import type { D3SymbolName } from '../../labels';
import type { DataSeries, Point } from '..';
export declare const get_series_color: (series_idx: number) => string;
export declare const get_series_symbol: (series_idx: number) => D3SymbolName;
export declare const extract_series_color: (series_data: DataSeries) => string;
export declare const prepare_legend_data: (series: DataSeries[]) => {
    series_idx: number;
    label: string;
    visible: boolean;
    display_style: {
        symbol_type: D3SymbolName;
        symbol_color: string;
    };
}[];
export declare const create_data_points: (series: DataSeries[], filter_fn?: (series: DataSeries) => boolean) => Point[];
export declare function process_prop<T>(prop: T[] | T | undefined | null, idx: number): T | undefined;