firstPointColor property Null safety

Color? firstPointColor

Customizes the marker color of the first data point.

If the first data point is either the high data point or low data point, then the priority will be given to firstPointColor property.

Defaults to null.

 Widget build(BuildContext context) {
 return Scaffold(
   body: Center(
       child: SfSparkAreaChart(
     marker: SparkChartMarker(displayMode: SparkChartMarkerDisplayMode.all),
     data: <double>[18, 24, 30, 14, 28],


final Color? firstPointColor;