closeWatcher(path) {
    // Ensure if called before `watch` to do nothing
    if (path !== null) {
      const watcher = this.watchers[path];
      if (watcher !== null) {
        watcher.close();
        this.watchers[path] = null;
      } else {
        //Watcher not found for path
      }
    }
  }
Closes an active watcher down.
@param {*} path The path to close the watcher for.