/**
 * Web Search Engine Manager - v0.10.0
 * Supports multiple search backends with automatic fallback.
 * Default: DuckDuckGo (free, no API key required).
 */
export interface SearchResult {
    title: string;
    url: string;
    snippet: string;
}
export interface SearchOptions {
    maxResults?: number;
    engine?: SearchEngine;
}
export type SearchEngine = 'duckduckgo' | 'brave' | 'searxng' | 'google';
export interface SearchEngineConfig {
    enabled: boolean;
    apiKey?: string;
    baseUrl?: string;
}
export interface WebSearchConfig {
    defaultEngine: SearchEngine;
    enabled: boolean;
    engines: Partial<Record<SearchEngine, SearchEngineConfig>>;
}
export declare const DEFAULT_SEARCH_CONFIG: WebSearchConfig;
/**
 * Parse DuckDuckGo HTML search results.
 */
export declare function parseDuckDuckGoHTML(html: string): SearchResult[];
/**
 * Search using DuckDuckGo HTML interface (no API key needed).
 */
export declare function searchDuckDuckGo(query: string, maxResults?: number): Promise<SearchResult[]>;
/**
 * Search using Brave Search API.
 */
export declare function searchBrave(query: string, apiKey: string, maxResults?: number): Promise<SearchResult[]>;
/**
 * Search using SearXNG instance.
 */
export declare function searchSearXNG(query: string, baseUrl: string, maxResults?: number): Promise<SearchResult[]>;
/**
 * Search using Google Custom Search API.
 */
export declare function searchGoogle(query: string, apiKey: string, maxResults?: number): Promise<SearchResult[]>;
/**
 * Unified search function with fallback.
 */
export declare function webSearch(query: string, config?: WebSearchConfig, options?: SearchOptions): Promise<SearchResult[]>;
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