Flutter lower dart version
In the Flutter install directory execute
git checkout v"0.5.0" // for exampleYou can check which versions are available in the Flutter GitHub repository https://github.com/flutter/flutter
You can only change the Dart version if you change to a Flutter version that contains the desired Dart version.
Change the dependency to
dev_dependencies: intl_translations: ^0.17.0
Add following dependency in pubspec.yaml file
version: 1.0.0+1environment: sdk: ">=2.0.0-dev.68.0 <3.0.0"