anchor.diff:  ///
   /// http://www.chartjs.org/docs/#line-chart-data-structure
   @JS()
  +@anonymous
   class DataSet {
     external String get label;
     external String get fillColor;
  
positive.code: ///
  /// http://www.chartjs.org/docs/#getting-started-global-chart-configuration
  @JS()
  class Options {
    external bool get responsive;
  
  
negative.code: }
  
  @JS()
  @anonymous
  class Data {
    external List get labels;
    external List<DataSet> get datasets;
  