Simple desklet for Cinnamon (desktop environment)

desklet.js

const Desklet = imports.ui.desklet;
const St = imports.gi.St;

function MyDesklet(metadata, desklet_id) {
    this._init(metadata, desklet_id);
}

MyDesklet.prototype = {
    __proto__: Desklet.Desklet.prototype,

    _init: function(metadata, desklet_id) {
        Desklet.Desklet.prototype._init.call(this, metadata, desklet_id);
        this.setupUI();
    },

    setupUI(){
      // creates container for one child
      this.window = new St.Bin();
      // creates a label with text
      this.text = new St.Label({text: "Hello Desktop"});
      // adds label to container
      this.window.add_actor(this.text);
      // Sets the container as content actor of the desklet
      this.setContent(this.window);
    },
};

function main(metadata, desklet_id) {
    return new MyDesklet(metadata, desklet_id);
}

metadata.json

{
    "max-instances": "10",
    "uuid": "first-desklet@rcassani",
    "name": "First Desklet",
    "description": "This is my first desklet",
    "version": "0.1",
    "prevent-decorations": false
}