Files should be an empty array by default

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tp/helpers",
-  "version": "2.3.1",
+  "version": "2.3.2",
   "description": "",
   "main": "closest.js",
   "scripts": {

upload-files.js

@@ -8,7 +8,7 @@ export const upload = function(superClass) {
      * @param {Object} opts Upload options
      * @returns Promise
      */
-    uploadFiles(url, files, data = {}) {
+    uploadFiles(url, files = [], data = {}) {
       return new Promise((resolve, reject) => {
         const request = new XMLHttpRequest();
         const formData = new FormData();