import type { TransformArg } from '../types.js';
export type StackOrder = 'none' | 'appearance' | 'inside-out' | 'sum';
export type StackOffset = 'none' | 'wiggle' | 'center' | 'normalize' | 'diverging';
export type StackOptions = {
    offset: null | StackOffset;
    order: null | StackOrder;
    reverse: boolean;
};
export declare function stackY<T>({ data, ...channels }: T, opts?: Partial<StackOptions>): T;
export declare function stackX({ data, ...channels }: TransformArg, opts?: Partial<StackOptions>): TransformArg;