/**
 * Sparkline path maths, kept separate from the component so it can be tested in
 * the node project without a browser.
 *
 * This consolidates six divergent implementations that disagreed on
 * normalisation, flat-series handling and stroke inset. `normalize` makes the
 * first of those an explicit caller decision rather than an accident.
 */
export type SparklineNormalize = 'minMax' | 'zeroMax';
export interface SparklineGeometryOptions {
    width: number;
    height: number;
    strokeWidth: number;
    normalize: SparklineNormalize;
}
export interface SparklineGeometry {
    /** SVG path `d` for the line. Empty string when there is no data. */
    line: string;
    /** SVG path `d` for the filled area, closed to the baseline. */
    area: string;
    /** Last plotted point, for the optional end marker. */
    endPoint: {
        x: number;
        y: number;
    } | null;
}
export declare function buildSparklinePath(values: readonly number[], { width, height, strokeWidth, normalize }: SparklineGeometryOptions): SparklineGeometry;