moved to multi-file, added some comments

package.json

@@ -8,9 +8,15 @@
   },
   "license": "SEE LICENSE IN LICENSE",
   "author": "Oscar Giacalone",
-  "type": "commonjs",
+  "type": "module",
   "main": "index.js",
   "scripts": {
+    "dev": "vite",
+	"build": "vite build",
     "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "dependencies": {
+    "pdf-lib": "^1.17.1",
+    "vite": "^8.3.2"
   }
 }