man-roxygen/layer-params.r

In corybrunson/ggalluvial: Alluvial Plots in 'ggplot2'

#' @param na.rm Logical:
#'   if `FALSE`, the default, `NA` lodes are not included;
#'   if `TRUE`, `NA` lodes constitute a separate category,
#'   plotted in grey (regardless of the color scheme).
#' @param ... Additional arguments passed to [ggplot2::layer()].