export function Singleton<T>() {
    class SingletonT {
        protected constructor() {}
        private static _Instance: SingletonT|null = null;
        public static get Instance(): T {
            if(SingletonT._Instance == null) {
                SingletonT._Instance = new this();
            }
            return SingletonT._Instance as T;
        }
    }

    return SingletonT;
}