code: def report_watchdog_availability():
      if not watchdog_available:
          if not config.get_option("global.disableWatchdogWarning"):
              msg = (
                  "\n  $ xcode-select --install"
                  if env_util.IS_DARWIN
                  else ""
              )
  
              click.secho(
                  "  %s"
                  % "For better performance, install the Watchdog module:",
                  fg="blue",
                  bold=True,
              )
              click.secho(
                  """%s
    $ pip install watchdog
              """
                  % msg
              )
  
file_path: streamlit/lib/streamlit/watcher/path_watcher.py
imports: from typing import Callable, Optional, Type, Union
  import click
  import streamlit.watcher
  from streamlit import config, env_util
  from streamlit.logger import get_logger
  from streamlit.watcher.polling_path_watcher import PollingPathWatcher
label_desc: Use image node_id 1 for calling a global function with example usage: report_watchdog_availability() without return types