I was trying to run my Flutter app in iOS for the first time, and couldn't run a Debug version on the Simulator. VSC would simply show me that it is building forever, while Activity Monitor showed no CPU activity.
So I tried building it with the command line with
flutter build ios. It would hang too. Googling the issue would get me to posts telling me to delete the ios folder and recreate it with
flutter create .. I did.
Then it told me that the package name "something_something" is an incorrect Dart package. It appears that Dart wants me to use dashes instead of underscores.
After that was done, the build built correctly.