import type { WebSearchRequest, WebSearchResult } from '@deepseek-ai/dsh-web';
import type { SearchBackend, SearxngConfig } from './types.ts';
/** SearXNG backend using a configured instance's keyless JSON endpoint. */
export declare class SearxngBackend implements SearchBackend {
    private readonly config;
    private readonly requestTimeoutMs;
    readonly id = "lemoncat7-search";
    readonly kind = "searxng";
    constructor(config: Required<Pick<SearxngConfig, 'baseURL' | 'language' | 'safeSearch'>> & SearxngConfig, requestTimeoutMs?: number);
    available(): boolean;
    search(request: WebSearchRequest, signal?: AbortSignal): Promise<WebSearchResult>;
    private searchOnce;
}
export interface SearxngEngineProbe {
    readonly name: string;
    readonly categories: readonly string[];
    readonly enabledByDefault: boolean;
    readonly tested: boolean;
    readonly available: boolean;
    readonly resultCount: number;
    readonly truncated: boolean;
    readonly durationMs: number;
    readonly error?: string;
}
/** Read general-purpose engines from one instance and probe them with bounded concurrency. */
export declare function discoverSearxngEngines(config: Required<Pick<SearxngConfig, 'baseURL' | 'language' | 'safeSearch'>> & SearxngConfig, query?: string, concurrency?: number): Promise<SearxngEngineProbe[]>;
/** Resolve the configured instance root to its search endpoint. */
export declare function endpointFor(baseURL: string): string | undefined;