src/js/app/mapfactory.js



define(['leaflet'], function(L) {
    // base config
    var attribOSM = '&copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors';
    var attribCarto = '&copy; <a href="https://cartodb.com/attributions">CARTO</a>';
    var licenseODbL ='under the <a href="https://opendatacommons.org/licenses/odbl/1.0/">ODbL 1.0</a> license';
    var TileLayer = L.tileLayer('https://cartodb-basemaps-{s}.global.ssl.fastly.net/light_all/{z}/{x}/{y}.png', {
            attribution: 'Imagery ' + attribCarto + ' &mdash; Map data ' + attribOSM + ' ' + licenseODbL,
            subdomains: 'abcd',
            maxZoom: 19
        }),
        scale = L.control.scale({
            imperial: false
        });

    return function(id, bounds) {
        var map = L.map(id, {
                layers: [TileLayer]
            })
        if (bounds) {
            map.fitBounds(L.latLngBounds(bounds));
        } else {
            map.fitWorld().zoomIn();
        }
        map.attributionControl.setPrefix(false);

        scale.addTo(map);

        return map;
    };
});