Type Signature · #41 · 2026-05-15
What is type `R`?
TypeScript ·Difficulty 2/3
How to play
Read the TypeScript snippet and pick the correct type from four choices. Think about inference, narrowing, and utility types. Press 1–4 or click to answer.
type ParseRoute<T> = T extends `/${infer Seg}/${infer Rest}` ? Seg : never;
type R = ParseRoute<'/users/123/posts'>;
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Press 1 through 4, or tap a numbered choice, to answer. Back to hub