推断TypeScript中的构造函数类型

Question

Is it possible to infer the constructor type of a class in TypeScript? I tried this but it seems not to work:

type Constructor<K> = K extends { new: infer T } ? T : any;

Answer 1

Instead of trying to infer it, can you refer to class types by their constructor functions like this?

type Constructor<K> = { new(): K };

const x: Constructor<String> = String; 

const s = new x();

Answer 2

There is already a predefined conditional type that allows you to extract the instance type from a class type, called InstanceType

class A { private x: any}

type AInstance = InstanceType<typeof A> // same as A

The definition of this type is:

type InstanceType<T extends new (...args: any) => any> = T extends new (...args: any) => infer R ? R : any;