src/js/app/places.js



define(['leaflet'], function(L) {

    // GeoJSON feature grouping
    function returnMarker(feature, latlng) {
        var marker = new L.marker(
            latlng,
            { opacity: 0.01 });
        // bindTooltip was introduced in LeafletJS 1.0.
        try {
            marker.bindTooltip(
                feature.properties.name,
                {permanent: true });
        } catch (e) {
            if (console) {
                console.warn('tooltip skipped (using an old Leaflet?)');
            }
        };
        return marker;
    };

    var place = L.geoJson([], {
        pointToLayer: returnMarker
    });

    return function(data) {
        place.addData(data);
        return L.layerGroup().addLayer(place);
    };
});