/**
 * File utility functions for storage operations
 * @module utils/fileUtils
 */
/**
 * Convert file parameter to Buffer
 * Handles Buffer, ReadableStream, or throws error
 *
 * @param file - File data (Buffer or stream)
 * @param streamConverter - Optional function to convert stream to buffer
 * @returns Buffer
 */
export declare function convertFileToBuffer(file: Buffer | globalThis.NodeJS.ReadableStream | null | undefined, streamConverter?: (stream: globalThis.NodeJS.ReadableStream) => Promise<Buffer>): Promise<Buffer>;
/**
 * Extract filename from file key/path
 * Returns the last segment after splitting by '/'
 *
 * @param key - File key or path
 * @returns Filename
 */
export declare function extractFilenameFromKey(key: string): string;