fix(lib): fixed ts version

Author: AnthonyNahas

package-lock.json

@@ -82,7 +82,7 @@
     "ts-loader": "^6.2.2",
     "ts-node": "~8.6.2",
     "tslint": "~6.1.0",
-    "typescript": "^4.2.4",
+    "typescript": "4.0.7",
     "webpack-cli": "^3.3.12"
   },
   "prettier": {