How to use the blessed-contrib.map function in blessed-contrib

data: [{
            percent: 60,
            label: '.text',
            color: 'green',
        }, {
            percent: 30,
            label: '.data',
            color: 'red',
        }, {
            percent: 10,
            label: '.header',
            color: 'yellow',
        }]
    });
    screen.append(donut);
    var map = contrib.map({
        label: 'World Map',
        border: config.border,
        width: '80%',
        height: '60%',
        draggable: true
    });
    //map.addMarker({"lon" : "-79.0000", "lat" : "37.5000", color: "red", char: "X" })
    screen.append(map);
    var tree = contrib.tree({
        fg: 'orange',
        label: 'Fruit Tree',
        border: config.border,
        width: '50%',
        height: '30%',
        draggable: true
    });