TypeScript Interview: 200 Questions and Answers

The book "TypeScript Interview: 200 Questions and Answers" is a practical guide for developers preparing for a technical interview. Unlike dry reference manuals, the material is structured in a "question-answer" format, allowing you to quickly review key topics and understand which aspects of the language employers most often test.

The book covers all stages: from basic typing to complex concepts like conditional types and mapped types. Each answer contains not only the correct solution but also an explanation of why it works that way, as well as common candidate mistakes.

Who this book is for

• Junior developers who want to systematize their knowledge and pass their first interview
• Middle developers looking to delve deeper into advanced TypeScript features
• Anyone transitioning from JavaScript to TypeScript who wants to confidently answer interviewers' questions

What you will learn

• How to correctly use types, interfaces, and their differences
• All the nuances of generics: from simple parameters to conditional and recursive types
• Working with decorators, modules, and namespaces
• Configuring tsconfig and organizing types in large projects
• Typical interview tasks: type guards, discriminated unions, utility types
• Tips on interview behavior and common pitfalls

The book is designed so that it can be read sequentially or used as a cheat sheet — open the desired topic and immediately get an answer with an analysis. Each question is accompanied by code that can be run and tested.

The author is Alexey Gromov, a senior frontend developer with 8 years of experience, a participant in technical interviews at major IT companies. All questions are gathered from real interviews and supplemented with comments from practice.

If you want to pass a TypeScript interview on the first try or simply fill gaps in your knowledge, this book will become your reliable assistant.