/**
 * Simple API function for downloading tracks.
 * @param artist - Artist name
 * @param title - Track title
 * @param folderName - Optional subfolder name within SOULSEEK_DOWNLOAD_DIR
 * @param customFileName - Optional custom filename (without extension)
 * @returns Path to downloaded file or null if failed
 *
 * @example
 * ```typescript
 * import { soulseekDownload } from 'andrader-soulseek-downloader';
 *
 * // Basic usage
 * const filePath = await soulseekDownload('Daft Punk', 'One More Time');
 *
 * // With custom folder
 * const filePath2 = await soulseekDownload('Daft Punk', 'One More Time', 'Electronic');
 *
 * // With custom folder and filename
 * const filePath3 = await soulseekDownload('Daft Punk', 'One More Time', 'Electronic', 'daft_punk_one_more_time');
 * ```
 */
export declare function soulseekDownload(artist: string, title: string, folderName?: string, customFileName?: string): Promise<string | null>;
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