Fix for deprecation and added index.d.ts file for module declaration

Author: kanhaiya

package.json

@@ -39,7 +39,7 @@
     "eslint-plugin-jsx-a11y": "^6.2.1",
     "eslint-plugin-prettier": "^3.1.1",
     "eslint-plugin-react": "^7.16.0",
-    "mocha": "^7.1.1",
+    "mocha": "^6.2.2",
     "prettier": "^1.17.0"
   },
   "directories": {