A basemap layer is a layer that provides geographic context to the map. A web map always contains a basemap. The basemap has a title and is the combination of each baseMapLayer. It is required that a baseMap be saved within the web map.
|ILayer | ILayer||
An array of baseMapLayer objects defining the basemaps used in the web map.
Required string title for the basemap that can be used in a table of contents. It takes the title of the first baseMapLayer in the array.
Interface defined in packages/arcgis-rest-types/src/webmap.ts:634