The top-level pub command is scheduled for deprecation in favor of dart pub.

We added dart pub in version 2.10.0, so it might still be necessary to call pub get for some older versions of the Dart SDK.
However, we plan to insert a deprecation warning in the top-level pub command, in Dart 2.12.0 (next stable release of the Dart SDK). Hence, to avoid users experiencing a deprecation warning in pub get output, it would be preferable to migrate to dart pub get now.

See also: dart-lang/pub#2736