TypeScript函数构造签名

class Ctor {
    name: string
    constructor(s: string) {
        this.name = s
    }
}

type SomeContructor = {
    new (s: string): Ctor
}

function fn(ctor: SomeContructor) {
    return new ctor('zhangsan.')
}

const f = fn(Ctor)