{
  safe: (val) => (val != null ? '' + val : ''),
  base_url: () => 'https://api.mureka.ai',
  song_query_url: (task_id) => 'https://api.mureka.ai/v1/song/query/' + task_id,
  instrumental_query_url: (task_id) => 'https://api.mureka.ai/v1/instrumental/query/' + task_id,
  format_task: (task_id, status) => 'Task ' + task_id + ' status: ' + status
}
