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    Flutter Webで起動時の「FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created」

    flutter run -d chrome --web-port=3333 起動したら

    Launching lib/main.dart on Chrome in debug mode...
    Syncing files to device Chrome...
    18,176ms (!)
    Debug service listening on ws://127.0.0.1:63619/ToXsKu5dYro=
    
    Warning: Flutter's support for web development is not stable yet and hasn't
    been thoroughly tested in production environments.
    For more information see https://flutter.dev/web
    
    🔥  To hot restart changes while running, press "r". To hot restart (and refresh
    the browser), press "R".
    For a more detailed help message, press "h". To quit, press "q".
    FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - call
    Firebase App.initializeApp() (app/no-app).
        at Object.p [as app]
        (https://www.gstatic.com/firebasejs/7.5.0/firebase-app.js:1:10100)
        at Object.app$ [as app]
        (http://localhost:3333/packages/firebase/src/top_level.dart.lib.js:72:56)
        at new cloud_firestore_web.FirestoreWeb.new
        (http://localhost:3333/packages/cloud_firestore_web/src/write_batch_web.dart
        .lib.js:793:57)
        at Function.registerWith
        (http://localhost:3333/packages/cloud_firestore_web/src/write_batch_web.dart
        .lib.js:738:71)
        at Object.registerPlugins
        (http://localhost:3333/packages/admin/generated_plugin_registrant.dart.lib.j
        s:15:38)
        at main$ (http://localhost:3333/web_entrypoint.dart.lib.js:15:35)
        at main$.next (<anonymous>)
        at runBody (http://localhost:3333/dart_sdk.js:35674:34)
        at Object._async [as async] (http://localhost:3333/dart_sdk.js:35702:7)
        at main$ (http://localhost:3333/web_entrypoint.dart.lib.js:14:18)
        at <anonymous>:1:8
        at Object.runMain
        (http://localhost:3333/dwds/src/injected/client.js:8343:15)
        at http://localhost:3333/dwds/src/injected/client.js:22335:19
        at _wrapJsFunctionForAsync_closure.$protected
        (http://localhost:3333/dwds/src/injected/client.js:3636:15)
        at _wrapJsFunctionForAsync_closure.call$2
        (http://localhost:3333/dwds/src/injected/client.js:10848:12)
        at Object._asyncStartSync
        (http://localhost:3333/dwds/src/injected/client.js:3600:20)
        at main__closure1.$call$body$main__closure
        (http://localhost:3333/dwds/src/injected/client.js:22347:16)
        at main__closure1.call$1
        (http://localhost:3333/dwds/src/injected/client.js:22279:19)
        at StaticClosure._rootRunUnary [as call$2$5]
        (http://localhost:3333/dwds/src/injected/client.js:3958:16)
        at _CustomZone.runUnary$2$2
        (http://localhost:3333/dwds/src/injected/client.js:12164:39)
        at _CustomZone.runUnaryGuarded$1$2
        (http://localhost:3333/dwds/src/injected/client.js:12092:14)
        at _ControllerSubscription._sendData$1
        (http://localhost:3333/dwds/src/injected/client.js:11642:19)
        at _DelayedData.perform$1
        (http://localhost:3333/dwds/src/injected/client.js:11796:59)
        at _PendingEvents_schedule_closure.call$0
        (http://localhost:3333/dwds/src/injected/client.js:11845:14)
        at Object._microtaskLoop
        (http://localhost:3333/dwds/src/injected/client.js:3801:21)
        at StaticClosure._startMicrotaskLoop
        (http://localhost:3333/dwds/src/injected/client.js:3807:11)
        at _AsyncRun__initializeScheduleImmediate_internalCallback.call$1
        (http://localhost:3333/dwds/src/injected/client.js:10720:9)
        at invokeClosure (http://localhost:3333/dwds/src/injected/client.js:1172:26)
        at MutationObserver.<anonymous>
        (http://localhost:3333/dwds/src/injected/client.js:1191:18)

    「FirebaseError: Firebase: No Firebase App '[DEFAULT]' has been created - call Firebase App.initializeApp() (app/no-app).」のやつ

    No Firebase App '[DEFAULT]' has been created の対応 - Qiita

    Reactでも出てくるっぽい。

    Flutter WebではDartでじゃ無くて web/index.htmlへ書く?