Recursive enumeration of all files in a Google Drive folder to text file on Drive

enumerateDrive.gs

function getAllFiles(folderId) {
  const accumulated = [];
  const folder = DriveApp.getFolderById(folderId);

  // Function to copy a file to GCS, handling file or folder path as argument
  function traverseOrReturnItem(item, currentPath) {
    const itemName = item.getName(); // Handles file or folder names
    const thisPath = `${currentPath}${currentPath ? "/" : ""}${itemName}`; // Construct GCS object key

    // if (typeof item === 'object' && item.getMimeType() ? false : true && DriveApp.getFolderById(item.getId()) ? true : false) { // If it's a folder, process contents recursively

    if (Object.hasOwn(item, "getFiles")) {
      // Logger.log("thiis is a folder")
      const directoryFiles = item.getFiles();
      while (directoryFiles.hasNext()) {
        traverseOrReturnItem(directoryFiles.next(), thisPath); // Recursive call
      }

      const subFolders = item.getFolders();
      while (subFolders.hasNext()) {
        traverseOrReturnItem(subFolders.next(), thisPath); // Recursive call
      }
    } else if (Object.hasOwn(item, "getBlob")) {
      // Logger.log("this is a file")
      //Logger.log(`${thisPath}`)
      accumulated.push([item.getId(), thisPath]);
    }
  }

  traverseOrReturnItem(folder, ""); // Start with the main folder
  return (accumulated);
}

function writeFileSummaryToDrive(folderId) {
  const allFiles = getAllFiles(folderId);
  const allFilesContent = allFiles.map(file => `${file[0]}: ${file[1]}`).join('\n');

  // Search for an existing file named 'allfiles.txt'
  const files = DriveApp.getFilesByName('allfiles.txt');
  let file;

  if (files.hasNext()) {
    file = files.next();
    file.setContent(allFilesContent);
  } else {
    file = DriveApp.createFile('allFilesSummary.txt', allFilesContent);
  }

  Logger.log('File written: ' + file.getUrl());
}