xhr.js

var xhr = require('xhr');
var Pbf = require('pbf');
var VectorTile = require('vector-tile').VectorTile;
		var queryURL='https://a.tiles.mapbox.com/v4/enf.i4lvj9k9/14/2821/6541.vector.pbf?access_token=pk.eyJ1IjoicGV0ZXJxbGl1IiwiYSI6ImpvZmV0UEEifQ._D4bRmVcGfJvo1wjuOpA1g'

		xhr({uri:queryURL,responseType:'arraybuffer'}, function (error, response, buffer) {

      console.log(arguments);


			    var tile = new VectorTile(new Pbf(buffer));
          console.log(tile);

				//populate geoJSON
				// for (var i=0; i<tile.layers.population.length; i++){
				// 	//convert each feature (within #population) into a geoJSON polygon, and push it into our variable
				// 	var feature = tile.layers.population.feature(i).toGeoJSON(tile[0], tile[1],tile[2]);
				// 	geojson.features.push(feature);
				// }
		});