import type { LinePoint, LineChartOptions } from '../../../../types/portal.js';
/**
 * Build a responsive SVG line chart for one or two series.
 * When a second series is passed via options it is drawn with a dashed line.
 * Returns empty string when points array is empty.
 */
export declare function buildSvgLineChart(points: LinePoint[], options?: LineChartOptions): string;
/**
 * Build a dual-series SVG line chart (real vs ideal).
 * Returns empty string when either series is empty.
 */
export declare function buildSvgDualLineChart(series1: LinePoint[], series2: LinePoint[], options?: LineChartOptions & {
    label1?: string;
    label2?: string;
}): string;
//# sourceMappingURL=line-chart.d.ts.map