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13580-hard-replace-union
Hard

Fonte do Desafio: type-challenges/13580-hard-replace-union

Given an union of types and array of type pairs to replace ([[string, number], [Date, null]]), return a new union replaced with the type pairs.

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Casos de teste de: type-challenges/13580-hard-replace-union/test-cases.ts
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  // string -> null
  Expect<Equal<UnionReplace<number | string, [[string, null]]>, number | null>>,

  // string -> null
  Expect<Equal<UnionReplace<number | string, [[string, null], [Date, Function]]>, number | null>>,

  // Date -> string; Function -> undefined
  Expect<Equal<UnionReplace<Function | Date | object, [[Date, string], [Function, undefined]]>, undefined | string | object>>,
]