From 203dc47b0f82befe2e931e23ff4b58b1573743cc Mon Sep 17 00:00:00 2001
From: Antoine du Hamel <duhamelantoine1995@gmail.com>
Date: Fri, 23 Jun 2023 17:15:25 +0200
Subject: [PATCH] @uppy/companion: fix part listing in s3

Attempting to list a multipart upload with 0 uploaded parts would return
an empty array with AWS SDK v2, and returns `undefined` with AWS SDK v3.
---
 .../@uppy/companion/src/server/controllers/s3.js     | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/packages/@uppy/companion/src/server/controllers/s3.js b/packages/@uppy/companion/src/server/controllers/s3.js
index 93b3f43626..283e56e958 100644
--- a/packages/@uppy/companion/src/server/controllers/s3.js
+++ b/packages/@uppy/companion/src/server/controllers/s3.js
@@ -159,7 +159,7 @@ module.exports = function s3 (config) {
       return
     }
 
-    let parts = []
+    const parts = []
 
     function listPartsPage (startAt) {
       client.send(new ListPartsCommand({
@@ -167,18 +167,18 @@ module.exports = function s3 (config) {
         Key: key,
         UploadId: uploadId,
         PartNumberMarker: startAt,
-      })).then(data => {
-        parts = parts.concat(data.Parts)
+      })).then(({ Parts, IsTruncated, NextPartNumberMarker }) => {
+        if (Parts) parts.push(...Parts)
 
-        if (data.IsTruncated) {
+        if (IsTruncated) {
           // Get the next page.
-          listPartsPage(data.NextPartNumberMarker)
+          listPartsPage(NextPartNumberMarker)
         } else {
           res.json(parts)
         }
       }, next)
     }
-    listPartsPage(0)
+    listPartsPage()
   }
 
   /**