import { DomainXValue } from "../common/Types.js";
import { XYDatumEx } from "./commonXY.js";
/**
 * Generates gradient definitions for series.
 */
export declare function useGradientDefs<X extends DomainXValue, Data>(data: XYDatumEx<X, Data>[] | undefined, required: boolean): import("@emotion/react/types/jsx-namespace").EmotionJSX.Element[] | null;