/**
 * Calculated-field chart series: evaluate a spreadsheet formula per category over the **aggregated**
 * measure values (aggregate-then-evaluate — the ratio-of-totals a user expects; see
 * plans/chart-calculated-fields-spec.md). Pure: it drives the (DOM-free) formula engine, so it is
 * unit-tested directly. References are A1, where the letters map to the numeric columns in display
 * order (`A1` = first numeric column, row is always 1 — one aggregated value per column per category).
 */
import type { CalculatedField } from './chart.js';
/** Whether `formula` parses (parse-only; does not evaluate). Drives the editor's live validation. */
export declare function isValidChartFormula(formula: string): boolean;
/**
 * Compute each {@link CalculatedField} as a series. `refAggregates[letterColIndex][categorySlot]` is
 * the aggregated value of the numeric column mapped to that letter (A = index 0) for that category.
 * Evaluated once per category (aggregate-then-evaluate). An unparseable formula is skipped entirely;
 * an error or non-finite result for a category becomes `null` (a gap) rather than a misleading zero.
 */
export declare function computeCalculatedSeries(fields: readonly CalculatedField[], refAggregates: readonly number[][], categoryCount: number): {
    name: string;
    data: (number | null)[];
}[];