Sometimes you get interviewed by arseholes so expect the worst questions like: How do you use decorators in TypeScript? Or How do you apply the SOLID principles in JavaScript? Answer from YurrBoiSwayZ on reddit.com
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Arc
arc.dev › home › 20 typescript interview questions and answers you should prepare for
20 TypeScript Interview Questions and Answers You Should Prepare For
November 24, 2025 - This is a fundamental question ... they are with its features. Make sure your candidate can describe TypeScript as a language, its core features, and how it relates to JavaScript....
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GeeksforGeeks
geeksforgeeks.org › typescript › typescript-interview-questions
50+ TypeScript Interview Questions and Answers (2025) - GeeksforGeeks
July 23, 2025 - The null type represents the intentional absence of a value. It is commonly used to indicate that a variable or object currently has no value. In TypeScript, null is typically used with union types (e.g., string | null).
Discussions

Have a TS interview in a few days, help needed
Just ignorance on my side: why take an interview in a language you don't know? If it's a junior position, they don't expect all right answers. If not, you're underqualified. More on reddit.com
🌐 r/typescript
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April 7, 2024
What Javascript, React or Typescript questions would you expect a developer to know based on their experience?
Sometimes you get interviewed by arseholes so expect the worst questions like: How do you use decorators in TypeScript? Or How do you apply the SOLID principles in JavaScript? More on reddit.com
🌐 r/webdev
114
245
June 22, 2023
How should I prepare for a TypeScript/React front-end interview in a week? It's my dream job!
I would argue that OOP has no place in modern React, so I wouldn't worry about it. My current job just asked me to build an app where I hit an API, displayed a list of data, and had some controls which made new calls to the API to filter the data. If you can do that much, you're probably ready to interview. Maybe just do some problem solving. One of my favorite tricky questions to ask JS devs is: build a memoize function for functions which take 1 string | number argument. More on reddit.com
🌐 r/typescript
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November 11, 2021
Technical Interview Prep
They are more likely going to ask you JavaScript/general web dev questions instead. There are very few things in TypeScript not already in JavaScript that's important enough to warrant asking at an interview. And even if asked, unlikely going to cost you your interview. They might ask you to interpret some TypeScript code and guess where it might have an error, or ask about some best practice (eslint rule, enum/namespace pattern) and pro/con behind it. More on reddit.com
🌐 r/typescript
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March 18, 2022
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Medium
medium.com › @rupalsinghal › typescript-interview-questions-that-never-leave-you-alone-a5a6769a8221
TypeScript Interview Questions That Never Leave You Alone | by Rupal Singhal (Full-Stack Developer) | Medium
January 27, 2026 - This article walks through the most repeatedly asked TypeScript interview questions, with explanations that help you answer confidently, not mechanically.
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Reddit
reddit.com › r/typescript › have a ts interview in a few days, help needed
r/typescript on Reddit: Have a TS interview in a few days, help needed
April 7, 2024 -

Hey, I am new to TS and I’m supposed to take an interview in it. They said that the focus is going to be backend. So don’t need to include react in it.

I’m trying to work my way through to prepare for it.

I’m able to build a basic CRUD app using TypeORM.

I’m an entry level grad student and I wish to how to prepare for it.

Thanks

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GreatFrontEnd
greatfrontend.com › blog › typescript-interview-questions-for-senior-frontend-developers
TypeScript Interview Questions for Senior Developers (2026) | Blog
June 3, 2026 - A practical set of TypeScript interview questions for senior frontend developer interviews, with coding problems on generics, unions, utility types, and React TypeScript.
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GitHub
github.com › Devinterview-io › typescript-interview-questions
GitHub - Devinterview-io/typescript-interview-questions: 🟣 Typescript interview questions and answers to help you prepare for your next technical interview in 2026.
Newer JavaScript Features: TypeScript extends JavaScript syntax, providing support for the latest ECMAScript standards more effectively through its compiler, even when the underlying JavaScript engine might not support them yet.
Author   Devinterview-io
Find elsewhere
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DataCamp
datacamp.com › blog › typescript-interview-questions
Top 40 TypeScript Interview Questions and Answers for 2026 | DataCamp
November 20, 2025 - In this section, we will explore TypeScript interview questions related to functions and objects.
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Reddit
reddit.com › r/webdev › what javascript, react or typescript questions would you expect a developer to know based on their experience?
r/webdev on Reddit: What Javascript, React or Typescript questions would you expect a developer to know based on their experience?
June 22, 2023 -

After I landed my first role, I made moves to other companies via recommendations or being poached so I haven't had a proper technical interview since I was a Junior Dev. Nearly 4 years later, I'm wondering what interview questions I should be able to answer - just in case there's something I haven't yet learned or I need to brush up on.

I've left the question open as well so other devs of varying experiences can also have an answer, so feel free to give different ranges as well if you feel so inclined.

Thanks!

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InterviewBit
interviewbit.com › typescript-interview-questions
Top TypeScript Interview Questions (2025) - InterviewBit
We have provided simple code examples to cement the concepts further. Finally, you can use the multiple-choice questions at the end of the article to test your understanding of the various topics in TypeScript. ... TypeScript is the superset of the following programming language.
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Reddit
reddit.com › r/typescript › how should i prepare for a typescript/react front-end interview in a week? it's my dream job!
r/typescript on Reddit: How should I prepare for a TypeScript/React front-end interview in a week? It's my dream job!
November 11, 2021 -

Self taught and reasonably familiar with JS/React. I have written TypeScript, but I feel like I lack a systematic understanding of TS. If I had a week to ace this interview, what are my best course of action here?

