元の関数

recursive.gs

// rootFolder: Folderクラス
// type: both, onlyFolder, onlyFile
// func: function(object: Folder or File, type: "Folder" or "File")
function recursive(rootFolder, type, func) {
  const files = rootFolder.getFiles()
  const folders = rootFolder.getFolders()

  if(type=="both" || type=="onlyFile"){
    while(files.hasNext()){
      func(files.next(), "File")
    }
  }

  while(folders.hasNext()){
    const folder = folders.next()
    if(type=="both" || type=="onlyFolder") { func(folder, "Folder") }
    recursive(folder, type, func)
  }

}

使い方

listAllFileAndFolder

function listAllFileAndFolderInFolder(folder){
  recursive(folder, "both", function(folderOrFile, type){
      console.log(type) // Folder or File
      console.log(folderOrFile.getName())
      console.log(folderOrFile.getUrl())
  })
}