Top 97 TypeScript Interview Questions & Answers (2026)
About TypeScript
TypeScript is Microsoft's open-source superset of JavaScript that adds static typing, catching errors at compile time rather than runtime. It has become the standard in large-scale frontend and Node.js development, adopted by Microsoft, Slack, Airbnb, and most major companies building substantial codebases. The 2024 State of JS survey shows TypeScript usage has surpassed plain JavaScript in production projects.
What to Expect in a TypeScript Interview
TypeScript interviews test the type system deeply — interfaces vs type aliases, generics, utility types (Partial, Pick, Omit, Record), conditional types, mapped types, and template literal types. Practical questions cover tsconfig options, strict mode, and TypeScript integration with React, Node.js, and build tools.
How to Use This Guide
TypeScript knowledge is tested alongside JavaScript in most interviews. Many questions assume strong JavaScript fundamentals and probe TypeScript-specific additions. Build your JavaScript foundation first, then focus on the TypeScript type system — generics are the most commonly tested advanced topic.
Curated by Tech Baithak Editorial Team · Last updated: May 2026
Core concepts every TypeScript developer must know.
Practical knowledge for developers with hands-on experience.
Deep expertise questions for senior and lead roles.