Upgrade eslint and vite.

eslint.config.js

@@ -0,0 +1,42 @@
+import js from "@eslint/js";
+import unoConfig from "@unocss/eslint-config/flat";
+import { defineConfig } from "eslint/config";
+import prettierRecommended from "eslint-plugin-prettier/recommended";
+import vue from "eslint-plugin-vue";
+import globals from "globals";
+
+export default defineConfig([
+    {
+        ignores: ["**/.*", "node_modules/**", "dist/**", "dist-ci/**"],
+    },
+    {
+        files: ["**/*.{js,mjs,cjs,vue}"],
+        languageOptions: {
+            ecmaVersion: "latest",
+            sourceType: "module",
+            globals: {
+                ...globals.browser,
+                ...globals.node,
+            },
+        },
+    },
+    {
+        ...js.configs.recommended,
+        files: ["**/*.{js,mjs,cjs,vue}"],
+    },
+    ...vue.configs["flat/recommended"],
+    {
+        ...unoConfig,
+        files: ["**/*.{js,mjs,cjs,vue}"],
+    },
+    {
+        files: ["**/*.vue"],
+        rules: {
+            "no-useless-assignment": "off",
+        },
+    },
+    {
+        ...prettierRecommended,
+        files: ["**/*.{js,mjs,cjs,vue}"],
+    },
+]);