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1097 - IsUnion #28759

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hajeonghun opened this issue Jul 10, 2023 · 0 comments

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hajeonghun commented Jul 10, 2023

type IsNever<T> = [T] extends [never] ? true : false;
type IsUnion<T, I = T> = IsNever<T> extends true ? false : (T extends I ? [I] extends [T] ? false : true : false)

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