toJSON() {
    return {
      __type: 'Arguments',
      map: this.map,
      isList: this.isList,
      preserve: this.preserve,
      lineno: this.lineno,
      column: this.column,
      filename: this.filename,
      nodes: this.nodes
    };
  }
Return a JSON representation of this node.

@return {Object}
@api public