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Frontend interview articles

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2 articles

Type-Level Testing + Public API Design (Library Author Mindset)

How to keep TypeScript APIs stable: test your types, design exports intentionally, and avoid leaking internals that you can’t maintain.

#API Design#Interviews

Mar 01, 2026Practice

TypeScript2 min read

unknown → Safe Types: Runtime Validation Patterns

Stop lying with `as`. Learn production patterns to convert unknown data (fetch, localStorage, env) into safe TypeScript types with guards and assertions.

#Interviews#API Design

Mar 01, 2026Practice