JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdn.leafletjs.com/leaflet-0.5.1/leaflet.js"></script>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.5.1/leaflet.css">
<div id="map"></div>

CSS

html, body, #map {
    padding: 0;
    margin: 0;
    height: 100%;
}

JavaScript

L.Site = {};

L.Site.TileLayer = L.TileLayer.extend({
	statics: {
		OPTIONS: {
            minZoom: 0,
            maxZoom: 18,
            attribution: 'Map data &copy; OpenStreetMap contributors'
		},
		TILEURL: 'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'
	},

	initialize: function (options) {
        this.options = L.Util.extend({}, this.options, L.Site.TileLayer.OPTIONS, options);
		this._url = L.Site.TileLayer.TILEURL;
	},
});


var map = new L.Map('map');

var tilelayer = new L.Site.TileLayer({
    foo: 'bar'
});

map.addLayer(tilelayer);
map.setView(new L.LatLng(19.4117088, -99.1805968),16);

console.log(tilelayer);