function getWatchPath(event, path) {
  if (!event || event === '' || !path) {
    throw new Error('Event and path are required')
  }
  return `${event}:${path.substring(0, 1) === '/' ? '' : '/'}${path}`
}
@private
@param {string} event - Type of event to watch for
@param {string} path - Path to watch with watcher
@returns {string} watchPath