Extension type function not available about language

[jakemac53]

Is this file for sure under the package in which you set the new SDK constraint? Language versions are per package.

You can also check your .dart_tool/package_config.json file, search for the name of the package containing this file, and see what language version it has. If you see something other than 3.3 then the pub get didn't properly overwrite this file and I would try it again.

[Soliardi-Chyngyz]

Наверно ли этот файл находится в пакете, в котором вы установили новое ограничение SDK? Языковые версии указаны для каждого пакета.

Вы также можете проверить свой .dart_tool/package_config.jsonфайл, найти имя пакета, содержащего этот файл, и посмотреть, какая у него языковая версия. Если вы видите что-то иное 3.3, то паб не перезаписал этот файл должным образом, и я попробую еще раз.

As I understand it, we are talking about this line of json code:

{
"name": "packageName",
"rootUri": "../",
"packageUri": "lib/",
"languageVersion": "3.3"
}

[jakemac53]

As I understand it, we are talking about this line of json code:

Correct, and it looks like you are definitely >3.1. Have you tried restarting the analysis server in your IDE? You shouldn't have to, but maybe it didn't pick up the change somehow. In VsCode you can do Ctrl+shift+p and then type "restart analysis server" and run that action. I am not sure how it is done in intellij.

[jakemac53]

I am also curious if you get the same error from flutter run or if it is only an IDE analysis issue.

[Soliardi-Chyngyz]

Мне также интересно, получаете ли вы ту же ошибку flutter runили это только проблема анализа IDE.

Yes I'm getting an error
The current Dart SDK version is 3.1.3.
Because package requires SDK version >=3.3.0 <4.0.0, version solving failed.

[Soliardi-Chyngyz]

restart analysis server

I tried this method but nothing, it’s possible that the fvm third-party lib somehow influences this
maybe I should just do a flutter upgrade?

[jakemac53]

You could do a flutter upgrade - or just change your SDK constraint to >=3.1.0 <4.0.0 - 3.1 looks like the version this feature was released in.

[Soliardi-Chyngyz]

Thank you, the question is most likely not for you but for fvm
flutter upgrade solved the problem but in my case it does not work My Mac does not support Xcode 15 as required by the latest version of flutter