1 files changed, 5 insertions, 2 deletions

diff --git a/server/middlewares/async.ts b/server/middlewares/async.ts
index 9692f9be7..534891899 100644
--- a/server/middlewares/async.ts
+++ b/server/middlewares/async.ts
@@ -1,9 +1,12 @@
-import { Request, Response, NextFunction, RequestHandler } from 'express'
 import { eachSeries } from 'async'
+import { NextFunction, Request, RequestHandler, Response } from 'express'
 
 // Syntactic sugar to avoid try/catch in express controllers
 // Thanks: https://medium.com/@Abazhenov/using-async-await-in-express-with-node-8-b8af872c0016
-function asyncMiddleware (fun: RequestHandler | RequestHandler[]) {
+
+export type RequestPromiseHandler = (req: Request, res: Response, next: NextFunction) => Promise<any>
+
+function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) {
   return (req: Request, res: Response, next: NextFunction) => {
     if (Array.isArray(fun) === true) {
       return eachSeries(fun as RequestHandler[], (f, cb) => {