Check for correct structure of CLUSTER_MARKERS_SOURCES or CONTRASTS_SOURCES.
      Source: R/config_process_common.R
      dot-check_marker_sources.RdCheck for correct structure of CLUSTER_MARKERS_SOURCES or CONTRASTS_SOURCES.
Usage
.check_marker_sources(
  marker_sources,
  check_test_params = FALSE,
  marker_type = c("global", "contrast")
)