SOURCE

class A(){
    constructor(){
        this.addA();
    };
    addA(){
        let Aa = new B();
        Aa.b = c;
      console.log(222)
    }

}
class B(){
    constructor(){
    };
    addB(){
        console.log(1111);
    }

}
class C(){
    constructor(){
       this.addc();
    };
    addc(){
        let d = new A();
        d.Aa.addB();
    }
}