import type { SSRInitialData } from 'c15t';
import type { FetchSSRDataOptions } from './types';
/**
 * Fetches initial consent data on the server for SSR hydration.
 *
 * @remarks
 * This is the framework-agnostic SSR data fetching function. It accepts
 * a standard Web API Headers object and performs the fetch to the c15t backend.
 *
 * Framework-specific packages (like @c15t/nextjs) wrap this function
 * with their own header resolution logic.
 *
 * **Usage in Framework Wrappers:**
 * ```ts
 * // @c15t/nextjs
 * import { headers } from 'next/headers';
 * import { fetchSSRData } from '@c15t/react/server';
 *
 * export async function fetchInitialData(options) {
 *   const nextHeaders = await headers();
 *   return fetchSSRData({ ...options, headers: nextHeaders });
 * }
 * ```
 *
 * **Direct Usage (advanced):**
 * ```ts
 * // In any framework with access to request headers
 * import { fetchSSRData } from '@c15t/react/server';
 *
 * const data = await fetchSSRData({
 *   backendURL: '/api/consent',
 *   headers: request.headers,
 *   debug: true
 * });
 * ```
 *
 * @param options - Configuration options including backendURL, headers, overrides, and debug
 * @returns The SSR initial data or undefined if the fetch fails
 *
 * @public
 */
export declare function fetchSSRData(options: FetchSSRDataOptions): Promise<SSRInitialData | undefined>;