[求助] typescript获取不到定义了索引类型的对象的键的联合类型的问题？

Programming
1

获取对象的键的联合类型的方法是：

const person = {
	infoA:{
		name: 'frankA',
		age: 10,
	},
	infoB:{
		name: 'frankB',
		age: 20,
	}
}

type PersonKeys = keyof typeof person;
//结果 type PersonKeys = "infoA" | "infoB";

但是如果给person定义类一个索引类型之后就无法再获取对象的键的类型了

type PersonInfo = {
    name: string;
    age: number;
};

type Person = {
    [key in string]: PersonInfo;
};

const person: Person = {
    infoA: {
        name: 'frank',
        age: 10,
    },
    infoB:{
        name: 'frankB',
        age: 20,
   }
};

type PersonKeys = keyof typeof person;
//结果 type PersonKeys = string;

我要怎么做才能获取和第一个例子一样的结果？

更新：目前的解决方法是使用 satisfies 关键字:

type PersonInfo = {
    name: string;
    age: number;
};

type Person = {
    [key in string]: PersonInfo;
};

const person = {
    infoA: {
        name: 'frank',
        age: 10,
    },
    infoB:{
        name: 'frankB',
        age: 20,
   }
} satisfies Person;
type PersonKeys = keyof typeof person;
//结果 type PersonKeys = "infoA" | "infoB";