chore: add unified ESLint config for TS, Astro, and JSX

- Introduce eslint.config.js with flat‑config structure
- Enable TypeScript linting using @typescript-eslint parser and plugin
- Add Astro parser/plugin with recommended rules
- Configure React/Preact JSX linting including react-hooks rules
- Apply project-aware parserOptions for TypeScript

eslint.config.js

@@ -0,0 +1,64 @@
+// eslint.config.js
+import js from "@eslint/js";
+import tseslint from "@typescript-eslint/eslint-plugin";
+import tsParser from "@typescript-eslint/parser";
+import astroPlugin from "eslint-plugin-astro";
+import astroParser from "astro-eslint-parser";
+import reactPlugin from "eslint-plugin-react";
+import reactHooks from "eslint-plugin-react-hooks";
+
+export default [
+  js.configs.recommended,
+
+  // TypeScript
+  {
+    files: ["**/*.ts", "**/*.tsx"],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        project: "./tsconfig.json",
+      },
+    },
+    plugins: {
+      "@typescript-eslint": tseslint,
+    },
+    rules: {
+      ...tseslint.configs.recommended.rules,
+    },
+  },
+
+  // Astro
+  {
+    files: ["**/*.astro"],
+    languageOptions: {
+      parser: astroParser,
+      parserOptions: {
+        parser: tsParser,
+      },
+    },
+    plugins: {
+      astro: astroPlugin,
+    },
+    rules: {
+      ...astroPlugin.configs.recommended.rules,
+    },
+  },
+
+  // JSX / Preact
+  {
+    files: ["**/*.jsx", "**/*.tsx"],
+    plugins: {
+      react: reactPlugin,
+      "react-hooks": reactHooks,
+    },
+    rules: {
+      ...reactPlugin.configs.recommended.rules,
+      ...reactHooks.configs.recommended.rules,
+    },
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+  },
+];

package.json

@@ -9,12 +9,22 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/preact": "^4.0.10",
-    "@astrojs/rss": "^4.0.11",
+    "@astrojs/preact": "^4.1.3",
+    "@astrojs/rss": "^4.0.14",
     "astro": "^5.7.5",
-    "preact": "^10.25.4"
+    "preact": "^10.28.0"
   },
   "devDependencies": {
-    "typescript": "^5.7.3"
+    "@astrojs/language-server": "^2.16.2",
+    "@astrojs/ts-plugin": "^1.10.6",
+    "typescript": "^5.9.3",
+    "typescript-language-server": "^5.1.3",
+    "@typescript-eslint/parser": "^8.0.0",
+    "@typescript-eslint/eslint-plugin": "^8.0.0",
+    "eslint-plugin-react": "^7.35.0",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-astro": "^1.5.0",
+    "astro-eslint-parser": "^1.2.2",
+    "vscode-langservers-extracted": "^4.10.0"
   }
 }

tsconfig.json

@@ -12,5 +12,8 @@
     "jsxImportSource": "preact",
     "strictNullChecks": true,
     "allowJs": true
-  }
+  },
+  "plugins": [
+    { "name": "@astrojs/ts-plugin" }
+  ]
 }