TypeScript Language

What’s inside

• Foundations — Setup, primitive types and inference, arrays, tuples and objects, and functions with params, returns and overloads
• The Type Language — Unions and narrowing, type aliases vs interfaces, any/unknown/never/void, literal types and as const, and enums
• Types at Work — Classes, two chapters of generics (functions and types, then constraints and utility types), type guards, and discriminated unions
• Mapped & conditional types — plus a full chapter on type-level programming: computing with types, the skill that separates TypeScript users from authors
• In the real world — Modules and tsconfig, async, Promises and typed fetch, the DOM, decorators and class features, and testing
• Tooling & Applied — Strictness flags, declaration files, a tsconfig deep dive, typed data structures, and design patterns in TypeScript
• Every block runnable and trap-annotated — the wrong way shown with the compiler's actual complaint (bad narrowing, phantom types) so you meet it in safety first
• A practice challenge + a harder bonus in every chapter — each with hidden solutions and a dedicated Challenge Answers chapter
• 5 Capstone Projects — TaskTrek, TypeCraft, PollBoard, FormForge, and EventDeck, each with a full Solutions & Explanations chapter