeScript with React

Typing props, useState/useReducer/useRef, event handlers, children, generic components, FC vs explicit return.

⚙️

tsconfig & Project Setup

strict, noImplicitAny, paths, moduleResolution, target/lib, project references, ESLint + ts-eslint.

🏆

Practice & Projects

Type-Challenges roadmap, refactor a JS project to TS, build a typed REST client, learn from DefinitelyTyped.