General improvements

package.json

@@ -8,6 +8,10 @@
     "@fortawesome/react-fontawesome": "^0.2.0",
     "@noble/secp256k1": "^1.7.0",
     "@reduxjs/toolkit": "^1.9.1",
+    "@types/jest": "^29.2.5",
+    "@types/node": "^18.11.18",
+    "@types/react": "^18.0.26",
+    "@types/react-dom": "^18.0.10",
     "bech32": "^2.0.0",
     "light-bolt11-decoder": "^2.1.0",
     "qr-code-styling": "^1.6.0-rc.1",
@@ -18,6 +22,7 @@
     "react-router-dom": "^6.5.0",
     "react-scripts": "5.0.1",
     "react-twitter-embed": "^4.0.4",
+    "typescript": "^4.9.4",
     "uuid": "^9.0.0"
   },
   "scripts": {