How can I return a new Type in typescript?

Question

I'm trying to write a d.ts file for a lib which provide a static method extend to create new type(sub type):

const SubType = SimpleLib.extend(proto);
const instance = new SubType();

How to write the d.ts file?

Answer 1

You could use a generic, something like:

declare type Constructor<T> = new (...args: any[]) => T;

function extend<T extends Constructor>(ConstructorToExtend: T) => T;