/**
 * Open Library API Integration
 *
 * Stage 2 of the entity resolution pipeline.
 * Searches Open Library for books by title/author, filters for valid physical formats.
 */
import type { ResponseCache } from '../caching/types';
import type { FetchFn } from '../scraper/types';
import type { OpenLibraryResult } from './types';
/**
 * Configuration for Open Library search.
 */
export interface OpenLibrarySearchConfig {
    /** Response cache for API calls */
    cache?: ResponseCache | undefined;
    /** User agent for API requests */
    userAgent?: string | undefined;
    /** Request timeout in milliseconds */
    timeout?: number | undefined;
    /** Custom fetch function (for testing) */
    customFetch?: FetchFn | undefined;
}
/**
 * Search Open Library for a book by title and optionally author.
 *
 * @param title - Book title to search for
 * @param author - Optional author name (improves search accuracy)
 * @param config - Search configuration
 * @returns OpenLibraryResult if found, null otherwise
 */
export declare function searchOpenLibrary(title: string, author: string | undefined, config?: OpenLibrarySearchConfig): Promise<OpenLibraryResult | null>;
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