code: function (opts) {
      this.options = opts || {};
      this.pattern = null;
      this.middleware = {};
      this.includes = {};
      this.excludes = {};
      this.files = [];
      this.fns = [];
  
      options(this);
      iterators(this);
      symlinks(this);
      readers(this);
    }
docs: Initialize private objects.