import { ChartData, Point, MultiChartData } from '../types';
/**
 * Validates a Point object
 * @param point The point to validate
 * @returns Error message if invalid, null if valid
 */
export declare function validatePoint(point: Point): string | null;
/**
 * Validates an array of Points
 * @param points The points array to validate
 * @returns Error message if invalid, null if valid
 */
export declare function validatePoints(points: Point[]): string | null;
/**
 * Validates house cusps array
 * @param houseCusps The house cusps to validate
 * @returns Error message if invalid, null if valid
 */
export declare function validateHouseCusps(houseCusps: number[] | undefined): string | null;
/**
 * Validates a ChartData object
 * @param chartData The chart data to validate
 * @returns Error message if invalid, null if valid
 */
export declare function validateChartData(chartData: ChartData): string | null;
/**
 * Validates MultiChartData
 * @param multiChartData The multi-chart data to validate
 * @returns Error message if invalid, null if valid
 */
export declare function validateMultiChartData(multiChartData: MultiChartData): string | null;
/**
 * Validates chart data (single or multi-chart)
 * @param data The data to validate
 * @returns Error message if invalid, null if valid
 */
export declare function validateInputData(data: ChartData | MultiChartData): string | null;