code: function onOutputError(err) {
      if (err.code === 'EACCES') {
          console.error(err.path + " is not writable. Skipping!");
      } else {
          console.error(err);
          process.exit(0);
      }
  }
docs: error handler for output stream that swallows errors silently, allowing the loop to continue over unwritable files.