code: def register_subcommand(parser: _SubParsersAction):
      scan_cache_parser = parser.add_parser(
          "scan-cache", help="Scan cache directory."
      )
  
      scan_cache_parser.add_argument(
          "--dir",
          type=str,
          default=None,
          help="cache directory to scan (optional). Default to the default HuggingFace cache.",
      )
      scan_cache_parser.add_argument(
          "-v",
          "--verbose",
          action="count",
          default=0,
          help="show a more verbose output",
      )
      scan_cache_parser.set_defaults(func=ScanCacheCommand)
  
file_path: hub-client/src/huggingface_hub/commands/scan_cache.py
imports: import time
  from argparse import Namespace, _SubParsersAction
  from typing import Optional
  from ..utils import CacheNotFound, HFCacheInfo, scan_cache_dir
  from .None import BaseHuggingfaceCLICommand
  from ._cli_utils import ANSI, tabulate
label_desc: Use image node_id 1 for calling the ScanCacheCommand obj's underlying member method code with example usage: obj.register_subcommand(parser) without return types