typescript接口的主键类型

Question

考虑以下接口:

interface User {
id: number;
name: string;
email: string;
address: {
country: string;
city: string;
state: string;
street: string;
}
active: boolean;
}

我需要创建一个泛型PrimaryKey类型，但它应该只对应于字符串或数字，而省略任何其他类型。

因此在PrimaryKey<User>的情况下，只有id、name和email被认为是有效的主键。

我如何做到这一点?

Answer 1

也许你可以试试这个:

interface User {
id: number;
name: string;
email: string;
address: {
country: string;
city: string;
state: string;
street: string;
}
active: boolean;
}
type ExtendedKeyOnly<T extends object, KeyType = string | number> = {
[K in keyof T as T[K] extends KeyType ? K : never]: T[K];
};
type PrimaryKeyUser = ExtendedKeyOnly<User>;
type KeyOnlyPrimaryKeyUser = keyof PrimaryKeyUser;