constness

src/routes/mail.js

@@ -307,7 +307,7 @@ async function updateList(req, res, next) {
     if (!Array.isArray(req.body.members)) return next(new HttpError(400, 'members must be a string'));
     if (req.body.members.length === 0) return next(new HttpError(400, 'list must have atleast one member'));
 
-    for (var i = 0; i < req.body.members.length; i++) {
+    for (let i = 0; i < req.body.members.length; i++) {
         if (typeof req.body.members[i] !== 'string') return next(new HttpError(400, 'member must be a string'));
     }
     if (typeof req.body.membersOnly !== 'boolean') return next(new HttpError(400, 'membersOnly must be a boolean'));