import type { FetchFn, SearchBackend, SearchResult } from './types.js';
export interface ExaBackendOptions {
    apiKey: string;
    fetchFn?: FetchFn;
}
export declare function createExaSearchBackend(opts: ExaBackendOptions): SearchBackend;
export interface ResolveSearchOptions {
    exaApiKey?: string | undefined;
    fetchFn?: FetchFn;
}
export declare function resolveSearchBackend(opts: ResolveSearchOptions): SearchBackend | {
    error: string;
};
export declare function formatSearchResults(query: string, results: SearchResult[]): string;