refactor: use strict typing

apps/server/src/api-data/sheets/sheets.controller.ts

@@ -25,10 +25,11 @@ export async function requestConnection(
   res: Response<{ verification_url: string; user_code: string } | ErrorResponse>,
 ) {
   const { sheetId } = req.params;
-  const file = req.file.path;
+  // the check for the file is done in the validation middleware
+  const filePath = (req.file as Express.Multer.File).path;
 
   try {
-    const client = readFileSync(file, 'utf-8');
+    const client = readFileSync(filePath, 'utf-8');
     const clientSecret = handleClientSecret(client);
     const { verification_url, user_code } = await handleInitialConnection(clientSecret, sheetId);
 
@@ -40,7 +41,7 @@ export async function requestConnection(
 
   // delete uploaded file after parsing
   try {
-    deleteFile(file);
+    await deleteFile(filePath);
   } catch (_error) {
     /** we dont handle failure here */
   }