How to define Singleton in TypeScript

Question

What is the best and most convenient way to implement a Singleton pattern for a class in TypeScript? (Both with and without lazy initialisation).

Answer 1

i think maybe use generics be batter

class Singleton{
    public static Instance(c: {new(): T; }) : T{
        if (this._instance == null){
            this._instance = new c();
        }
        return this._instance;
    }

    private static _instance = null;
}

how to use

step1

class MapManager extends Singleton{
     //do something
     public init():void{ //do }
}

step2

    MapManager.Instance(MapManager).init();