(() => {
    function myLoggingDecorator(target, propertyKey: string, descriptor: PropertyDescriptor): any {
        var oldValue = descriptor.value;
        descriptor.value = function () {
            console.log(`Calling "${propertyKey}" with arguments`, arguments);
            let value = oldValue.apply(null, arguments);
            return value;
        };
        return descriptor;
    }

    class MyMediumBlogPost {
        author = "Ruban";

        @myLoggingDecorator
        demo(arg1, arg2) {
            // Some complex operations here
            return true;
        }
    }
    const meetup = new MyMediumBlogPost();
    console.log(meetup.demo("Hello", "World"));
})();