import { type DataViewFacade } from "@gooddata/sdk-ui";
import { type IUnwrappedAttributeHeadersWithItems } from "../../typings/mess.js";
import { type ISeriesItem } from "../../typings/unsafe.js";
/**
 * Stacked Mekko executes with [[stackBy], [viewBy, MeasureGroup]], so the view-by header items
 * enumerate view × measure combinations. Downstream consumers (categories, point names, drills)
 * index them by column, so collapse to one item per view value. No-op without a measure group
 * in the view-by dimension or with fewer than two measures.
 *
 * The `index % measureCount` stride holds only because MeasureGroup is the last header in its
 * dimension (the invariant `findMeasureGroupInDimensions` enforces).
 */
export declare function collapseMekkoViewByItems(dv: DataViewFacade, viewByAttribute: IUnwrappedAttributeHeadersWithItems | undefined | null): IUnwrappedAttributeHeadersWithItems | undefined | null;
/**
 * Mekko can't stack to 100% with negative Height values (percent of mixed-sign segments is
 * undefined) — it falls back to absolute stacking. Evaluated once in getChartOptions and exposed
 * as chartOptions.stackToPercentBlockedByNegativeValues; downstream consumers (stacking config,
 * ChartTransformation) read that flag rather than re-deriving it.
 */
export declare function isMekkoPercentBlockedByNegatives(type: string | undefined, series: ISeriesItem[] | undefined): boolean;
/**
 * Drops Mekko columns whose Width (point.z) is 0 — from every series' data and the categories in
 * lockstep. Negative z is kept so validateData can reject it. The first series drives the mask (all
 * series share the same z per column); inputs are returned unchanged when nothing is dropped.
 */
export declare function dropZeroWidthMekkoColumns<TCategory>(series: ISeriesItem[], categories: TCategory[]): {
    series: ISeriesItem[];
    categories: TCategory[];
};
//# sourceMappingURL=mekkoChartOptions.d.ts.map