getTranscludeNode = (tiddler, isBlock) =>
  ({
    type: 'transclude',
    attributes: {
      tiddler: {
        type: 'string',
        value: getTiddlerRef(tiddler) }},
    children: [],
    isBlock: !!isBlock
  })
@param {Tiddler} tiddler
@param {boolean} isBlock