ESLINT Upgrade to v9

frontend/eslint.config.cjs

@@ -0,0 +1,65 @@
+const { defineConfig, globalIgnores } = require("eslint/config");
+
+const tsParser = require("@typescript-eslint/parser");
+const react = require("eslint-plugin-react");
+const typescriptEslint = require("@typescript-eslint/eslint-plugin");
+const globals = require("globals");
+const js = require("@eslint/js");
+
+const { FlatCompat } = require("@eslint/eslintrc");
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+module.exports = defineConfig([
+  {
+    languageOptions: {
+      parser: tsParser,
+      ecmaVersion: "latest",
+      sourceType: "module",
+
+      parserOptions: {
+        project: "./tsconfig.json",
+      },
+
+      globals: {
+        ...globals.browser,
+        ...globals.jest,
+      },
+    },
+
+    plugins: {
+      react,
+      "@typescript-eslint": typescriptEslint,
+    },
+
+    extends: compat.extends(
+      "eslint:recommended",
+      "plugin:react/recommended",
+      "plugin:@typescript-eslint/recommended",
+      "prettier",
+    ),
+
+    rules: {
+      "react/react-in-jsx-scope": "off",
+      "@typescript-eslint/no-explicit-any": "off",
+    },
+
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+  },
+  globalIgnores(["**/eslint.config.cjs"]),
+  globalIgnores([
+    "**/node_modules/",
+    "**/dist/",
+    "**/eslint.config.cjs",
+    "**/env.d.ts",
+    "**/vite.config.ts",
+  ]),
+]);