import { Scale } from 'vega';
import { NestField } from '../../data_tree';
export declare const MEASURE_SERIES_LABEL_SCALE = "measureSeriesLabel";
/**
 * Maps the measure-series legend's domain (raw measure field names) to each
 * field's `# label`. Labels live in scale data so they render verbatim: an
 * explicit `# label=""` deliberately shows a blank legend entry, the same
 * way it hides an axis title. Domain and range dedupe in lockstep because
 * d3 dedupes an ordinal scale's domain but not its range; a repeated y
 * measure would otherwise shift later labels onto the wrong measure.
 */
export declare function getMeasureSeriesLabelScale(explore: NestField, yFieldPaths: string[]): Scale;