code: def date_sorted_sources(*sources):
      """
      Takes an iterable of sources, generating namestrings and
      piping their output into date_sort.
      """
      sorted_stream = heapq.merge(
          *(_decorate_source(s) for s in sources)
      )
  
      # Strip out key decoration
      for _, message in sorted_stream:
          yield message
  
label_desc: Use image node_id 2 for calling a global function with example usage: date_sorted_sources() without return types