add
open fun addStyleCustomLayer(@NonNull layerId: String, @NonNull layerHost: CustomLayerHost, @Nullable layerPosition: LayerPosition): Expected<String, None>
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Adds a new [style custom layer](https://docs.mapbox.com/mapbox-gl-js/style-spec/#layers). Runtime style layers are valid until they are either removed or a new style is loaded.
Return
A string describing an error if the operation was not successful, or empty otherwise.
Parameters
layer
A style layer identifier.
layer
The `custom layer host`.
layer
If not empty, the new layer will be positioned according to `layer position` parameters.