Type Signature · #26 · 2026-04-30
What is type `R`?
TypeScript ·Difficulty 3/3
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 ToArray<T> = T extends any ? T[] : never;
type R = ToArray<string | number>;
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