1 files changed, 4 insertions, 3 deletions

diff --git a/server/helpers/custom-validators/misc.ts b/server/helpers/custom-validators/misc.ts
index effdd98cb..229e9f03c 100644
--- a/server/helpers/custom-validators/misc.ts
+++ b/server/helpers/custom-validators/misc.ts
@@ -1,6 +1,7 @@
 import 'multer'
-import validator from 'validator'
+import { UploadFilesForCheck } from 'express'
 import { sep } from 'path'
+import validator from 'validator'
 
 function exists (value: any) {
   return value !== undefined && value !== null
@@ -13,7 +14,7 @@ function isSafePath (p: string) {
     })
 }
 
-function isArray (value: any) {
+function isArray (value: any): value is any[] {
   return Array.isArray(value)
 }
 
@@ -108,7 +109,7 @@ function isFileFieldValid (
 }
 
 function isFileMimeTypeValid (
-  files: { [ fieldname: string ]: Express.Multer.File[] } | Express.Multer.File[],
+  files: UploadFilesForCheck,
   mimeTypeRegex: string,
   field: string,
   optional = false