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@aral I don't understand.

```js
class Base {
bla() {
console.log("base");
}
};

class Derived extends Base {
bla() {
console.log("derived");
}
};

/**
* @template {Base} T
* @param {T} base
*/
function fun(base) {
base.bla();
}

fun(new Base());
fun(new Derived());

/**
*
* @param {typeof Base} cls
*/
function makeBase(cls) {
return new cls();
}

makeBase(Base).bla();
makeBase(Derived).bla();
```