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export function Singleton<E>() {
    class SingletonE {
        protected constructor() {}
        private static _ins: SingletonE = null;
        public static get Ins(): E {
            if (SingletonE._ins == null) SingletonE._ins = new this();
            return SingletonE._ins as E;
        }
    }
    return SingletonE;
}

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export class Game extends Singleton() {
    isText: boolean = false;
}

console.log(Game.Ins.isText);