typescript decorator for inherited classes

gistfile1.txt

// typeof any non-abstract child of Base
type ChildOfBase = typeof Base & (new (...args: any[])=> Base);

// decorator
const ClassDecorator = function(valueA: string): (value: ChildOfBase) => ChildOfBase {
    return (value: ChildOfBase) => {
        value.prototype.DoSmthWithClassName = () => {
            return value.name + ".DoSmth_" + value.A;
        }
        value.A = value.name + valueA;
        return value;
    }
}

abstract class Base {
    public static A: string = "Base_A";
    public DoSmthWithClassName(): string {
        return Base.name + ".DoSmth_" + Base.A;
    }
    private C: string;
    public constructor(...args: any[]);
    public constructor(c: string) {
        this.C = c;
    }
}

@ClassDecorator("NewA")
class Derived extends Base {

    constructor(c: string) {
        super(c);
    }
}