import type { DataRecord, TransformArg } from '../types.js';
export type BollingerOptions = {
    /**
     * the window size (the window transform’s k option), an integer; defaults to 20
     */
    n?: number;
    /**
     * the band radius, a number representing a multiple of standard deviations; defaults to 2
     */
    k?: number;
};
export declare function bollingerX(args: TransformArg<DataRecord>, options?: BollingerOptions): TransformArg<DataRecord>;
export declare function bollingerY(args: TransformArg<DataRecord>, options?: BollingerOptions): TransformArg<DataRecord>;
export declare function bollingerDim(dim: 'x' | 'y', { data, ...channels }: TransformArg<DataRecord>, options?: BollingerOptions): {
    data: {
        __x: import("../types.js").RawValue;
        __lo: number;
        __avg: number;
        __hi: number;
    }[];
};