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balvinderz / video_player_web_hls

Supports hls on chrome and other browsers.
BSD 3-Clause "New" or "Revised" License
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TypeError: Cannot read properties of undefined (reading 'isSupported') on Flutter Web #50

Open Bilalgamal96 opened 9 months ago

Bilalgamal96 commented 9 months ago

I am trying to initialize the VideoPlayerController in Flutter Web but everytime I load the screen it ends up with this error TypeError: Cannot read properties of undefined (reading 'isSupported').

Note: I tried different browsers and I got the same error in all of them.

Packages I use in Pubspec.yaml file: video_player: ^2.7.1 video_player_web_hls: ^1.1.0

Here is how I initialize the controller:

//Code
_VideoPlayerController = VideoPlayerController.networkUrl(Uri.parse(streamUrl))..initialize().
          then((_) {
            print("initialized");
            // Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.

            _controller!.play();
            setState(() {});
          }).onError((error, stackTrace) {
            print("====================================================");
            print(error);

            setState(() {});
          });
//End of code

Actual Result:


TypeError: Cannot read properties of undefined (reading 'isSupported')
packages/video_player_web_hls/src/video_player.dart 331:66                        shouldUseHlsLibrary
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5                _async
packages/video_player_web_hls/src/video_player.dart 329:35                        shouldUseHlsLibrary
packages/video_player_web_hls/src/video_player.dart 83:15                         initialize
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5                _async
packages/video_player_web_hls/src/video_player.dart 72:26                         initialize
packages/video_player_web_hls/video_player_web_hls.dart 97:17                     create
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5                _async
packages/video_player_web_hls/video_player_web_hls.dart 50:21                     create
packages/video_player/video_player.dart 426:46                                    initialize
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 84:54                runBody
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 123:5                _async
packages/video_player/video_player.dart 380:26                                    initialize
packages/.dart 34:65          <fn>
packages/.dart 35:22          initState
packages/flutter/src/widgets/framework.dart 5219:55                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6435:14                               mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5068:5                                [_firstBuild]
packages/flutter/src/widgets/framework.dart 5242:11                               [_firstBuild]
packages/flutter/src/widgets/framework.dart 5062:5                                mount
packages/flutter/src/widgets/framework.dart 3971:15                               inflateWidget
packages/flutter/src/widgets/framework.dart 6570:36                               inflateWidget
packages/flutter/src/widgets/framework.dart 3708:18                               updateChild
packages/flutter/src/widgets/framework.dart 6153:32                               updateChildren
packages/flutter/src/widgets/framework.dart 6595:17                               update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5274:5                                update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5417:5                                update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5417:5                                update
packages/flutter/src/widgets/inherited_notifier.dart 107:11                       update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5274:5                                update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5417:5                                update
packages/flutter/src/widgets/inherited_notifier.dart 107:11                       update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5274:5                                update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5274:5                                update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 6442:14                               update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 6442:14                               update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 5417:5                                update
packages/flutter/src/widgets/framework.dart 3686:14                               updateChild
packages/flutter/src/widgets/framework.dart 5111:16                               performRebuild
packages/flutter/src/widgets/framework.dart 5251:11                               performRebuild
packages/flutter/src/widgets/framework.dart 4805:7                                rebuild
packages/flutter/src/widgets/framework.dart 2780:18                               buildScope
packages/flutter/src/widgets/binding.dart 903:9                                   drawFrame
packages/flutter/src/rendering/binding.dart 358:5                                 [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart 1284:15                               [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart 1214:9                                handleDrawFrame
packages/flutter/src/scheduler/binding.dart 1072:5                                [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1236:13                               invoke
lib/_engine/engine/platform_dispatcher.dart 244:5                                 invokeOnDrawFrame
lib/_engine/engine/initialization.dart 190:45                                     <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 367:37  _checkAndCall
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 372:39  dcall
loadeded
====================================================
TypeError: Cannot read properties of undefined (reading 'isSupported')

Flutter Doctor Output:

[✓] Flutter (Channel stable, 3.10.6, on Ubuntu 22.04.3 LTS 6.2.0-32-generic, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[✓] Chrome - develop for the web
[✓] Linux toolchain - develop for Linux desktop
[✓] Android Studio (version 2021.2)
[✓] VS Code (version 1.82.2)
[✓] Connected device (2 available)
[✓] Network resources
realwld commented 9 months ago

same issue

djtsov commented 6 months ago

Add in index.html as that has been writtent in documentaion.

busslina commented 1 month ago

Add in index.html as that has been writtent in documentaion.

Is like a trap. Everybody falling there. Myself too hehe.

Anyway, that instruction maybe has to be updated because I don't see this on my index.html:

<script src="main.dart.js" type="application/javascript"></script>

The closest thing I see is this:

<script>
    window.addEventListener('load', function(ev) {
      // Download main.dart.js
      _flutter.loader.loadEntrypoint({
        serviceWorker: {
          serviceWorkerVersion: serviceWorkerVersion,
        },
        onEntrypointLoaded: function(engineInitializer) {
          engineInitializer.initializeEngine().then(function(appRunner) {
            appRunner.runApp();
          });
        }
      });
    });
  </script>