/**
 * Springer Nature Searcher
 *
 * Documentation: https://dev.springernature.com/
 * API Endpoints:
 * - Metadata API v2: https://api.springernature.com/meta/v2/json
 * - OpenAccess API: https://api.springernature.com/openaccess/json (if available with your key)
 *
 * Required API Key: Yes (api_key parameter)
 * Get API key from: https://dev.springernature.com/signup
 *
 * Note: Meta API v2 is the primary API. OpenAccess API may require special access.
 */
import { PaperSource, SearchOptions, DownloadOptions, PlatformCapabilities } from './PaperSource.js';
import { Paper } from '../models/Paper.js';
export declare class SpringerSearcher extends PaperSource {
    private metadataClient;
    private openAccessClient;
    private rateLimiter;
    private hasOpenAccessAPI;
    private openAccessApiKey?;
    constructor(apiKey?: string, openAccessApiKey?: string);
    search(query: string, options?: SearchOptions): Promise<Paper[]>;
    private parseResult;
    downloadPdf(doi: string, options?: {
        savePath?: string;
    }): Promise<string>;
    getCapabilities(): PlatformCapabilities;
    /**
     * Test if OpenAccess API is available for this API key
     */
    private testOpenAccessAPI;
    readPaper(paperId: string, options?: DownloadOptions): Promise<string>;
}
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