1) you can check all available versions of in package’s Changelog or Versions . for example, checkout all version of flutter_firebase_ui at here https://pub.dev/packages/flutter_firebase_ui/versions. 2) Here you can find all the available packages in flutter.
Read moreHow do you get all the packages in Flutter?
From the terminal: Run flutter pub get . From Android Studio/IntelliJ: Click Packages get in the action ribbon at the top of pubspec. yaml . From VS Code: Click Get Packages located in right side of the action ribbon at the top of pubspec.
Read more