Migrate ESLint to flat config format properly

eslint.config.js

@@ -0,0 +1,34 @@
+import js from "@eslint/js";
+import astro from "eslint-plugin-astro";
+import typescript from "typescript-eslint";
+
+export default [
+    js.configs.recommended,
+    ...typescript.configs.recommendedTypeChecked,
+    ...typescript.configs.stylisticTypeChecked,
+    {
+        languageOptions: {
+            parserOptions: {
+                project: true,
+                tsconfigRootDir: import.meta.dirname,
+            },
+        },
+    },
+    ...astro.configs.recommended,
+    {
+        ignores: ["node_modules/", ".astro/"],
+    },
+    {
+        rules: {
+            "@typescript-eslint/ban-ts-comment": "off",
+            "@typescript-eslint/no-unsafe-assignment": "off",
+            "@typescript-eslint/no-unsafe-call": "off",
+            "@typescript-eslint/no-unsafe-member-access": "off",
+            "@typescript-eslint/no-unused-vars": "error",
+            "@typescript-eslint/triple-slash-reference": "off",
+            "import/no-anonymous-default-export": "off",
+            "no-console": "warn",
+            "no-control-regex": "off",
+        },
+    },
+];

package.json

@@ -5,10 +5,11 @@
     "scripts": {
         "dev": "astro dev",
         "start": "astro dev",
-        "build": "astro check && astro build",
+        "build": "eslint . && astro build",
         "preview": "astro preview",
         "astro": "astro",
         "format": "prettier --write .",
+        "lint": "eslint .",
         "prepare": "husky"
     },
     "dependencies": {
@@ -19,22 +20,22 @@
         "typescript": "^5.5.2"
     },
     "devDependencies": {
-        "@eslint/eslintrc": "^3.1.0",
         "@eslint/js": "^9.5.0",
         "@fontsource-variable/inter-tight": "^5.0.21",
         "@ianvs/prettier-plugin-sort-imports": "^4.2.1",
-        "@typescript-eslint/eslint-plugin": "^7.14.1",
-        "@typescript-eslint/parser": "^7.14.1",
+        "@types/eslint__js": "^8.42.3",
         "cssnano": "^7.0.3",
         "daisyui": "^4.12.8",
         "eslint": "^9.5.0",
         "eslint-config-prettier": "^9.1.0",
+        "eslint-plugin-astro": "^1.2.2",
         "husky": "^9.0.11",
         "lint-staged": "^15.2.7",
         "prettier": "^3.3.2",
         "prettier-plugin-astro": "^0.14.0",
         "prettier-plugin-sort-json": "^4.0.0",
         "prettier-plugin-tailwindcss": "^0.6.5",
-        "tsc-files": "^1.1.4"
+        "tsc-files": "^1.1.4",
+        "typescript-eslint": "^7.14.1"
     }
 }