import type { SankeyLink as D3Link, SankeyNode as D3Node } from 'd3-sankey';
import type { Orientation } from '../core/types';
import type { SankeyData, SankeyNodeAlign } from './sankey-types';
interface NodeExtra {
    node_idx: number;
    id: string | number;
    label?: string;
    color?: string;
}
interface LinkExtra {
    link_idx: number;
    color?: string;
    label?: string;
}
export type PositionedNode = D3Node<NodeExtra, LinkExtra> & {
    node_idx: number;
    id: string | number;
    x0: number;
    x1: number;
    y0: number;
    y1: number;
    value: number;
    depth: number;
};
export type PositionedLink = D3Link<NodeExtra, LinkExtra> & {
    link_idx: number;
    width: number;
    source: PositionedNode;
    target: PositionedNode;
    path: string;
    mid: {
        x: number;
        y: number;
    };
};
interface SankeyLayoutOptions {
    width: number;
    height: number;
    node_width?: number;
    node_padding?: number;
    node_align?: SankeyNodeAlign;
    orientation?: Orientation;
    iterations?: number;
}
interface SankeyLayoutResult {
    nodes: PositionedNode[];
    links: PositionedLink[];
}
export declare function sankey_from_links(source: readonly number[], target: readonly number[], value: readonly number[], labels?: readonly string[]): SankeyData;
export interface SankeyBucketOptions {
    min_fraction?: number;
    max_links?: number;
    other_label?: string;
}
export declare function bucket_sankey_data<Metadata = Record<string, unknown>>(data: SankeyData<Metadata>, { min_fraction, max_links, other_label }: SankeyBucketOptions): SankeyData<Metadata>;
export declare function compute_sankey_layout<Metadata = Record<string, unknown>>(data: SankeyData<Metadata>, opts: SankeyLayoutOptions): SankeyLayoutResult;
export {};