The selectors for the marks Nivo stamps itself, built from the props alone.
A single bar series names each bar, one entry per payload point.
A stacked or grouped chart names each cell, [series][category], null
where Nivo drew no bar.
A pie names its arcs in one selector list, which resolves in document
order — data order — and so is emitted only while that is the order the
slices are laid out in.
A heat map names each cell; the grid runs bottom row first, the reverse of
data.points, which is how Heatmap indexes it.
The selectors for the marks Nivo stamps itself, built from the props alone.
[series][category],nullwhere Nivo drew no bar.data.points, which is howHeatmapindexes it.