update

handler.js

+import { handler } from "./build/handler.js";
+import express from "express";
+
+const app = express();
+app.get("/static/*", express.static("static"));
+app.use(handler);
+
+app.listen(3000, () => {
+	console.log("Server started on http://localhost:3000");
+});

src/staticFileServer.ts

-import express from "express";
-import type { Plugin } from "vite";
-
-const assets = express.static("static");
-
-const configureServer = (server=>{
-	server.middlewares.use(assets as any);
-	console.log(__dirname);
-}) as Plugin["configureServer"];
-
-export const staticFileServer = ()=>({
-	name: "StaticFileServer",
-	configureServer,
-	configurePreviewServer: configureServer,
-}) as Plugin;

vite.config.ts

 import { sveltekit } from '@sveltejs/kit/vite';
 import { defineConfig } from 'vite';
-import { staticFileServer } from './src/staticFileServer';
 
 export default defineConfig({
-	plugins: [
-		sveltekit(),
-		staticFileServer(),
-	],
+	plugins: [sveltekit()]
 });