TypeScript has become a must-know skill for modern developers, thanks to its ability to bring type safety and scalability to JavaScript projects. If you’re preparing for a frontend or full-stack interview, here are some of the most common TypeScript questions to review.

1. What is TypeScript?
TypeScript is a superset of JavaScript developed by Microsoft that adds static typing and object-oriented features to JavaScript. It compiles down to plain JavaScript, making it compatible with any JS environment.

2. What are Interfaces in TypeScript?
Interfaces define the structure of an object. They help enforce type consistency and improve code readability.

interface Person { name: string; age: number; }

3. What are Generics?
Generics allow you to create reusable components that work with any data type.

function identity<T>(arg: T): T { return arg; }

4. Difference between any and unknown?
any disables type checking, while unknown requires type verification before use—making it safer.

5. What are TypeScript’s main advantages?
Type safety, better tooling (like IntelliSense), early error detection, and easier code maintenance.

Mastering these fundamentals helps you stand out in TypeScript-based roles.