URL: https://pub.dartlang.org/packages/webdev#-installing-tab- `webdev` has no libraries to use. It does have an executable defined in `pubspec.yaml`, though. Consider adding `pub global activate` instructions for such packages. See also https://pub.dartlang.org/packages/peanut https://pub.dartlang.org/packages/pubviz https://pub.dartlang.org/packages/stagehand