/**
 * Custom stepladder curve generator for d3-line
 */
declare class StepCustom {
    _ctx: CanvasRenderingContext2D;
    _line: boolean;
    _x: number;
    _y: number;
    constructor(ctx: CanvasRenderingContext2D);
    areaStart(): void;
    areaEnd(): void;
    lineStart(): void;
    lineEnd(): void;
    point(x: number, y: number): void;
}
export default function stepCustom(ctx: any): StepCustom;
export {};