gistfile1.js

define(['leaflet'], function (leaflet) {
    return function Leaflet(options) {
        this.show = function (selector, long, lat, zoom) {
             // ...
        }
    };
});


require(['map/' + providerName], function (Map) {
    var map = new Map(this.options.providers[providerName]);
    map.show(constants.mapElementId, loc.long, loc.lat, loc.zoom);
});