create an object based on the type of another object in TypeScript

Question

how to create an object based on the type of another object in TypeScript

obj1 = new Object();

obj2 = new "obj1.constructor.name"

I have to do like that because Object 1 can have different class .

Answer 1

The typescript compiler will complain if you try to do:

new obj1.constructor()

But you can tell it that it's ok like this:

class A {}

class B extends A {}

type AConstructor = {
    new(): A;
}

type BConstructor = {
    new(): B;
}

let a1 = new A();
let a2 = new (a1.constructor as AConstructor)();

let b1 = new B();
let b2 = new (b1.constructor as BConstructor)();

( code in playground )