Function hasMmapLayer

hasMmapLayer(layerXs): boolean
Whether the layer extensions contain an mmap layer. The layer may be nested within a group layer.
Parameters
- layerXs: (LayerExtension<LayerExtensionProperties> | GroupLayerExtension<LayerExtensionProperties, LayerExtension<LayerExtensionProperties>, GroupLayerExtensionCollection<LayerExtensionProperties, LayerExtension<LayerExtensionProperties>>>)[]
  The layers to interrogate.
Returns boolean