class MyClass {}
  export const myClassSingleton = new MyClass()

Static blocks only run once, like the class declaration itself:

  class User {
    constructor(public name: string, public age: number) {}

    static {
      console.log("Hello from class User static block")
    }
  }

  const a = new User("a", 1)
  const b = new User("b", 2)

  class User {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }
  }
  (() => {
    console.log("Hello from class User static block");
  })();
  const a = new User("a", 1);
  const b = new User("b", 2);