Function buildChartPayload

packages/core/src/chart/index.ts:298–336

(
  rows: Record<string, unknown>[],
  rawSpec: unknown,
  options?: { truncated?: boolean }
)

}

export function buildChartPayload(
  rows: Record<string, unknown>[],
  rawSpec: unknown,
  options?: { truncated?: boolean }
): ChartPayload {
  const spec = normalizeChartSpec(rawSpec)
  const dataset = inferChartDataset(rows, spec.fields)

  const requiredFields = new Set<string>()
  for (const field of Object.values(spec.encoding)) {
    if (typeof field === 'string' && field) requiredFields.add(field)
  }
  for (const field of requiredFields) assertFieldExists(rows, field)

  let data: ChartRenderData
  switch (spec.type) {
    case 'bar':
      data = aggregateByLabel(rows, spec.encoding.x!, spec.encoding.y!)
      break
    case 'line':
      data = buildLineData(rows, spec)
      break
    case 'pie':
      data = aggregateByLabel(rows, spec.encoding.label!, spec.encoding.value!)
      break
    case 'heatmap':
      data = buildHeatmapData(rows, spec)
      break
  }

  return {
    version: 1,
    spec,
    dataset,
    data,
    rowCount: rows.length,
    truncated: options?.truncated,
  }
}