import { HttpClient } from '@sisense/sdk-rest-client';
import { WidgetProps } from '../../domains/widgets/components/widget/types';
/**
 * Pure function that fetches NLG insights from WidgetProps.
 *
 * This function converts WidgetProps to the required API format and makes an HTTP request
 * to get natural language insights about the chart or pivot data.
 *
 * @param props - WidgetProps containing chart or pivot configuration (`config.narrative`
 *   drives {@link WidgetNarrativeConfig})
 * @param httpClient - HttpClient instance for making API requests
 * @returns Promise that resolves to the NLG insights answer string
 * @throws Error if dataSource cannot be resolved or if API response is invalid
 * @example
 * ```typescript
 * import { getNlgInsightsFromWidget } from '@sisense/sdk-ui/ai';
 * import { HttpClient } from '@sisense/sdk-rest-client';
 *
 * const widgetProps: WidgetProps = {
 *   chartType: 'bar',
 *   dataOptions: { category: [...], value: [...] },
 *   dataSource: 'Sample ECommerce',
 *   filters: [...],
 * };
 *
 * const httpClient = new HttpClient(url, auth, env);
 *
 * const insights = await getNlgInsightsFromWidget(widgetProps, httpClient);
 * ```
 * @internal
 */
export declare function getNlgInsightsFromWidget(props: WidgetProps, httpClient: HttpClient): Promise<string>;