diff --git a/lib/web/auth/gitlab/index.js b/lib/web/auth/gitlab/index.js
deleted file mode 100644
index 1b628e815..000000000
--- a/lib/web/auth/gitlab/index.js
+++ /dev/null
@@ -1,35 +0,0 @@
-'use strict'
-
-const Router = require('express').Router
-const passport = require('passport')
-const GitlabStrategy = require('passport-gitlab2').Strategy
-const config = require('../../../config')
-const response = require('../../../response')
-const { passportGeneralCallback } = require('../utils')
-
-let gitlabAuth = module.exports = Router()
-
-passport.use(new GitlabStrategy({
-  baseURL: config.gitlab.baseURL,
-  clientID: config.gitlab.clientID,
-  clientSecret: config.gitlab.clientSecret,
-  scope: config.gitlab.scope,
-  callbackURL: config.serverURL + '/auth/gitlab/callback'
-}, passportGeneralCallback))
-
-gitlabAuth.get('/auth/gitlab', function (req, res, next) {
-  passport.authenticate('gitlab')(req, res, next)
-})
-
-// gitlab auth callback
-gitlabAuth.get('/auth/gitlab/callback',
-  passport.authenticate('gitlab', {
-    successReturnToOrRedirect: config.serverURL + '/',
-    failureRedirect: config.serverURL + '/'
-  })
-)
-
-if (!config.gitlab.scope || config.gitlab.scope === 'api') {
-  // gitlab callback actions
-  gitlabAuth.get('/auth/gitlab/callback/:noteId/:action', response.gitlabActions)
-}
diff --git a/lib/web/auth/gitlab/index.ts b/lib/web/auth/gitlab/index.ts
new file mode 100644
index 000000000..adeec8ebe
--- /dev/null
+++ b/lib/web/auth/gitlab/index.ts
@@ -0,0 +1,41 @@
+import { Router } from 'express'
+import passport from 'passport'
+import { Strategy as GitlabStrategy } from 'passport-gitlab2'
+import { config } from '../../../config'
+import { response } from '../../../response'
+import { AuthMiddleware } from '../interface'
+import { passportGeneralCallback } from '../utils'
+
+export const GitlabMiddleware: AuthMiddleware =
+  {
+    getMiddleware (): Router {
+      const gitlabAuth = module.exports = Router()
+
+      passport.use(new GitlabStrategy({
+        baseURL: config.gitlab.baseURL,
+        clientID: config.gitlab.clientID,
+        clientSecret: config.gitlab.clientSecret,
+        scope: config.gitlab.scope,
+        callbackURL: config.serverURL + '/auth/gitlab/callback'
+      }, passportGeneralCallback))
+
+      gitlabAuth.get('/auth/gitlab', function (req, res, next) {
+        passport.authenticate('gitlab')(req, res, next)
+      })
+
+      // gitlab auth callback
+      gitlabAuth.get('/auth/gitlab/callback',
+        passport.authenticate('gitlab', {
+          successReturnToOrRedirect: config.serverURL + '/',
+          failureRedirect: config.serverURL + '/'
+        })
+      )
+
+      if (!config.gitlab.scope || config.gitlab.scope === 'api'
+      ) {
+        // gitlab callback actions
+        gitlabAuth.get('/auth/gitlab/callback/:noteId/:action', response.gitlabActions)
+      }
+      return gitlabAuth
+    }
+  }