How-to add an AGS Tile Layer

By example!

Here is a small example on how to add the world map from Arc-Online using the XYZ layer type:

<map-source name="ags-tile-example" type="xyz">
    <layer name="imagery"/>
    <url>https://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}</url>
</map-source>