// src/lib/asyncHandler.ts
import type { Request, Response, NextFunction, RequestHandler } from 'express';

/**
 * Wraps an async Express handler so any thrown error / rejected promise
 * is forwarded to `next()` (and thus to our centralized error middleware).
 */
export function asyncHandler<
    Req extends Request = Request,
    Res extends Response = Response,
>(fn: (req: Req, res: Res, next: NextFunction) => Promise<unknown>): RequestHandler {
    return (req, res, next) => {
        Promise.resolve(fn(req as Req, res as Res, next)).catch(next);
    };
}