Replace Union
题目
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.
解题思路
待补充
答案
type UnionReplace<T, U extends [any, any][]> = any验证
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>>,
]参考
无
