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.
/* _____________ Your Code Here _____________ */
type UnionReplace<T, U extends [any, any][]> = U extends [infer F, ...infer RT extends [any, any][]]
? F extends [infer ToBeReplaced, infer Replacer]
? UnionReplace<Exclude<T, ToBeReplaced> | Replacer, RT>
: UnionReplace<T, RT>
: T
/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
// string -> null
Expect<Equal<UnionReplace<number | string, [[string, null]]>, number | null>>,
// Date -> string; Function -> undefined
Expect<Equal<UnionReplace<Function | Date | object, [[Date, string], [Function, undefined]]>, undefined | string | object>>,
]标签：string,_____________,Union,Replace,130,UnionReplace,null,type,infer From： https://www.cnblogs.com/Answer1215/p/16964410.html