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Union to Intersection

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type UnionToIntersection<U> =
  (U extends U ? (arg: U) => void : never) extends (arg: infer I) => void ? I : never
提出日時2023-09-19 03:39:47
問題Union to Intersection
ユーザーsankantsu
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<UnionToIntersection<'foo' | 42 | true>, 'foo' & 42 & true>>,
  Expect<Equal<UnionToIntersection<(() => 'foo') | ((i: 42) => true)>, (() => 'foo') & ((i: 42) => true)>>,
]