What is the bad practice in my javascript code? [closed]

I have this code in Javascript and I need to know what is the bad practice, but i don´t know, I was reading the page “Code smells” but i didn’t find anything. Source: https://refactoring.guru/

class Employee {
    eat() {
        //...
    }
    drink(){
        //...
    }
    work(){
        //...
    }
    sleep(){
        ///...
    }
    walk(){
        //...
    }
}