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singleton and the module.

https://wanago.io/2019/11/11/javascript-design-patterns-1-singleton-and-the-module/



class Singleton {
  static instance;
  constructor() {
    // your logic here
  }
  static getInstance() {
    if (Singleton.instance) {
      return Singleton.instance;
    }
    Singleton.instance = new Singleton();
    return Singleton.instance;
  }
}

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