未知长度数组中所有对象的交集的打字稿类型 [英] Typescript type of intersection of all objects in array of unknown length

问题描述

我在 Typescript 中有一个对象数组类型.让我们说:

I have a type of an array of object in Typescript. Let's say:

type Arr = [{ toto: string}, {titi: number}];

我事先不知道长度.我想要数组中所有对象的合并类型，即交集

I don't know the length in advance. I would like to have the type of the merge of all objects in the array, ie the intersection

{
  toto: string,
  titi: number
}

谢谢！

推荐答案

如您所见，您可以使用 Arr[number] 来获取数组中所有类型的联合.然后，您可以使用 UnionToIntersection 描述的此处进行转换它到一个路口:

As you discovered, you can use Arr[number] to get a union of all types in the array. You can then use UnionToIntersection described here to convert it to a intersection :

type Arr = [{ toto: string}, {titi: number}];
type UnionToIntersection<U> = 
  (U extends any ? (k: U)=>void : never) extends ((k: infer I)=>void) ? I : never

type All = UnionToIntersection<Arr[number]>

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