TypeScript Interview: 200 Questions and Answers

The book "TypeScript Interview: 200 Questions and Answers" is a practical guide for developers who want to confidently pass a technical interview and deepen their TypeScript knowledge. The material is structured from simple to complex, covering all key topics of the language.

What is this book about?

You will find 200 carefully selected questions divided into thematic blocks:

• TypeScript Basics: type system, interfaces, union and intersection types, literal types.
• Advanced Types: conditional types, mapped types, infer, utility types (Partial, Required, Pick, Omit, etc.).
• Generics: generic functions, classes, constraints, variance.
• Decorators and Metaprogramming: class, method, property decorators, their use in Angular and NestJS.
• Modules and Namespaces: ES modules, path resolution, ambient declarations.
• TypeScript Configuration: tsconfig.json, strict modes, compiler options.
• Integration with JavaScript: typing existing JS code, .d.ts files, declare.
• Real-world Scenarios: logic questions, architectural decisions, compilation errors.

Who is this book for?

• Junior developers: who are just starting to learn TypeScript and want to systematize their knowledge.
• Middle developers: preparing for a promotion or job change.
• Team leads and architects: wanting to test their team or create quality interview questions.

What will you learn?

• How to properly use strict types and avoid any.
• The difference between interface, type, and abstract class — when to use which.
• How conditional types and recursive patterns work.
• Typical mistakes in interviews and how to avoid them.
• How to configure the compiler for maximum code safety.

Each question comes with a detailed answer including code examples and explanations. The book is suitable both for self-study and for use as a cheat sheet before an interview.

Take your next career step — master TypeScript at a professional level!