Alluvial flow

'chart-types-alluvial': () => ({
  rows: [], config: {},
  foot: ['region on the left, status on the right', 'each ribbon is charge moving between them'],
  mount: mountGridCharts({
    rows: circuits(2_000), columns: chartCols, columnsPer: 1, chartHeight: 360,
    chartTypeModules: ['alluvial'],
    charts: [{ type: 'alluvial', source: 'region', target: 'status', value: 'charge', title: 'Charge from region to status' }],
  }),
}),