test01.ts

abstract class AbstractInternal<T> {
    public abstract method(arg: T): void;
}

type InternalCtor<T> = new (param: T) => AbstractInternal<T>;

function createClass<T>(data: T): InternalCtor<T> {
    abstract class Internal<T> implements AbstractInternal<T>
    {
        public constructor(arg: T) {
            console.log(data, arg);
        }

        public abstract method(arg: T): void;
    }

    return Internal as InternalCtor<T>;
}

class A extends createClass<number>(1) {
    public method(arg: number) { // now I need to implement this to avoid a compilation error
        console.log('hello');
    }
}

const z = new A(2); // 1 2