Add typescript dev dependency

package.json

@@ -2,7 +2,7 @@
   "name": "ufc-cal",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "src/index.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "start": "npx tsx src/index.ts"
@@ -14,7 +14,8 @@
     "html-entities": "^2.4.0",
     "ics": "^3.4.0",
     "node-html-parser": "^6.1.9",
-    "tsx": "^4.19.2"
+    "tsx": "^4.19.2",
+    "typescript": "^5.7.3"
   },
   "type": "module"
 }