How do I change the basemap programmatically?

JoseVidal

I am building a custom widget for WAB. To start with, I just want to build a button that switches between the 'streets' and the 'topo' basemap.

I created a working widget and in it I have this code:

let newMap = new Map("map", {
  basemap: "streets",
  center: [-105.255, 40.022],
  zoom: 13
});
console.log("newMap")
console.log(newMap)
this.map = newMap

Which creates a new Map, and does not generate any errors, but also does not change the map.

I am guessing I need to do more than just `this.map = newMap`. But, what?

There is no documentation on this.