prompt: Your task is to convert the following English description into an ASCII tree format.
  
  babel-plugin-external-helpers is a top-level directory that maintains 2 subdirectories: src and test.
  At the top level, The 'src' container remains unused.
  At the main level, 'test' organizes tests across 1 separate directory entries.
  In nested path 'test > fixtures', 'fixtures' retains 1 child directories: opts.
  In nested path 'test → fixtures → opts', 'opts' carries 1 subfolders: whitelist.
  At level 4, in directory path 'test / fixtures / opts / whitelist', 'whitelist' holds no subdirectories at the moment.
  
  
  Format your response in this style:
  ```
  es_declare_module
   +--__snapshots__
   `--flow-typed
       `--__snapshots__
  ```
  
  Provide your answer wrapped in <ascii_formatted> tags.
verification_info: {"ground_truth": "babel-plugin-external-helpers\n +--src\n `--test\n     `--fixtures\n         `--opts\n             `--whitelist", "description": "babel-plugin-external-helpers is a top-level directory that maintains 2 subdirectories: src and test.\nAt the top level, The 'src' container remains unused.\nAt the main level, 'test' organizes tests across 1 separate directory entries.\nIn nested path 'test > fixtures', 'fixtures' retains 1 child directories: opts.\nIn nested path 'test \u2192 fixtures \u2192 opts', 'opts' carries 1 subfolders: whitelist.\nAt level 4, in directory path 'test / fixtures / opts / whitelist', 'whitelist' holds no subdirectories at the moment.\n"}