combineHandlers.ts

import { RequestHandler } from 'express';

/**
 * Combine multiple middleware together.
 * @param mids
 */
export const combineHandlers = (...mids: RequestHandler[]): RequestHandler =>
  mids.reduce((a, b) => (req, res, next) => {
    a(req, res, err => {
      if (err) {
        return next(err);
      }
      b(req, res, next);
    });
  });