'JSArray' isn't a type. JSArray<JSString> keyUsages,

[Yoda-Man]

I am now getting this error when i try build.
../../../.pub-cache/hosted/pub.dev/web-1.1.1/lib/src/dom/webcryptoapi.dart:246:5: Error: 'JSArray' isn't a type.
JSArray keyUsages,

[jamiejacksoncumbria]

I am also getting this error message from yesterday as well. Any help would be greatly accepted.

../../AppData/Local/Pub/Cache/hosted/pub.dev/web-1.1.1/lib/src/helpers/cross_origin.dart:134:39: Error: 'JSAny' isn't a type.
static CrossOriginLocation? _create(JSAny? o) {
^^^^^
Unhandled exception:
FileSystemException(uri=org-dartlang-untranslatable-uri:dart%3Ajs_interop; message=StandardFileSystem only supports file:* and data:* URIs)
#0 StandardFileSystem.entityForUri (package:front_end/src/api_prototype/standard_file_system.dart:45)
#1 asFileUri (package:vm/kernel_front_end.dart:984)
#2 writeDepfile (package:vm/kernel_front_end.dart:1147)

#3 FrontendCompiler.compile (package:frontend_server/frontend_server.dart:713)

#4 starter (package:frontend_server/starter.dart:109)

#5 main (file:///C:/b/s/w/ir/x/w/sdk/pkg/frontend_server/bin/frontend_server_starter.dart:13)

[srujzs]

I'm guessing some pub upgrade might have put this in a weird state. Maybe try clearing your pub caches and then do a pub get?

[jamiejacksoncumbria]

Description
When building a Flutter web app with Dart SDK 3.8.1 and web: 1.1.1, I get compilation errors in several files:

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lib/src/helpers/cross_origin.dart:
Error: Extension type member is marked 'external',
but the representation type of its extension type
is not a valid JS interop type.
lib/src/dom/accelerometer.dart:
Error: The representation type 'dynamic' of extension type
'GravitySensor' must be either a subtype of JSObject…
It appears that your extension types are declared with a dynamic or JSAny? representation rather than the required @staticInterop JS interop types (e.g. JSObject, or dart:js_interop classes).

Environment

Dart SDK: 3.8.1

Flutter SDK: 3.32.4

flutter_web_plugins: _implicit via Flutter

web package: 1.1.1

Reproduction

Add web: 1.1.1 to pubspec alongside other dependencies

flutter pub get && flutter build web

Observe errors like above under lib/src/helpers/cross_origin.dart and lib/src/dom/accelerometer.dart

Suggested Fix
In each extension type declaration, ensure the representation type is a valid JS‐interop type (not dynamic or JSAny?). For example, in cross_origin.dart:

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• extension type CrossOriginLocation._(JSAny? o) implements JSObject { … }

• @staticInterop
• extension type CrossOriginLocation._(JSObject o) implements JSObject { … }
  And in accelerometer.dart:

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• extension type GravitySensor._(dynamic _) implements Sensor, JSObject { … }

• @staticInterop
• extension type GravitySensor._(JSObject _) implements Sensor, JSObject { … }
  You may need to import package:js_interop/js_interop.dart or use the new @staticInterop pattern per the Dart 3.0 interop guide.

Once the extension types’ representation types are corrected, the build should succeed under Dart 3.8+/Flutter web.

Thank you! Let me know if you need any more logs or testing.