Resolve typescript errors

src/utils/grab-db-dir.ts

@@ -1,6 +1,7 @@
 import path from "path";
 import grabDirNames from "../data/grab-dir-names";
 import type { BunSQLiteConfig } from "../types";
+import { AppData } from "../data/app-data";
 
 type Params = {
     config: BunSQLiteConfig;
@@ -15,7 +16,10 @@ export default function grabDBDir({ config }: Params) {
         db_dir = config.db_dir;
     }
 
-    const backup_dir = path.resolve(db_dir, config.db_backup_dir);
+    const backup_dir_name =
+        config.db_backup_dir || AppData["DefaultBackupDirName"];
+
+    const backup_dir = path.resolve(db_dir, backup_dir_name);
     const db_file_path = path.resolve(db_dir, config.db_name);
 
     return { db_dir, backup_dir, db_file_path };