grafana/packages/grafana-ui/src/components/Sparkline/utils.ts

import { DataFrame, FieldConfig, FieldSparkline, IndexVector } from '@grafana/data';
import { GraphFieldConfig } from '@grafana/schema';

import { applyNullInsertThreshold } from '../GraphNG/nullInsertThreshold';

/** @internal
 * Given a sparkline config returns a DataFrame ready to be turned into Plot data set
 **/
export function preparePlotFrame(sparkline: FieldSparkline, config?: FieldConfig<GraphFieldConfig>): DataFrame {
  const length = sparkline.y.values.length;
  const yFieldConfig = {
    ...sparkline.y.config,
    ...config,
  };

  return applyNullInsertThreshold({
    frame: {
      refId: 'sparkline',
      fields: [
        sparkline.x ?? IndexVector.newField(length),
        {
          ...sparkline.y,
          config: yFieldConfig,
        },
      ],
      length,
    },
  });
}