/**
 * Utility functions
 */
/**
 * Ensure a directory exists and return its absolute path
 */
export declare function ensureDirectory(path: string): Promise<string>;
/**
 * Check if a file exists
 */
export declare function fileExists(path: string): Promise<boolean>;
/**
 * Format duration in human readable format
 */
export declare function formatDuration(ms: number): string;
/**
 * Format file size in human readable format
 */
export declare function formatFileSize(bytes: number): string;
/**
 * Retry a function with exponential backoff
 */
export declare function retry<T>(fn: () => Promise<T>, maxRetries?: number, delay?: number): Promise<T>;
/**
 * Timeout wrapper for promises
 */
export declare function withTimeout<T>(promise: Promise<T>, timeoutMs: number): Promise<T>;
/**
 * Get current timestamp in ISO format
 */
export declare function getTimestamp(): string;
/**
 * Sleep for specified milliseconds
 */
export declare function sleep(ms: number): Promise<void>;
/**
 * Validate URL format
 */
export declare function isValidUrl(url: string): boolean;
/**
 * Sanitize filename for filesystem
 */
export declare function sanitizeFilename(filename: string): string;
/**
 * Get home directory path
 */
export declare function getHomeDir(): string;
/**
 * Get temporary directory path
 */
export declare function getTempDir(): string;
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