import type { GenericMarkOptions, Mark, RawValue } from '../types.js';
/**
 * This function tracks which facets are "empty", meaning that they don't contain
 * any "facetted" data points. This can happen when fx and fy are combined and
 * certain combinations don't yield results.
 *
 * @param marks
 * @param fxValues x facet domain
 * @param fyValues y facet domain
 * @returns
 */
export declare function getEmptyFacets(marks: Mark<GenericMarkOptions>[], fxValues: RawValue[], fyValues: RawValue[]): Map<RawValue, Map<RawValue, boolean>>;