This is an example
Riot application that shows how to use
esri-loader to create a custom
<esri-map-view>
component.
There's a custom component below for each named basemap option in the ArcGIS API for JavaScript.
<esri-map-view zoom="4" basemap="oceans"></esri-map-view>
<esri-map-view rotation="180" basemap="streets-vector"></esri-map-view>