import type { FlowLink, FlowNode } from '../types';
export interface SankeyLayoutNode {
    id: string;
    label: string;
    x: number;
    y: number;
    width: number;
    height: number;
}
export interface SankeyLayoutLink {
    source: SankeyLayoutNode;
    target: SankeyLayoutNode;
    value: number;
    path: string;
}
export declare function layoutSankey(nodes: FlowNode[], links: FlowLink[], width: number, height: number, nodeWidth?: number): {
    nodes: SankeyLayoutNode[];
    links: SankeyLayoutLink[];
};
export declare function chordPath(cx: number, cy: number, r: number, startAngle: number, endAngle: number): string;
export interface ChordSegment {
    index: number;
    startAngle: number;
    endAngle: number;
    value: number;
}
export interface ChordRibbon {
    source: number;
    target: number;
    value: number;
    path: string;
}
export interface ChordLayout {
    cx: number;
    cy: number;
    outerR: number;
    innerR: number;
    segments: ChordSegment[];
    ribbons: ChordRibbon[];
}
/** Layout a chord diagram from an adjacency matrix. */
export declare function layoutChord(matrix: number[][], size: number, padAngle?: number): ChordLayout;
/** Filled ribbon between two arc spans on a chord diagram. */
export declare function chordRibbonPath(cx: number, cy: number, outerR: number, _innerR: number, sa1: number, ea1: number, sa2: number, ea2: number): string;