typescript - 创建嵌套映射类型

Question

我有两种类型:

type ContactPerson = {
  firstName: string
  lastName: string
}

type Customer = {
  companyName: string
  contactPerson: ContactPerson
}

我需要以通用方式将此类型映射到

type Result = {
  companyName: boolean[]
  contactPerson: {
    firstName: boolean[]
    lastName: boolean[]
  }
}

我可以映射根级别，但如何处理嵌套属性？

type BooleanResult<T> = {
  [Prop in keyof T]: boolean[]
}

Answer 1

我是这样解决的:

type BooleanResult<T> = {
  [K in keyof T]: T[K] extends object ? BooleanResult<T[K]> : boolean[]
}

它按预期工作，但类型信息显示:

type Result = {
    companyName: boolean[];
    contactPerson: BooleanResult<{
        firstName: string;
        lastName: string;
        email: string;
    }>;
}