Instale npm install firebase

package.json

@@ -10,6 +10,7 @@
   "dependencies": {
     "expo": "~42.0.1",
     "expo-status-bar": "~1.0.4",
+    "firebase": "^9.0.2",
     "react": "16.13.1",
     "react-dom": "16.13.1",
     "react-native": "https://github.com/expo/react-native/archive/sdk-42.0.0.tar.gz",