import type { Dict } from '@visactor/vchart';
import type { BarLinkAttrs, BarLinkDatum } from './type';
import type { IMarkGraphic, ISpec } from '@visactor/vchart';
export declare function groupBarsByFields(elements: IMarkGraphic[], groupFields: string[]): Dict<IMarkGraphic[]>;
export declare function getLinkData(currentElement: IMarkGraphic, nextElement: IMarkGraphic, config: {
    isHorizontal: boolean;
    isXAxisInverse: boolean;
    isYAxisInverse: boolean;
    linkType: string;
    doFill: boolean;
    regionStartX: number;
    regionStartY: number;
}): BarLinkDatum;
export declare function getBarLinkConfig(style?: Pick<BarLinkAttrs, 'areaStyle' | 'label' | 'linkStyle' | 'styleMap' | 'doFill' | 'linkType'>, extraStyle?: any): {
    type: string;
    componentType: string;
    zIndex: number;
    interactive: boolean;
    style: any;
};
export declare function appendBarLinkConfig(rawSpec: ISpec, barLinkSpec?: Pick<BarLinkAttrs, 'areaStyle' | 'label' | 'linkStyle' | 'styleMap' | 'doFill' | 'linkType'>): void;