Function appendData

src/core/createRenderCoordinator.ts:3208–3236

(seriesIndex, newPoints)

  };

  const appendData: RenderCoordinator['appendData'] = (seriesIndex, newPoints) => {
    assertNotDisposed();
    if (!Number.isFinite(seriesIndex)) return;
    if (seriesIndex < 0 || seriesIndex >= currentOptions.series.length) return;
    if (!newPoints || newPoints.length === 0) return;

    const s = currentOptions.series[seriesIndex]!;
    if (s.type === 'pie') {
      // Pie series are non-cartesian and currently not supported by streaming append.
      if (!warnedPieAppendSeries.has(seriesIndex)) {
        warnedPieAppendSeries.add(seriesIndex);
        console.warn(
          `RenderCoordinator.appendData(${seriesIndex}, ...): pie series are not supported by streaming append.`
        );
      }
      return;
    }

    const existing = pendingAppendByIndex.get(seriesIndex);
    if (existing) {
      existing.push(...(newPoints as Array<DataPoint | OHLCDataPoint>));
    } else {
      // Copy into a mutable staging array so repeated appends coalesce without extra allocations.
      pendingAppendByIndex.set(seriesIndex, Array.from(newPoints as Array<DataPoint | OHLCDataPoint>));
    }

    // Coalesce appends + any required resampling + GPU streaming updates into a single flush.
    scheduleFlush();
  };

  const shouldRenderArea = (series: ResolvedChartGPUOptions['series'][number]): boolean => {
    switch (series.type) {