Sometimes, we want to define a singleton in TypeScript.

In this article, we’ll look at how to define a singleton in TypeScript.

How to define a singleton in TypeScript?

To define a singleton in TypeScript, we can create a class with a getter to return the singleton instance.

For instance, we write

class MyClass {
  private static _instance: MyClass;

  private constructor() {
    //...
  }

  public static get Instance() {
    return this._instance ?? (this._instance = new this());
  }
}

const myClassInstance = MyClass.Instance;

to create the Instance static getter in the MyClass class.

We return this._instance if it’s defined or assign a new MyClass instance to this._instance and return it with

this._instance = new this()

Conclusion

To define a singleton in TypeScript, we can create a class with a getter to return the singleton instance.