ci: add typescript capability and a11y linting

eslint.config.mjs

@@ -1,7 +1,8 @@
 import js from "@eslint/js";
-import { defineConfig } from "eslint/config";
 import eslintPluginAstro from "eslint-plugin-astro";
 import eslintPluginPrettierRecommended from "eslint-plugin-prettier/recommended";
+import { defineConfig } from "eslint/config";
+import jsxA11y from "eslint-plugin-jsx-a11y";
 
 export default defineConfig([
   {
@@ -9,6 +10,12 @@ export default defineConfig([
     plugins: { js },
     extends: ["js/recommended"],
   },
+  {
+    files: ["**/*.{astro,html}"],
+    plugins: {
+      "jsx-a11y": jsxA11y,
+    },
+  },
   ...eslintPluginAstro.configs.recommended,
   eslintPluginPrettierRecommended,
 ]);

package.json

@@ -17,13 +17,16 @@
     "tailwindcss": "^4.2.1"
   },
   "devDependencies": {
+    "@astrojs/ts-plugin": "^1.10.6",
     "@eslint/js": "^10.0.1",
     "@markuplint/astro-parser": "^4.6.23",
     "@markuplint/ml-config": "^4.8.15",
+    "@typescript-eslint/parser": "^8.56.1",
     "cspell": "^9.7.0",
     "eslint": "^10.0.2",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-astro": "^1.6.0",
+    "eslint-plugin-jsx-a11y": "^6.10.2",
     "eslint-plugin-prettier": "^5.5.5",
     "markuplint": "^4.14.1",
     "postcss-html": "^1.8.1",

tsconfig.json

@@ -1,5 +1,9 @@
 {
-  "extends": "astro/tsconfigs/strict",
+  "$schema": "https://json.schemastore.org/tsconfig.json",
+  "extends": "astro/tsconfigs/strictest",
   "include": [".astro/types.d.ts", "**/*"],
-  "exclude": ["dist"]
+  "exclude": ["dist"],
+  "compilerOptions": {
+    "plugins": [{ "name": "@astrojs/ts-plugin" }]
+  }
 }