Input and output types are not taken into account in automation scripting

    <scriptedOperation id="javascript.SFGetChildren">
      <inputType>void</inputType>
      <outputType>void</outputType>
      <category>javascript</category>
      <description></description>
      <script><![CDATA[function run(input, params) {
  var docs = Repository.Query(null, {
    'query': "SELECT * FROM Document WHERE ecm:currentLifeCycleState != 'deleted' AND ecm:isCheckedInVersion = 0 AND ecm:mixinType != 'HiddenInNavigation' AND ecm:parentId = '" + input + "'"
  }
                             );
  return docs;
}
]]></script>
    </scriptedOperation>