Storing the type of a generic in an interface in typescript-CodePudding

I have a generic interface like so:

interface A<T extends Object> {
  b: T;
}

Currently "b" is stored as an instance of T, however I would like to store the non-instanced version of T as a value within the interface.

My initial thought was to do something like this:

interface A<T extends Object> {
  b: typeof T;
}

However I don't think this is correct, nor is it allowed by the compiler. Can this be done?

This below succeeds in what I want to achieve, however it does not enforce 'b' to the generic:

interface A<T extends Object> {
  b: Object;
}

CodePudding user response：

You can use a construct signature to refer to the type of a class constructor. It looks like this:

interface A<T extends object> {
    instance: T; 
    ctor: new (...args: any) => T; 
}

And here's an example of using it:

const aDate: A<Date> = {
    instance: new Date(),
    ctor: Date
} // okay