Firebase : is class supported in cloud functions?

Based on my tests, both of the below work awesomely with cloud functions

class Hero {
    constructor(name, level) {
        this.name = name;
        this.level = level;
    }

    // Adding a method to the constructor
    greet() {
        return `${this.name} says hello.`;
    }
}

and

unction Hero(name, level) {
    this.name = name;
    this.level = level;
}

// Adding a method to the constructor
Hero.prototype.greet = function() {
    return `${this.name} says hello.`;
}


references:
https://www.digitalocean.com/community/tutorials/understanding-classes-in-javascript#classes-are-functions