return {
  CodeBlock = function(block)
    local fname = os.tmpname()
    do
      local _with_0 = io.open(fname, "w")
      _with_0:write(block.text)
      _with_0:close()
    end
    if block.classes[1] == "moon" or block.classes[1] == "moonscript" then
      local p = io.popen(("pygmentize -f html -l moonscript.py %s -x"):format(fname))
      local out = p:read("*a")
      p:close()
      return pandoc.RawBlock("html", out)
    else
      local status, handle_or_error = pcall(function()
        return io.popen(("pygmentize -f html -l %s %s"):format(block.classes[1], fname))
      end)
      local sout = handle_or_error:read("*a")
      if block.classes[1] == "heex" then
        return block
      else
        return pandoc.RawBlock("html", sout)
      end
    end
  end
}