code: function watch(arg_src_dir)
  {
  	console.info('Watching for change on: ' + arg_src_dir)
  	
  	const watch_settings = { ignored: /[\/\\]\./, persistent: true }
  	var watcher = chokidar.watch(arg_src_dir, watch_settings)
  	watcher.on('change', reload_file)
  	
  	return watcher
  }
docs: Watch directory files.
  
  @param {string} arg_src_dir - source directory.
  
  @returns {object} - watcher object.