TypeScript:元组类型到对象类型

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考虑这样的元组:

type MyTuple = [A, B];

其中A 和B 都有一个名为key 的属性.例如，

where A and B both have an attribute named key. For instance,

interface A = { key: 'sandwiches' } interface B = { key: 'pasta' }

我想要以下界面:

interface Result { sandwiches: A; pasta: B; }

有没有办法动态地做到这一点?

Is there a way to do this dynamically?

我在想，如果这是可以实现的，它可能看起来像:

I'm thinking that, if this is achievable, it might look something like:

type MapTuple<T> = { [K in keyof T]: T[K]["key"] }

但这不起作用.

这个问题是 Typescript 的逆:对象类型到数组类型(元组)

This question is the inverse of Typescript: object type to array type (tuple)

推荐答案

这将产生预期的效果.您需要映射元组的所有键属性并为每个键提取元组成员:

This will produce the desired effect. You need to map over all the key properties of the tuple and extract the tuple member for each key :

type MyTuple = [A, B]; interface A { key: 'sandwiches' } interface B { key: 'pasta' } type MapTuple<T extends Array<{ key: string }>> = { [K in T[number]['key']]: Extract<T[number], { key : K}> } type R = MapTuple<MyTuple>