Key in the data array for this series' y-values.
Chart type for this series.
OptionalnameDisplay name for this series (used in legends/descriptions).
OptionalstepThis series' step convention, when it is a step or an area drawn as one.
Declared per layer because a composed chart is where one curve is a staircase and another is not; falls back to the chart-wide RechartsAdapterConfig.stepDirection when this layer says nothing.
A single data series/layer configuration for composed charts. Use this when a chart has multiple series of different types.