I have tried a few easy questions of exercism, typescript-exercises.github.io, but my progress is painfully slow and I am afraid I wouldn't get much done in time.

I also wonder how much time I should be devoted to learning OOP with TS. I don't have much experience with OOP in JS.

According to my sources, my dream company tests more practical problems, e.g. implementing a design. No whiteboarding.

Any help deeply appreciated! Feel free to share your go to TS and or react interview questions!

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I would argue that OOP has no place in modern React, so I wouldn't worry about it. My current job just asked me to build an app where I hit an API, displayed a list of data, and had some controls which made new calls to the API to filter the data. If you can do that much, you're probably ready to interview. Maybe just do some problem solving. One of my favorite tricky questions to ask JS devs is: build a memoize function for functions which take 1 string | number argument.
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I would be surprised if there’s something specific they will ask about TypeScript if they are focused on practical problems. Most interviews I’ve seen and held focused on solutions, rather than knowledge of specific language nuances. If it was in TS so be it, if it was in plain JS that’s fine. The solution will reveal how well do you know the language you use. If you are not familiar with OOP, I’d at least brush up a bit on OOP aspects in JS. For example, prototypal inheritance. It doesn’t come up often, in my experience, but sometimes even awareness of some concepts is enough. Most of the modern react code focuses more on functional programming, so understanding things like scope, inline functions, asynchronous execution (and if you want to impress how event loop works), and for react - state, context and component lifecycle should get you through most interviews. In practical terms, find a few problems like building small aspects of an application - a login/registration form, a multi-step wizard that collects data over multiple views, a basic checkers or chess game. You should be able to output something to the screen, interact with it and change something based on that interaction. I’ve rarely seen someone asking to use APIs (unfortunately), however making a simple post or a get request would be good to know how to do. What level are you interviewing for?
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Edureka
edureka.co › blog › interview-questions › typescript-interview-questions
Top 50 TypeScript Interview Questions and Answers in 2025
February 12, 2025 - This TypeScript interview questions blog will provide you in-depth knowledge about TypeScript and prepare you for the interviews in 2024.
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Medium
nabendu82.medium.com › typescript-interview-questions-80d4bb1e9733
TypeScript Interview Questions. Nowadays most modern ReactJS and NodeJS… | by Nabendu Biswas | Medium
April 14, 2024 - TypeScript is a superset of JavaScript in which you add types to JavaScript. JavaScript is a loosely typed language which leads to lot of types error in production code. With TypeScript developers can catch those error, even before running the code. Question 2 — What is explicit and implicit type assignment?
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DEV Community
dev.to › m_midas › 30-frontend-interview-questions-typescript-12c2
30 Frontend Interview Questions - TypeScript - DEV Community
October 2, 2024 - Mastering it includes not just basic syntax but deeper concepts like types, interfaces, generics, and how TypeScript interacts with JavaScript libraries. Below is a curated list of 30 interview questions targeting a frontend developer role with a focus on TypeScript.
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Mimo
mimo.org › blog › typescript-interview-questions
Top TypeScript Interview Questions - Mimo
May 28, 2026 - Prepare for TypeScript interviews with practical questions on typing, interfaces, generics, unions, utility types, React, and Node.js.
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Techprep
techprep.app › blog › typescript-interview-questions
31 Most Common TypeScript Interview Questions and Answers (2026) | TechPrep
TypeScript is a statically-typed programming language developed by Microsoft. It extends JavaScript by adding a type system, allowing developers to specify data types for variables, function parameters, and return values.
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Simplilearn
simplilearn.com › home › resources › software development › top 50 typescript interview questions with answers for 2026
50 TypeScript Interview Questions and Answers for 2026
June 22, 2026 - Top TypeScript Interview Questions and Answers: 1. What is TypeScript? 2. Explain Arrays in TypeScript 3. List the Applications of TypeScript
Address   5851 Legacy Circle, 6th Floor, Plano, TX 75024 United States
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Adaface
adaface.com › home › adaface | free interview questions & answers › 98 typescript interview questions - adaface
98 TypeScript interview questions - Adaface
September 9, 2024 - This blog post is structured to provide a comprehensive list of TypeScript interview questions categorized by difficulty: basic, intermediate, advanced, and expert, plus a set of multiple-choice questions.
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Upgrad
upgrad.com › home › blog › software development › 52+ top typescript interview questions and answers for all skill levels in 2025
52+ Top TypeScript Interview Questions and Answers for 2025
February 24, 2025 - The core TypeScript interview questions will focus on aspects like data types, syntax, functions, and essential concepts like getters and setters.
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DevGenius
blog.devgenius.io › typescript-5-essential-interview-questions-6f680c177e9a
TypeScript: Five Common Interview Questions | by Patrick Karsh | Dev Genius
February 26, 2024 - As more companies adopt TypeScript for their projects, understanding its nuances and features is crucial for developers looking to excel in this environment. Below, we explore five critical TypeScript interview questions, complete with code examples, to help you prepare for your next job interview.