Values_0.TransitGatewayRouteAttachmentSourceDescribes a route attachment.
type nonrec t = {resourceId : String_.t option;The ID of the resource.
*)transitGatewayAttachmentId : String_.t option;The ID of the attachment.
*)resourceType : TransitGatewayAttachmentResourceType.t option;The resource type. Note that the tgw-peering resource type has been deprecated.
*)}