TypeError: dart.global.firebase.firestore is not a function

[mrmayurgithub]

TypeError: dart.global.firebase.firestore is not a function
at Object.getFirestoreInstance (http://localhost:36109/packages/cloud_firestore_web/src/interop/utils/utils.dart.lib.js:997:79)
at new cloud_firestore_web.FirebaseFirestoreWeb.new (http://localhost:36109/packages/cloud_firestore_web/src/write_batch_web.dart.lib.js:863:37)
at Function.registerWith (http://localhost:36109/packages/cloud_firestore_web/src/write_batch_web.dart.lib.js:745:73)
at Object.registerPlugins (http://localhost:36109/packages/opinionx/generated_plugin_registrant.dart.lib.js:19:46)
at main (http://localhost:36109/web_entrypoint.dart.lib.js:29:35)
at main.next ()
at runBody (http://localhost:36109/dart_sdk.js:37976:34)
at Object._async [as async] (http://localhost:36109/dart_sdk.js:38007:7)
at main$ (http://localhost:36109/web_entrypoint.dart.lib.js:28:18)
at http://localhost:36109/main_module.bootstrap.js:20:10
at Array.forEach ()
at window.$dartRunMain (http://localhost:36109/main_module.bootstrap.js:19:32)
at :1:8
at Object.runMain (http://localhost:36109/dwds/src/injected/client.js:8685:21)
at http://localhost:36109/dwds/src/injected/client.js:22076:19
at _wrapJsFunctionForAsync_closure.$protected (http://localhost:36109/dwds/src/injected/client.js:3826:15)
at _wrapJsFunctionForAsync_closure.call$2 (http://localhost:36109/dwds/src/injected/client.js:10919:12)
at Object._asyncStartSync (http://localhost:36109/dwds/src/injected/client.js:3790:20)
at main__closure1.$call$body$main__closure (http://localhost:36109/dwds/src/injected/client.js:22088:16)
at main__closure1.call$1 (http://localhost:36109/dwds/src/injected/client.js:22015:19)
at StaticClosure._rootRunUnary [as call$2$5] (http://localhost:36109/dwds/src/injected/client.js:4150:16)
at _CustomZone.runUnary$2$2 (http://localhost:36109/dwds/src/injected/client.js:12150:39)
at _CustomZone.runUnaryGuarded$1$2 (http://localhost:36109/dwds/src/injected/client.js:12082:14)
at _ControllerSubscription._sendData$1 (http://localhost:36109/dwds/src/injected/client.js:11711:19)
at _DelayedData.perform$1 (http://localhost:36109/dwds/src/injected/client.js:11863:59)
at _PendingEvents_schedule_closure.call$0 (http://localhost:36109/dwds/src/injected/client.js:11912:14)
at Object._microtaskLoop (http://localhost:36109/dwds/src/injected/client.js:3986:24)
at StaticClosure._startMicrotaskLoop (http://localhost:36109/dwds/src/injected/client.js:3992:11)
at _AsyncRun__initializeScheduleImmediate_internalCallback.call$1 (http://localhost:36109/dwds/src/injected/client.js:10788:9)
at invokeClosure (http://localhost:36109/dwds/src/injected/client.js:1238:26)
at MutationObserver. (http://localhost:36109/dwds/src/injected/client.js:1257:18)

In pubspec.yaml, I have used -
cloud_firestore: ^0.16.0
firebase_auth: ^0.20.0+1
firebase_core: ^0.7.0

In index.html -

<script src="/__/firebase/8.2.3/firebase-app.js"></script> <script src="https://www.gstatic.com/firebasejs/7.14.4/firebase-app.js"></script> <script src="https://www.gstatic.com/firebasejs/7.14.4/firebase-auth.js"></script>

[mrmayurgithub]

I made some changes index.html -

<script src="https://www.gstatic.com/firebasejs/8.2.4/firebase-app.js"></script> <script src="https://www.gstatic.com/firebasejs/8.2.4/firebase-firestore.js"></script>

In pubspec.yaml, I have used -
cloud_firestore: ^0.16.0
firebase_auth: ^0.20.0+1
firebase_core: ^0.7.0

Everything worked fine.