import type { QueryProps } from '../../shared/types';
import type { MetricData } from '../types';
/**
 * Hook for fetching chart data with optimized caching to reduce server load
 * @template T The data type to be returned from the API
 * @template TransformReturnType The type after transformation
 */
export declare const useChartData: <T = MetricData[], TransformReturnType = T>(url: string, query: QueryProps, transform?: (data: T) => TransformReturnType) => {
    data: T | TransformReturnType | undefined;
    error: import("../../api").ApiErrorResponse | undefined;
    loading: boolean;
    isEmpty: boolean;
    refresh: () => Promise<any>;
    lastRefreshed: Date | undefined;
};