3 pages from the guide: the cover, the contents (75 questions in 7 sections) and one complete question with its answer, code and interview tips.
This guide answers 75 TypeScript questions that go past 'what is an interface': why a cast is not validation, how a discriminated union stays exhaustive, what infer does, and why Object.keys returns string[]. It is organised in seven sections, from any versus unknown and type guards through generics, mapped and conditional types, modules and tsconfig, to the traps around structural typing, enums and variance. Where a question is about a compiler rule, the snippet shows the real error text from TypeScript 5.9.
75 questions in 7 sections, 75 code examples in a 94-page PDF (2026 edition).
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Read the question, say your answer out loud, then compare it with the quick answer. Run the snippets in the TypeScript playground or a local project and change them to see the errors move. Work through the generics and conditional-type sections last, and save the gotchas for the final read before your interview.
Tech Tribersnever, and how do you add it to a switch?After you handle every member of a union, the leftover type is never. Passing the leftover value to a function that takes never makes the compiler fail the build as soon as a new member is added and not handled. The helper is usually called assertNever.
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It covers this topic in depth. It is one topic from the TechTribers Java Interview Series, which has all 23 parts (1,200+ questions) in one bundle.
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