In 3.15, you can use third party Vector Tiles by setting the Access Token like this:
VectorTileLayer.ACCESS_TOKEN = " ";
var vectorTileLayer = new VectorTileLayer("mapbox://styles/mapbox/streets-v8");
Is there a way to do this in 4.0 beta 3? There seems to be no mention of using an Access Token in the API documentation. For now, are we only able to use the listed Esri Vector Tile URLs (World Base Map and 8 JSON style objects) in the documentation?