Add Bun and TypeScript configuration.

package.json

@@ -0,0 +1,21 @@
+{
+  "type": "module",
+  "devDependencies": {
+    "@bauke/eslint-config": "^0.1.5",
+    "@bauke/prettier-config": "^0.1.5",
+    "@types/bun": "^1.0.8",
+    "astro": "^4.4.9",
+    "sass": "^1.71.1",
+    "typescript": "^5.3.3",
+    "xo": "^0.57.0"
+  },
+  "prettier": "@bauke/prettier-config",
+  "xo": {
+    "extends": "@bauke/eslint-config",
+    "prettier": true,
+    "rules": {
+      "unicorn/prevent-abbreviations": "off"
+    },
+    "space": true
+  }
+}

tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "allowImportingTsExtensions": true,
+    "allowJs": true,
+    "jsx": "react-jsx",
+    "lib": ["ES2022"],
+    "module": "ES2022",
+    "moduleDetection": "force",
+    "moduleResolution": "bundler",
+    "noEmit": true,
+    "noFallthroughCasesInSwitch": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "ES2022",
+    "verbatimModuleSyntax": true
+  }
+}