/**
 * Promisify utility function
 * Converts a callback-based function to a Promise-based one
 * Universal implementation that works in both Node.js and browser
 *
 * @param fn - Function that uses callback pattern (err, result) => void
 * @returns Promise-based version of the function
 */
export declare function promisify<T extends (...args: unknown[]) => unknown>(fn: T): (...args: Parameters<T>) => Promise<unknown>;