[LayaAirIDE 2.0]多个模块之间相互嵌套import，导致运行报错

class Animal implements EventEmiter

{

    public sex: number = 0;



    public Create(): void

    {}



    public Attack(): void

    {

        this.emit('attack');

    }

}

public CreateCat(): void

    {

        let self = this;

        let cat = new Cat();

        cat.Create();

        cat.on('attack', function () {

            self.Change();

        });

        this.animals.push(cat);

    }