import { RowData } from '../helper';
export interface KdeOptions {
    fields: string[];
    minSize?: number;
    as?: [string, string, string];
    extent?: [number, number];
    method?: string | ((value: any) => number);
    bandwidth?: 'silverman' | 'nrd' | ((rows: RowData[]) => number) | number;
    groupBy?: string[];
}
export declare function kde(rows: RowData[], options: KdeOptions): RowData[];