/**
 * AsyncWrapper
 *
 * Unified error handling
 * Automatically wraps async handlers to catch Promise rejections
 */
import { RequestHandler } from '../types/index';
/**
 * Wrap async handler to automatically catch errors
 *
 * @param fn - Async handler function
 * @returns Wrapped handler
 *
 * @example
 * ```typescript
 * app.get('/users/:id', asyncWrapper(async (req, res) => {
 *   const user = await db.findUser(req.params.id) // Error can occur
 *   res.json(user)
 * }))
 * ```
 *
 * @example
 * ```typescript
 * // No try-catch needed!
 * app.get('/users/:id', async (req, res) => {
 *   const user = await db.findUser(req.params.id)
 *   res.json(user)
 * })
 * ```
 */
export declare function asyncWrapper(fn: RequestHandler): RequestHandler;
/**
 * Check if handler is an async function
 */
export declare function isAsyncFunction(fn: Function): boolean;
/**
 * Check if handler returns a Promise
 */
export declare function returnsPromise(fn: Function, ...args: any[]): boolean;
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