Fix syntax

client/src/utils/download.js

@@ -4,37 +4,36 @@
 /**
  * Creates a promise that resolves after the specified number of milliseconds
  */
-const delay = (milliseconds: number): Promise<void> => {
-  return new Promise((resolve) => setTimeout(resolve, milliseconds));
-};
+const delay = milliseconds => new Promise(resolve => {
+  setTimeout(resolve, milliseconds);
+});
 
 /**
  * Downloads a single file
  * @param file - An instance of the File type representing the file to download
  */
-const download = async (file: File): Promise<void> => {
+const download = async (file) => {
   const a = document.createElement('a');
   const url = URL.createObjectURL(file);
   a.download = file.name;
   a.href = url;
   a.style.display = 'none';
-  document.body.appendChild(a);
+  document.body.append(a);
   a.click();
-  await delay(100); // Needed for Chrome
+  await delay(100);  // for Chrome
   a.remove();
   URL.revokeObjectURL(url);
 };
 
 /**
- * Initiates multiple file downloads with a delay between each one
+ * Initiates multiple file downloads with a constant delay between each one
  * @param files - An array of instances of the File type representing the files to download
  */
-const multiDownload = async (files: readonly File[]): Promise<void> => {
+const multiDownload = async (files) => {
   if (!files) {
     throw new Error('`files` required');
-  }
-
-  // Trigger a download every second
+  };
+
   for (const file of files) {
     await delay(1000);
     download(file);