Express Async Handler Wrapper to Prevent Unhandled Promise Rejections

wrap.js

/**
 * @template {(...args: any[]) => Promise<any>} T
 * @param {T} fn
 * @returns {(...args: Parameters<T>) => Promise<ReturnType<T>|void>}
 */
export const wrap = (fn) => (...args) => fn(...args).catch(args[2]);

wrap.ts

import type {
  NextFunction,
  Request,
  RequestHandler,
  Response,
} from 'express';

/**
 * Wrap an async function and call next(err) if the Promise rejects.
 * @see https://strongloop.com/strongblog/async-error-handling-expressjs-es7-promises-generators/#using-es7-asyncawait
 */
export function wrap(handler: RequestHandler): RequestHandler {
  return (req: Request, res: Response, next: NextFunction) => handler(req, res, next).catch(next);
}