code: function _unwatchPath(path) {
      var watcher = _watcherMap[path];
  
      if (watcher) {
          try {
              watcher.close();
          } catch (err) {
              console.warn("Failed to unwatch file " + path + ": " + (err && err.message));
          } finally {
              delete _watcherMap[path];
          }
      }
  }
docs: Un-watch a file or directory.
  @private
  @param {string} path File or directory to unwatch.