code: def div_filter(key: str, value: list, format: str, meta: Any) -> Optional[list]:
      
      if key != "Div" or format != "latex":
          return None
  
      [[_, classes, _], contents] = value
      try:
          alert_type = [name.split("-")[1] for name in classes if "-" in name][0]
      except IndexError:
          return None
  
      if alert_type not in ALLOWED_ALERT_TYPES.__members__:
          return None
  
      filtered = [RawBlock("latex", rf"\begin{{{alert_type}box}}")]
      filtered.extend(contents)
      filtered.append(RawBlock("latex", rf"\end{{{alert_type}box}}"))
      return filtered
docs: Filter the JSON ``value`` for alert divs.
  
      Arguments
      ---------
      key
          Key of the structure
      value
          Values in the structure
      format
          Output format of the processing
      meta
          Meta information