anchor.diff:    String _formattedRange;
     String get formattedRange => _formattedRange;
     String _getFormattedRange(DatepickerComparison value) =>
  -      value?.range != null ? formatRange(value.range) : placeHolderMsg;
  +      value?.range != null ? rangeFormatter(value.range) : placeHolderMsg;
   
     bool get hasComparison => selection.value?.comparison != null;
   
     String _formattedComparison;
     String get formattedComparison => _formattedComparison;
     String _getFormattedComparison(DatepickerComparison value) =>
  -      _compareMsg(formatRange(value?.comparison));
  +      _compareMsg(rangeFormatter(value?.comparison));
   
     void _updateFormattedRanges(DatepickerComparison value) {
       _formattedRange = _getFormattedRange(value);
  
positive.code: import 'package:angular_components/utils/angular/css/css.dart';
  import 'package:angular_components/utils/browser/dom_service/dom_service.dart';
  import 'package:angular_components/utils/disposer/disposer.dart';
  
  /// A material-design-styled date range picker.
  ///
  
negative.code:     }
    }
  
    /// Custom date range formatter function to apply to dropdown button text.
    @Input()
    RangeFormatter rangeFormatter = formatRange;
  
    List<ComparisonOption> _comparisonOptions;
  
    @ViewChild('focusOnClose')
  