https://developers.arcgis.com/flutter/api-reference/reference/arcgis_maps/ReturnLayerAttachmentOption/values-constant.html
values constant - ReturnLayerAttachmentOption enum - arcgis_maps library - Dart API
API docs for the values constant from the ReturnLayerAttachmentOption enum, for the Dart programming language.
maps libraryvaluesconstantenumarcgis