/**
 * Search providers with fallback support.
 * Architecture ready for future providers (Brave, Tavily, Exa, etc.).
 *
 * @module search-providers
 */
export interface SearchResult {
    title: string;
    url: string;
    snippet: string;
}
export interface SearchProvider {
    name: string;
    search(query: string, maxResults: number): Promise<SearchResult[]>;
}
/**
 * DuckDuckGo HTML search provider.
 * Scrapes the HTML endpoint - no API key required.
 */
export declare class DuckDuckGoProvider implements SearchProvider {
    name: string;
    search(query: string, maxResults: number): Promise<SearchResult[]>;
    private parseResults;
}
/**
 * SearXNG search provider.
 * Uses public SearXNG instances as fallback.
 */
export declare class SearXNGProvider implements SearchProvider {
    name: string;
    private instances;
    search(query: string, maxResults: number): Promise<SearchResult[]>;
    private parseJsonResults;
}
/**
 * Search with automatic fallback between providers.
 */
export declare function searchWeb(query: string, maxResults?: number): Promise<SearchResult[]>;
/**
 * Brave Search API provider.
 * Requires API key: BRAVE_SEARCH_API_KEY
 *
 * export class BraveSearchProvider implements SearchProvider {
 *   name = "brave";
 *   async search(query: string, maxResults: number): Promise<SearchResult[]> {
 *     const apiKey = process.env.BRAVE_SEARCH_API_KEY;
 *     if (!apiKey) throw new Error("BRAVE_SEARCH_API_KEY not set");
 *     const url = `https://api.search.brave.com/res/v1/web/search?q=${encodeURIComponent(query)}&count=${maxResults}`;
 *     const result = await fetchWithRetry(url, {
 *       headers: { "X-Subscription-Token": apiKey, Accept: "application/json" },
 *     });
 *     // Parse response...
 *   }
 * }
 */
/**
 * Tavily Search API provider.
 * Requires API key: TAVILY_API_KEY
 */
/**
 * Exa Search API provider.
 * Requires API key: EXA_API_KEY
 */
/**
 * Google Custom Search API provider.
 * Requires API key and CX: GOOGLE_SEARCH_API_KEY, GOOGLE_SEARCH_CX
 */
/**
 * Bing Search API provider.
 * Requires API key: BING_SEARCH_API_KEY
 */
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