code: function createFsWatchInstance(path, options, listener, errHandler, emitRaw) {
    const handleEvent = (rawEvent, evPath) => {
      listener(path);
      emitRaw(rawEvent, evPath, {watchedPath: path});
  
      // emit based on events occurring for files from a directory's watcher in
      // case the file's watcher misses it (and rely on throttling to de-dupe)
      if (evPath && path !== evPath) {
        fsWatchBroadcast(
          sysPath.resolve(path, evPath), 'listeners', sysPath.join(path, evPath)
        );
      }
    };
    try {
      return fs.watch(path, options, handleEvent);
    } catch (error) {
      errHandler(error);
    }
  }
docs: Instantiates the fs_watch interface
  @param {String} path to be watched
  @param {Object} options to be passed to fs_watch
  @param {Function} listener main event handler
  @param {Function} errHandler emits info about errors
  @param {Function} emitRaw emits raw event data
  @returns {fs.FSWatcher} new fsevents instance