TypeScript Interview Questions & Assessment
Evaluate TypeScript skills including type system mastery, generics, utility types, type guards, and integration with popular frameworks.
Why TypeScript Matters
TypeScript has become the industry standard for large-scale JavaScript applications. Most new projects start with TypeScript, and companies increasingly require it for senior roles.
Sample Interview Questions
Explain the difference between interface and type. When would you use each?
Implement a generic type-safe event emitter class with typed event names and payloads.
What are conditional types? Write a utility type that extracts the return type of a Promise.
Explain type narrowing and type guards. Implement a custom type guard function.
What are mapped types? Create a utility type that makes all properties optional and nullable.
How to Prepare
Understand union types, intersection types, and literal types
Master generics and know when to use constraints
Practice with utility types: Partial, Required, Pick, Omit, Record
Know the difference between type assertions and type guards
Be comfortable with declaration files and module augmentation
Related Skills
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