toJson method

Implementation

core.Map<core.String, core.dynamic> toJson() {
  final chart = this.chart;
  final chartReference = this.chartReference;
  final container = this.container;
  final filter = this.filter;
  return {
    'chart': ?chart,
    'chartReference': ?chartReference,
    'container': ?container,
    'filter': ?filter,
  };
}