Remove "defineConfig" (seems to be optional)

frontend/vite.config.ts

@@ -1,5 +1,5 @@
 import { createHtmlPlugin } from 'vite-plugin-html'
-import { defineConfig, loadEnv } from 'vite'
+import { loadEnv } from 'vite'
 import Components from 'unplugin-vue-components/vite'
 import Icons from 'unplugin-icons/vite'
 import IconsResolver from 'unplugin-icons/resolver'
@@ -8,7 +8,7 @@ import typescript2 from "rollup-plugin-typescript2"
 import vue from '@vitejs/plugin-vue'
 
 // https://vitejs.dev/config/
-export default defineConfig(({ command, mode }) => {
+export default (({ command, mode }) => {
   // Load env file based on `mode` https://vitejs.dev/config/#environment-variables
   const env = loadEnv(mode, process.cwd(), '')